Rule2025-14781

Medicare Program; FY 2026 Inpatient Psychiatric Facilities Prospective Payment System-Rate Update

Primary source

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Published
August 5, 2025
Effective
October 1, 2025

Issuing agencies

Health and Human Services DepartmentCenters for Medicare & Medicaid Services

Abstract

This final rule updates the prospective payment rates, the outlier threshold, and the wage index for Medicare inpatient hospital services provided by Inpatient Psychiatric Facilities (IPFs), which include psychiatric hospitals and excluded psychiatric units of an acute care hospital or critical access hospital. This final rule also revises the payment adjustment factors for teaching status and for IPFs located in rural areas. These changes will be effective for IPF discharges occurring during the fiscal year beginning October 1, 2025, through September 30, 2026. We are finalizing changes to measures used in the Inpatient Psychiatric Facilities Quality Reporting (IPFQR) Program, updating and codifying the Extraordinary Circumstances Exception policy, and summarizing comments received through requests for information regarding future changes to the IPFQR Program.

Full Text

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<title>Federal Register, Volume 90 Issue 148 (Tuesday, August 5, 2025)</title>
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[Federal Register Volume 90, Number 148 (Tuesday, August 5, 2025)]
[Rules and Regulations]
[Pages 37628-37676]
From the Federal Register Online via the Government Publishing Office [<a href="http://www.gpo.gov">www.gpo.gov</a>]
[FR Doc No: 2025-14781]



[[Page 37627]]

Vol. 90

Tuesday,

No. 148

August 5, 2025

Part II





Department of Health and Human Services





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Centers for Medicare & Medicaid Services





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42 CFR Part 412





Medicare Program; FY 2026 Inpatient Psychiatric Facilities Prospective 
Payment System--Rate Update; Final Rule

Federal Register / Vol. 90, No. 148 / Tuesday, August 5, 2025 / Rules 
and Regulations

[[Page 37628]]


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DEPARTMENT OF HEALTH AND HUMAN SERVICES

Centers for Medicare & Medicaid Services

42 CFR Part 412

[CMS-1831-F]
RIN 0938-AV46


Medicare Program; FY 2026 Inpatient Psychiatric Facilities 
Prospective Payment System--Rate Update

AGENCY: Centers for Medicare & Medicaid Services (CMS), Department of 
Health and Human Services (HHS).

ACTION: Final rule.

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SUMMARY: This final rule updates the prospective payment rates, the 
outlier threshold, and the wage index for Medicare inpatient hospital 
services provided by Inpatient Psychiatric Facilities (IPFs), which 
include psychiatric hospitals and excluded psychiatric units of an 
acute care hospital or critical access hospital. This final rule also 
revises the payment adjustment factors for teaching status and for IPFs 
located in rural areas. These changes will be effective for IPF 
discharges occurring during the fiscal year beginning October 1, 2025, 
through September 30, 2026. We are finalizing changes to measures used 
in the Inpatient Psychiatric Facilities Quality Reporting (IPFQR) 
Program, updating and codifying the Extraordinary Circumstances 
Exception policy, and summarizing comments received through requests 
for information regarding future changes to the IPFQR Program.

DATES: These regulations are effective October 1, 2025.

FOR FURTHER INFORMATION CONTACT: 
    The IPF Payment Policy mailbox at <a href="/cdn-cgi/l/email-protection#d990899f89b8a0b4bcb7ad89b6b5b0baa099bab4aaf7b1b1aaf7beb6af"><span class="__cf_email__" data-cfemail="b9f0e9ffe9d8c0d4dcd7cde9d6d5d0dac0f9dad4ca97d1d1ca97ded6cf">[email&#160;protected]</span></a> for 
general information. Nick Brock, (410) 786-5148, for information 
regarding the inpatient psychiatric facilities prospective payment 
system (IPF PPS) and regulatory impact analysis. Kaleigh Emerson, 
<a href="/cdn-cgi/l/email-protection#bdd6dcd1d8d4dad593d8d0d8cfced2d38cfdded0ce93d5d5ce93dad2cb"><span class="__cf_email__" data-cfemail="caa1aba6afa3ada2e4afa7afb8b9a5a4fb8aa9a7b9e4a2a2b9e4ada5bc">[email&#160;protected]</span></a>, for information regarding the Inpatient 
Psychiatric Facilities Quality Reporting (IPFQR) Program.

SUPPLEMENTARY INFORMATION:

Availability of Certain Tables Exclusively Through the Internet on the 
CMS Website

    Addendum A to this final rule summarizes the fiscal year (FY) 2026 
IPF PPS payment rates, outlier threshold, cost of living adjustment 
factors (COLA) for Alaska and Hawaii, national and upper limit cost-to-
charge ratios, and adjustment factors. In addition, Addendum B to this 
final rule shows the complete listing of ICD-10 Clinical Modification 
(CM) and Procedure Coding System (PCS) codes, the FY 2026 IPF PPS 
comorbidity adjustment, and electroconvulsive therapy (ECT) procedure 
codes. Addenda A and B to this final rule are available on the CMS 
website at <a href="https://www.cms.gov/medicare/payment/prospective-payment-systems/inpatient-psychiatric-facility/tools-and-worksheets">https://www.cms.gov/medicare/payment/prospective-payment-systems/inpatient-psychiatric-facility/tools-and-worksheets</a>.
    Tables setting forth the FY 2026 Wage Index for Urban Areas Based 
on Core Based Statistical Area (CBSA) Labor Market Areas, the FY 2026 
Wage Index Based on CBSA Labor Market Areas for Rural Areas, and the FY 
2026 CBSA Labor Market Areas are available exclusively through the 
internet, on the CMS website at <a href="https://www.cms.gov/medicare/payment/prospective-payment-systems/inpatient-psychiatric-facility/wage-index">https://www.cms.gov/medicare/payment/prospective-payment-systems/inpatient-psychiatric-facility/wage-index</a>.

I. Executive Summary

A. Purpose

    This final rule updates the prospective payment rates, the outlier 
threshold, and the wage index for Medicare inpatient hospital services 
provided by Inpatient Psychiatric Facilities (IPFs) for discharges 
occurring during fiscal year (FY) 2026, (beginning October 1, 2025, 
through September 30, 2026). This rule also revises the payment 
adjustment factors for teaching status and for IPFs located in rural 
areas. Lastly, this final rule modifies a quality measure, removes four 
quality measures, and updates and codifies the Extraordinary 
Circumstances Exception (ECE) policy under the Inpatient Psychiatric 
Facilities Quality Reporting (IPFQR) Program.

B. Summary of the Major Provisions

1. Inpatient Psychiatric Facilities Prospective Payment System (IPF 
PPS)
    For the IPF PPS, we are finalizing our proposals to:
    <bullet> Revise the facility-level IPF PPS adjustment factors for 
teaching status and for IPFs located in rural areas.
    <bullet> Make technical rate setting updates: The IPF PPS payment 
rates will be adjusted annually for input price inflation, as well as 
statutory and other policy factors.
    This rule updates:
    ++ The IPF PPS Federal per diem base rate from $876.53 to $892.87.
    ++ The IPF PPS Federal per diem base rate for providers who failed 
to report quality data to $875.44.
    ++ The electroconvulsive therapy (ECT) payment per treatment from 
$661.52 to $673.85.
    ++ The ECT payment per treatment for providers who failed to report 
quality data to $660.70.
    ++ The labor-related share from 78.8 percent to 79.0 percent.
    ++ The wage index budget neutrality factor to 1.0011. This final 
rule applies a refinement standardization factor of 0.9927.
    ++ The fixed dollar loss threshold amount from $38,110 to $39,360, 
to maintain estimated outlier payments at 2 percent of total estimated 
aggregate IPF PPS payments.
2. Inpatient Psychiatric Facilities Quality Reporting (IPFQR) Program
    For the Inpatient Psychiatric Facilities Quality Reporting (IPFQR) 
Program, we are finalizing our proposals to modify the reporting period 
of the 30-Day Risk-Standardized All Cause Emergency Department (ED) 
Visit Following an IPF Discharge measure, remove the Facility 
Commitment to Health Equity measure, remove the COVID-19 Vaccination 
Coverage Among Healthcare Personnel (HCP) measure, remove the Screening 
for Social Drivers of Health and Screen Positive Rate for Social 
Drivers of Health measures, and update and codify changes to the 
Extraordinary Circumstances Exception (ECE) policy. In addition, we are 
summarizing comments received on three topics through requests for 
information on a potential future star rating system for IPFs, future 
measure concepts for the IPFQR Program, and on using the Fast 
Healthcare Interoperability Resources[supreg] (FHIR[supreg]) standard 
for electronic exchange of healthcare information for patient 
assessment reporting.

C. Summary of Impacts

------------------------------------------------------------------------
                                              Total transfers & cost
         Provision description                      reductions
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FY 2026 IPF PPS payment update.........  The overall economic impact of
                                          this final rule is an
                                          estimated $70 million in
                                          increased payments to IPFs
                                          during FY 2026.

[[Page 37629]]

 
IPFQR Program update, including measure  We estimate a cost reduction of
 removals.                                $1,746,474 ($1,731,712 in CY
                                          2026 and a further $14,761 in
                                          CY 2027) for facilities and
                                          patients due to the policies
                                          we are finalizing for the
                                          IPFQR Program.
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II. Background

A. Overview of the Legislative Requirements of the IPF PPS

    Section 124 of the Medicare, Medicaid, and State Children's Health 
Insurance Program Balanced Budget Refinement Act of 1999 (BBRA) (Pub. 
L. 106-113) required the establishment and implementation of an IPF PPS 
in a budget neutral manner. Specifically, section 124 of the BBRA 
mandated that the Secretary of Health and Human Services (the 
Secretary) develop a per diem prospective payment system (PPS) for 
inpatient hospital services furnished in psychiatric hospitals and 
excluded psychiatric units including an adequate patient classification 
system that reflects the differences in patient resource use and costs 
among psychiatric hospitals and excluded psychiatric units. ``Excluded 
psychiatric unit'' means a psychiatric unit of an acute care hospital 
or of a Critical Access Hospital (CAH), which is excluded from payment 
under the Inpatient Prospective Payment System (IPPS) or CAH payment 
system, respectively. These excluded psychiatric units will be paid 
under the IPF PPS.
    Section 405(g)(2) of the Medicare Prescription Drug, Improvement, 
and Modernization Act of 2003 (MMA) (Pub. L. 108-173) extended the IPF 
PPS to psychiatric distinct part units of CAHs.
    Sections 3401(f) and 10322 of the Patient Protection and Affordable 
Care Act (Pub. L. 111-148) as amended by section 10319(e) of that Act 
and by section 1105(d) of the Health Care and Education Reconciliation 
Act of 2010 (Pub. L. 111-152) (hereafter referred to jointly as ``the 
Affordable Care Act'') added subsection (s) to section 1886 of the 
Social Security Act (the Act).
    Section 1886(s)(1) of the Act titled ``Reference to Establishment 
and Implementation of System,'' refers to section 124 of the BBRA, 
which relates to the establishment of the IPF PPS.
    Section 1886(s)(2)(A)(i) of the Act requires the application of the 
productivity adjustment described in section 1886(b)(3)(B)(xi)(II) of 
the Act to the IPF PPS for the rate year (RY) beginning in 2012 (that 
is, a RY that coincides with a FY) and each subsequent RY.
    Section 1886(s)(2)(A)(ii) of the Act required the application of an 
``other adjustment'' that reduced any update to an IPF PPS base rate by 
a percentage point amount specified in section 1886(s)(3) of the Act 
for the RY beginning in 2010 through the RY beginning in 2019. As noted 
in the FY 2020 IPF PPS final rule (84 FR 38424), for the RY beginning 
in 2019, section 1886(s)(3)(E) of the Act required that the other 
adjustment reduction be equal to 0.75 percentage point; that was the 
final year the statute required the application of this adjustment. 
Because FY 2021 was a RY beginning in 2020, FY 2021 was the first year 
that section 1886(s)(2)(A)(ii) of the Act did not apply since its 
enactment.
    Sections 1886(s)(4)(A) through (D) of the Act require that for RY 
2014 and each subsequent RY, IPFs that fail to report required quality 
data with respect to such a RY will have their annual update to a 
standard Federal rate for discharges reduced by 2.0 percentage points. 
This may result in an annual update being less than 0.0 for a RY, and 
may result in payment rates for the upcoming RY being less than such 
payment rates for the preceding RY. Any reduction for failure to report 
required quality data will apply only to the RY involved, and the 
Secretary will not consider such reduction in computing the payment 
amount for a subsequent RY. Additional information about the specifics 
of the current IPFQR Program is available in the FY 2020 IPF PPS final 
rule (84 FR 38459 through 38468).
    Section 4125 of the Consolidated Appropriations Act, 2023 (CAA, 
2023) (Pub. L. 117-328), which amended section 1886(s) of the Act, 
requires CMS to revise the Medicare prospective payment system for 
psychiatric hospitals and psychiatric units. Specifically, section 
4125(a) of the CAA, 2023 added section 1886(s)(5)(A) of the Act to 
require the Secretary to collect data and information, as the Secretary 
determines appropriate, to revise payments under the IPF PPS. CMS 
discussed this data collection in the FY 2024 IPF PPS final rule (88 FR 
51054), as CMS was required to begin collecting this data and 
information not later than October 1, 2023. As discussed in that rule, 
the agency has already been collecting data and information consistent 
with the types set forth in the CAA, 2023 as part of our extensive and 
years-long analyses and consideration of potential payment system 
refinements. We refer readers to the FY 2024 IPF PPS final rule (88 FR 
51095 through 51098) where we discussed existing data collection and 
requested information to inform future IPF PPS revisions.
    In addition, section 1886(s)(5)(D) of the Act, as added by section 
4125(a) of the CAA, 2023 required that the Secretary implement 
revisions to the methodology for determining the payment rates under 
the IPF PPS for psychiatric hospitals and psychiatric units, effective 
for RY 2025 (FY 2025). Section 1886(s)(5)(D) of the Act provided that 
these revisions may be based on a review of the data and information 
collected under section 1886(s)(5)(A) of the Act. For a detailed 
discussion on the revisions implemented for FY 2025, we refer readers 
to the FY 2025 IPF PPS final rule (89 FR 64590 through 64636).
    Section 4125(b) of the CAA, 2023 amended section 1886(s)(4) of the 
Act by inserting a new subparagraph (E) and redesignating the existing 
subparagraph (E) as subparagraph (F) which requires IPFs participating 
in the IPFQR Program to collect and submit to the Secretary 
standardized patient assessment data, using a standardized patient 
assessment instrument, for RY 2028 (FY 2028) and each subsequent rate 
year. IPFs must submit such data with respect to at least the admission 
and discharge of an individual, or more frequently as the Secretary 
determines appropriate. For IPFs to meet this new data collection and 
reporting requirement for RY 2028 and each subsequent rate year, the 
Secretary must implement a standardized patient assessment instrument 
that collects data with respect to the following categories: functional 
status; cognitive function and mental status; special services, 
treatments, and interventions; medical conditions and comorbidities; 
impairments; and other categories as determined appropriate by the 
Secretary. This patient assessment instrument must enable comparison of 
such patient assessment data that IPFs submit across all such IPFs to 
which such data are applicable.
    Section 4125(b) of the CAA, 2023 further amended section 1886(s) of 
the Act by adding a new subparagraph (6) that requires the Secretary to 
implement revisions to the methodology for determining the payment 
rates for

[[Page 37630]]

psychiatric hospitals and psychiatric units (that is, payment rates 
under the IPF PPS), effective for RY 2031 (FY 2031), as the Secretary 
determines to be appropriate, to take into account the patient 
assessment data described in paragraph (4)(E)(ii).
    To implement and periodically update the IPF PPS, we have published 
various proposed and final rules and notices in the Federal Register. 
For more information regarding these documents, we refer readers to the 
CMS website at <a href="https://www.cms.gov/Medicare/Medicare-Fee-for-Service-Payment/InpatientPsychFacilPPS/index.html">https://www.cms.gov/Medicare/Medicare-Fee-for-Service-Payment/InpatientPsychFacilPPS/index.html</a>?redirect=/
InpatientPsychFacilPPS/.

B. Overview of the IPF PPS

    We issued the rate year (RY) 2005 IPF PPS final rule that appeared 
in the November 15, 2004 Federal Register (69 FR 66922). The RY 2005 
IPF PPS final rule established the IPF PPS, as required by section 124 
of the BBRA and codified at 42 CFR part 412, subpart N. The RY 2005 IPF 
PPS final rule set forth the Federal per diem base rate for the 
implementation year (the 18-month period from January 1, 2005, through 
June 30, 2006) and provided payment for the inpatient operating and 
capital costs to IPFs for covered psychiatric services they furnish 
(that is, routine, ancillary, and capital costs, but not costs of 
approved educational activities, bad debts, and other services or items 
that are outside the scope of the IPF PPS). Covered psychiatric 
services include services for which benefits are provided under the 
fee-for-service Part A (Hospital Insurance Program) of the Medicare 
program.
    The IPF PPS established the Federal per diem base rate for each 
patient day in an IPF derived from the national average daily routine 
operating, ancillary, and capital costs in IPFs in FY 2002. The average 
per diem cost was updated to the midpoint of the first year under the 
IPF PPS, standardized to account for the overall positive effects of 
the IPF PPS payment adjustments, and adjusted for budget neutrality.
    The Federal per diem payment under the IPF PPS is comprised of the 
Federal per diem base rate described previously and certain patient- 
and facility-level payment adjustments for characteristics that were 
found in the regression analysis to be associated with statistically 
significant per diem cost differences, with statistical significance 
defined as p less than 0.05. A complete discussion of the regression 
analysis that established the IPF PPS adjustment factors can be found 
in the RY 2005 IPF PPS final rule (69 FR 66933 through 66936).
    The patient-level adjustments include age, Diagnosis-Related Group 
(DRG) assignment, and comorbidities, as well as adjustments to reflect 
higher per diem costs at the beginning of a patient's IPF stay and 
lower costs for later days of the stay. Facility-level adjustments 
include adjustments for the IPF's wage index, rural location, teaching 
status, a cost-of-living adjustment for IPFs located in Alaska and 
Hawaii, and an adjustment for the presence of a qualifying emergency 
department (ED).
    The IPF PPS provides additional payment policies for outlier cases, 
interrupted stays, and a per-treatment payment for patients who undergo 
ECT. During the IPF PPS mandatory 3-year transition period, stop-loss 
payments were also provided; however, since the transition ended as of 
January 1, 2008, these payments are no longer available.

C. Annual Requirements for Updating the IPF PPS

    Section 124 of the BBRA did not specify an annual rate update 
strategy for the IPF PPS and was broadly written to give the Secretary 
discretion in establishing an update methodology. Therefore, in the RY 
2005 IPF PPS final rule, we implemented the IPF PPS using the following 
update strategy:
    <bullet> Calculate the final Federal per diem base rate to be 
budget neutral for the 18-month period of January 1, 2005, through June 
30, 2006.
    <bullet> Use a July 1 through June 30 annual update cycle.
    <bullet> Allow the IPF PPS first update to be effective for 
discharges on or after July 1, 2006, through June 30, 2007.
    The RY 2005 final rule (69 FR 66922) implemented the IPF PPS. In 
developing the IPF PPS, and to ensure that the IPF PPS can account 
adequately for each IPF's case-mix, we performed an extensive 
regression analysis of the relationship between the per diem costs and 
certain patient and facility characteristics to determine those 
characteristics associated with statistically significant cost 
differences on a per diem basis. That regression analysis is described 
in detail in our RY 2004 IPF proposed rule (68 FR 66923; 66928 through 
66933) and our RY 2005 IPF final rule (69 FR 66933 through 66960). For 
characteristics with statistically significant cost differences, we 
used the regression coefficients of those variables to determine the 
size of the corresponding payment adjustments.
    In the RY 2005 IPF final rule, we explained the reasons for 
delaying an update to the adjustment factors, derived from the 
regression analysis, including waiting until we have IPF PPS data that 
yields as much information as possible regarding the patient-level 
characteristics of the population that each IPF serves. We indicated 
that we did not intend to update the regression analysis and the 
patient-level and facility-level adjustments until we complete that 
analysis. Until that analysis is complete, we stated our intention to 
publish a notice in the Federal Register each spring to update the IPF 
PPS (69 FR 66966).
    We issued a final rule which appeared in the May 6, 2011 Federal 
Register titled, ``Inpatient Psychiatric Facilities Prospective Payment 
System--Update for Rate Year Beginning July 1, 2011 (RY 2012)'' (76 FR 
26432), which changed the payment rate update period to a RY that 
coincides with a FY update. Therefore, final rules are now published in 
the Federal Register in the summer to be effective on October 1st of 
each year. When proposing changes in IPF payment policy, a proposed 
rule is issued in the spring, and the final rule in the summer to be 
effective on October 1st. For a detailed list of updates to the IPF 
PPS, we refer readers to our regulations at 42 CFR 412.428. Beginning 
October 1, 2012, we finalized that we would refer to the 12-month 
period from October 1 through September 30 as a ``fiscal year'' (FY) 
rather than a RY (76 FR 26435). Therefore, in this final rule we refer 
to rules that took effect after RY 2012 by the FY, rather than the RY, 
in which they took effect.
    The most recent IPF PPS annual update, the FY 2025 IPF PPS final 
rule (89 FR 64582), appeared in the Federal Register on August 7, 2024. 
The FY 2025 IPF PPS final rule updated the patient-level adjustments 
and the ED adjustment as well as increased the ECT per treatment 
payment amount for FY 2025, in accordance with section 1886(s)(5)(D)(i) 
of the Act. That final rule also updated the IPF PPS Federal per diem 
base rates that were published in the FY 2024 IPF PPS final rule (88 FR 
51054). In revising the IPF PPS patient-level adjustment factors, and 
to ensure that the IPF PPS can account adequately for each IPF's case-
mix, we performed an extensive regression analysis of the relationship 
between the per diem costs and patient characteristics to determine 
those characteristics associated with statistically significant cost 
differences on a per diem basis. That regression analysis is described 
in detail in our FY 2025 IPF PPS proposed rule (89 FR 23154 through 
23161) and our FY 2025 IPF PPS final rule (89 FR 64594 through

[[Page 37631]]

64601). For characteristics with statistically significant cost 
differences, we used the regression coefficients of those variables to 
determine the size of the corresponding payment adjustments.
    As required by section 1886(s)(5)(D)(iii) of the Act, revisions to 
the IPF PPS payment rates implemented pursuant to section 
1886(s)(5)(D)(i) of the Act must be budget neutral. Therefore, we 
finalized a refinement standardization factor for the FY 2025 IPF PPS 
payment rates to maintain budget neutrality for FY 2025. The 
application of the FY 2025 standardization factor is described in 
detail in our FY 2025 IPF PPS proposed rule (89 FR 23194) and our FY 
2025 IPF PPS final rule (89 FR 64640 and 64641).

III. Analysis of and Responses to the Public Comments

    We received 55 public comments that pertain to proposed IPF PPS 
payment policies, requests for information, and the proposed updates to 
the IPFQR Program. Comments were from inpatient psychiatric facilities, 
health systems, national and state level provider and patient advocacy 
organizations, health information technology providers, and 
individuals. We reviewed each comment and grouped related comments, 
after which we placed them in categories based on subject matter or 
section(s) of the regulation affected. Summaries of the public comments 
received and our responses to those comments are provided in the 
appropriate sections in the preamble of this final rule.
    In addition, we received a few comments that were out of the scope 
of the FY 2026 IPF PPS proposed rule. We appreciate these comments but 
note that, because they fall outside the scope of this rulemaking, we 
do not address them in this rule. We may consider these comments as we 
continue to develop policies for future rulemaking, as applicable.

IV. Provisions of the FY 2026 IPF PPS Final Rule and Responses to 
Comments

A. FY 2026 Market Basket Increase and Productivity Adjustment for the 
IPF PPS

1. Background
    Originally, the input price index used to develop the IPF PPS was 
the Excluded Hospital with Capital market basket. This market basket 
was based on 1997 Medicare cost reports for Medicare-participating 
inpatient rehabilitation facilities (IRFs), IPFs, long-term care 
hospitals (LTCHs), cancer hospitals, and children's hospitals. Although 
``market basket'' technically describes the mix of goods and services 
used in providing health care at a given point in time, this term is 
also commonly used to denote the input price index (that is, cost 
category weights and price proxies) derived from that market basket. 
Accordingly, the term ``market basket,'' as used in this document, 
refers to an input price index.
    Since the IPF PPS inception, the market basket used to update IPF 
PPS payments has been rebased and revised to reflect more recent data 
on IPF cost structures. We last rebased and revised the IPF market 
basket in the FY 2024 IPF PPS rule, where we adopted a 2021-based IPF 
market basket, using Medicare cost report data for both Medicare 
participating freestanding psychiatric hospitals and psychiatric units. 
We refer readers to the FY 2024 IPF PPS final rule for a detailed 
discussion of the 2021-based IPF market basket and its development (88 
FR 51057 through 51081). Prior to the 2021-based IPF market basket, we 
used the 2016-based IPF market basket that was adopted in the FY 2020 
IPF PPS final rule (84 FR 38426 through 38447). References to the 
historical market baskets used to update IPF PPS payments prior to the 
FY 2020 IPF PPS rule are listed in the FY 2016 IPF PPS final rule (80 
FR 46656).
2. FY 2026 IPF Market Basket Update
    For FY 2026 (beginning October 1, 2025, and ending September 30, 
2026), we proposed to update the IPF PPS payments by a market basket 
increase factor, with a productivity adjustment as required by section 
1886(s)(2)(A)(i) of the Act. Consistent with historical practice, we 
proposed to estimate the market basket update for the IPF PPS based on 
the most recent forecast available at the time of rulemaking from IHS 
Global Inc. (IGI).\1\ IGI is a nationally recognized economic and 
financial forecasting firm with which CMS contracts to forecast the 
components of the market baskets and productivity adjustment. For the 
proposed rule, based on IGI's fourth quarter 2024 forecast with 
historical data through the third quarter of 2024, the proposed 2021-
based IPF market basket increase factor for FY 2026 was 3.2 percent. We 
also proposed that if more recent data became available after the 
publication of the proposed rule and before the publication of this 
final rule (for example, a more recent estimate of the market basket 
percentage increase or productivity adjustment), we would use such 
data, if appropriate, to determine the FY 2026 IPF market basket update 
in this final rule.
---------------------------------------------------------------------------

    \1\ <a href="https://www.spglobal.com/en">https://www.spglobal.com/en</a>.
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    Section 1886(s)(2)(A)(i) of the Act requires that, after 
establishing the increase factor for a FY, the Secretary shall reduce 
such increase factor for FY 2012 and each subsequent FY, by the 
productivity adjustment described in section 1886(b)(3)(B)(xi)(II) of 
the Act. Section 1886(b)(3)(B)(xi)(II) of the Act sets forth the 
definition of this productivity adjustment. The statute defines the 
productivity adjustment to be equal to the 10-year moving average of 
changes in annual economy-wide, private nonfarm business multifactor 
productivity (MFP) (as projected by the Secretary for the 10-year 
period ending with the applicable FY, year, cost reporting period, or 
other annual period) (the ``productivity adjustment''). The United 
States Department of Labor's Bureau of Labor Statistics (BLS) publishes 
the official measures of productivity for the U.S. economy. We note 
that previously the productivity measure referenced in section 
1886(b)(3)(B)(xi)(II) of the Act was published by BLS as private 
nonfarm business MFP. Beginning with the November 18, 2021, release of 
productivity data, BLS replaced the term ``multifactor productivity'' 
with ``total factor productivity'' (TFP). BLS noted that this is a 
change in terminology only and will not affect the data or methodology. 
As a result of the BLS name change, the productivity measure referenced 
in section 1886(b)(3)(B)(xi)(II) of the Act is now published by BLS as 
private nonfarm business TFP. However, as mentioned previously, the 
data and methods are unchanged. We refer readers to <a href="http://www.bls.gov">www.bls.gov</a> for the 
BLS historical published TFP data. A complete description of IGI's TFP 
projection methodology is available on the CMS website at <a href="https://www.cms.gov/data-research/statistics-trends-and-reports/medicare-program-rates-statistics/market-basket-research-and-information">https://www.cms.gov/data-research/statistics-trends-and-reports/medicare-program-rates-statistics/market-basket-research-and-information</a>. In 
addition, in the FY 2022 IPF PPS final rule (86 FR 42611), we noted 
that effective with FY 2022 and forward, CMS changed the name of this 
adjustment to refer to it as the productivity adjustment rather than 
the MFP adjustment.
    Section 1886(s)(2)(A)(i) of the Act requires the application of the 
productivity adjustment described in section 1886(b)(3)(B)(xi)(II) of 
the Act to the IPF PPS for the RY beginning in 2012 (a RY that 
coincides with a FY) and each subsequent RY. For the FY 2026 IPF PPS 
proposed rule, based on IGI's fourth quarter 2024 forecast, the 
proposed productivity adjustment for

[[Page 37632]]

FY 2026 (the 10-year moving average change of TFP for the period ending 
FY 2026) was projected to be 0.8 percentage point. Accordingly, we 
proposed to reduce the proposed 3.2 percent IPF market basket increase 
by the proposed 0.8 percentage point productivity adjustment, as 
mandated by the Act. This resulted in a proposed FY 2026 IPF PPS 
payment rate update of 2.4 percent (3.2 percent-0.8 percentage point = 
2.4 percent). We also proposed that if more recent data became 
available, we would use such data, if appropriate, to determine the FY 
2026 IPF market basket increase and productivity adjustment for the 
final rule.
    We solicited comments on the proposed IPF market basket increase 
and productivity adjustment for FY 2026. The following is a summary of 
the comments we received and our responses.
    Comment: Several commenters expressed appreciation for the FY 2026 
IPF payment update; however, some commenters stated that the proposed 
payment update is inadequate to address the current cost pressures IPFs 
are facing. A commenter highlighted that from 2022 to 2024, general 
inflation rose by 14.1 percent while Medicare IPF payment rates 
increased only 5.1 percent, effectively creating a payment cut in real 
terms. Another commenter provided data showing that hospital employee 
compensation grew by 45 percent from 2014 to 2023, while IPF PPS 
updates provided only a 23.5 percent increase during the same period. 
Commenters explained that this has created an unsustainable financial 
environment where Medicare payments have consistently failed to keep 
pace with the actual cost of caring for patients.
    Commenters stated that workforce shortages and escalating labor 
costs represent the most significant challenge facing IPFs, with labor 
constituting approximately 80 percent of the IPF PPS market basket 
according to CMS data. A commenter reported that advertised salaries 
for registered nurses have grown 26.6 percent faster than the rate of 
inflation over the past 4 years, while hospitals have been forced to 
dramatically increase wages, bonuses, and contract labor rates to 
maintain critical staffing. A couple of commenters stated that rural 
facilities face particularly acute challenges because their IPFs rely 
heavily on traveling clinicians and contract staff due to severe 
workforce shortages in underserved areas. This commenter stated that 
rural facilities also face higher per-patient infrastructure costs due 
to lower patient volumes, limited access to community-based 
alternatives that result in longer patient stays, and transportation 
barriers that require additional investment in discharge planning and 
patient support services. Several commenters stated that IPFs are 
facing significant increases in pharmaceutical and supply costs that 
further strain their operating budgets, citing a Department of Health 
and Human Services report showing that prices for nearly 2,000 drugs 
increased an average of 15.2 percent from 2017 through 2023, notably 
faster than general inflation. The commenters indicated that drug 
shortages have compounded these challenges, with medications commonly 
used in psychiatric care--including clonazepam, oxazepam, and 
ketamine--experiencing supply disruptions that force facilities to seek 
more expensive alternatives and disrupt patient care protocols.
    A commenter stated the IPF market basket is flawed due to CMS's use 
of the Employment Cost Index (ECI) to measure changes in labor 
compensation in the market basket. The commenter stated that the ECI 
might not fully capture growth in employment and labor costs, as it 
does not account for changes driven by shifts between different 
categories of labor such as between staff and contract employees.
    Several commenters stated that the inadequate payment update 
threatens the long-term sustainability of inpatient psychiatric 
services and could force facilities to reduce capacity or close 
altogether. A commenter added that Medicare Advantage is having even 
further negative impacts on IPFs by reimbursing for IPF services at 
rates below cost. The commenter explained that since their patient mix 
is close to 50 percent covered by Medicare fee-for-service (FFS) and 
Medicare Advantage, they are less able to mitigate losses by increasing 
rates on commercial payors to offset those losses. Commenters urged CMS 
to adopt a higher market basket update that reflects the true cost of 
providing inpatient psychiatric care in the current economic 
environment noting that the Medicare Advantage plans have a forecasted 
increase for 2026 of about 5 percent. Several organizations 
specifically requested that CMS utilize more recent cost data in 
developing the final rule.
    Response: We appreciate the commenters' concern regarding 
inflationary pressure facing IPFs and the proposed FY 2026 market 
basket update. As stated in the FY 2024 IPF final rule (88 FR 541057) 
and FY 2025 IPF final rule (89 FR 64586), the 2021-based IPF market 
basket is a fixed-weight, Laspeyres-type index that measures price 
changes over time. Since the inception of the IPF PPS, the IPF payment 
rates (with the exception of statutorily-mandated updates) have been 
updated by a projection of a market basket percentage increase--
consistent with other CMS PPS updates (including IPPS, SNF, and HH). 
The market basket is designed to measure price inflation for IPF 
providers and would not reflect increases in costs associated with 
changes in the volume or intensity of input goods and services (such as 
the quantity of labor used).
    Additionally, we acknowledge that the market basket updates may 
differ from other overall inflation indexes such as the topline CPI; 
however, we would reiterate that these topline indexes are not 
comparable since they measure different mixes of products, services, or 
wages than the IPF market basket. Additionally, the market basket 
updates appropriately differ from other payment updates (such as 
projected increase in the average per capita payments to Medicare 
Advantage organizations) that are not consistent in concept with the 
statutory requirement as they would reflect anticipated volume and 
intensity of services.
    As is our general practice, we proposed in the FY 2026 IPF proposed 
rule that if more recent data became available, we would use such data, 
if appropriate, to derive the final FY 2026 IPF market basket update 
for the final rule. The projection of the 2021-based IPF market basket 
is based on the most recent forecast from IGI--a nationally recognized 
economic and financial forecasting firm with which we contract to 
forecast the price proxies of the market baskets. We also note that 
when developing its forecast for labor prices, IGI considers overall 
labor market conditions (including rise in contract labor employment 
due to tight labor market conditions) as well as trends in contract 
labor wages, which both have an impact on wage pressures for workers 
employed directly by the hospital.
    For this final rule, based on the more recent IGI second quarter 
2025 forecast with historical data through the first quarter of 2025, 
the projected 2021-based IPF market basket increase factor for FY 2026 
is 3.2 percent, which is unchanged from the projected FY 2026 market 
basket increase factor in the proposed rule. We note that while there 
are multiple offsetting factors contributing to differences in the 
forecasts underlying the proposed and final rules, the final FY 2026 
productivity-adjusted IPF market basket

[[Page 37633]]

update is slightly higher due to economic uncertainty.
    We rebased and revised the IPF market basket in the FY 2024 IPF 
final rule (88 FR 51057) and did not receive any comments related to 
the use of the ECIs in the IPF market basket. We continue to believe 
the ECI is an appropriate index to measure the price changes for 
Compensation costs. While the ECI reflects the price changes for 
employed staff only, we believe those price changes accurately reflect 
the labor price trends for those occupations, regardless of whether 
they are employed or contracted staff. Additionally, separating the 
compensation category by occupation enables us to capture any cost 
weight changes associated with employing versus contracting labor when 
the index weights are updated. We will continue to monitor the trends 
in the ECI as well as the increased use of contract labor. We welcome 
any additional publicly available data that commenters can provide 
regarding alternative price indexes.
    Comment: Several commenters expressed concerns regarding the 
ongoing application of the productivity adjustment to IPFs. The 
commenters highlighted that CMS identified a lag in hospital 
productivity compared to the BLS estimate of private nonfarm business 
productivity growth. Commenters stated that under these circumstances, 
expecting an increase in IPF productivity in FY 2026 is unreasonable.
    A commenter further expressed concerns with the mandated 
productivity adjustment by stating that private nonfarm business TFP 
productivity measures are unsuitable for hospitals. They stated that 
while TFP outputs in private businesses are based on quantities and 
prices of goods/services, hospital outputs, such as visit/procedure 
volumes, reflect community disease burdens rather than productivity. 
Additionally, the commenter explained that hospitals cannot adjust 
their prices like private businesses due to fixed reimbursements and 
negotiated rates with insurers. This commenter also stated that TFP 
does not account for the unique challenges faced by hospitals, 
including unpredictable patient volumes, rising costs, varying acuity 
levels, and regulatory burdens unfamiliar to other industries. Finally, 
commenters stated that hospital services are labor-intensive, making 
sustained productivity gains difficult. Commenters explained that, 
similar to education and social assistance sectors, hospitals have 
lower productivity rates. Commenters further noted that CMS recognizes 
hospitals achieve only one-third of the productivity gains of the 
private sector, citing a June 2022 memorandum from CMS. This memo 
stated that ``over the period 1990-2019, the average growth rate of 
hospital [productivity] using the two methodologies ranges from 0.2 
percent to 0.5 percent, compared to the average growth of private 
nonfarm business [productivity] of 0.8 percent.'' \2\ The memo also 
indicated that an assumed future rate of hospital industry productivity 
growth of 0.4 percent per year remained reasonable compared to an 
assumed productivity growth rate in the private nonfarm business sector 
of 1.0 percent.
---------------------------------------------------------------------------

    \2\ Paul Spitalnic, Stephen Heffler, Bridget Dickensheets and 
Mollie Knight, ``Hospital Multifactor Productivity: An Update 
Presentation of Two Methodologies Using Data through 2019.'' 
(<a href="http://cms.gov">cms.gov</a>).
---------------------------------------------------------------------------

    A commenter questioned the increase of the FY 2026 productivity cut 
to 0.8 percent from 0.5 percent in FY 2025 despite being based on a 10-
year moving average, which should smooth out fluctuations. They 
mentioned an inability to fully analyze projections due to CMS's lack 
of transparency but suggested that excluding a low-TFP growth period in 
2016 from the updated 10-year moving average may unjustifiably increase 
the productivity adjustment. The commenter also claimed that the 
productivity adjustment is only applied if it reduces Medicare 
payments, never to increase them. They provided an example from FY 
2021, where a -0.1 percent productivity factor forecast would have 
raised the hospital market basket by 0.1 percentage point, but CMS set 
it at 0, citing a mandate to reduce, not increase, the market basket 
percentage increase based on productivity changes. This practice leads 
to cumulative yearly reductions and asymmetric treatment of 
productivity declines, resulting in underfunding for hospitals.
    Several commenters acknowledged the Affordable Care Act's 
requirement for the productivity adjustment but requested CMS use its 
``special exceptions and adjustments'' authority to eliminate or modify 
the productivity adjustment for FY 2026. Some commenters requested that 
CMS carefully monitor the impact of these productivity adjustments on 
the IPF hospital sector, provide feedback to Congress as appropriate, 
and reduce the productivity adjustment.
    Response: Section 1886(s)(2)(A)(i) of the Act requires the 
application of the productivity adjustment described in section 
1886(b)(3)(B)(xi)(II) to the IPF PPS market basket update. As required 
by statute, the FY 2026 productivity adjustment is derived based on the 
10-year moving average growth in economy-wide private nonfarm business 
total factor productivity for the period ending FY 2026. We recognize 
the concerns of the commenters regarding the appropriateness of the 
productivity adjustment; however, we are required pursuant to section 
1886(b)(3)(B)(xi)(II) of the Act to apply the specific productivity 
adjustment described here.
    We have always made available on the CMS website the general method 
for calculating the productivity adjustment. This includes providing a 
link to the most recent BLS historical TFP data (<a href="https://www.bls.gov/productivity/">https://www.bls.gov/productivity/</a>), which allows interested parties to obtain historical 
TFP annual index levels for 1987 through 2024. We also provided the IGI 
projection model (<a href="https://www.cms.gov/research-statistics-data-and-systems/statistics-trends-and-reports/medicareprogramratesstats/downloads/tfp_methodology.pdf">https://www.cms.gov/research-statistics-data-and-systems/statistics-trends-and-reports/medicareprogramratesstats/downloads/tfp_methodology.pdf</a>), which is used to derive annual TFP 
growth rates for 2025 and 2026. The annual index level derived from 
this method is then interpolated to quarterly levels, and the FY 2026 
productivity adjustment is equal to the percent change in the 40-
quarter moving average projected level for the period ending September 
30, 2026, relative to the 40-quarter moving average projected level for 
the period ending September 30, 2025. We believe our methodology for 
the productivity adjustment is consistent with section 
1886(b)(3)(B)(xi)(II) of the Act, which states that the productivity 
adjustment is equal to the 10-year moving average of changes in annual 
economy-wide private nonfarm business multi-factor productivity (as 
projected by the Secretary for the 10-year period ending with the 
applicable fiscal year, year, cost reporting period, or other annual 
period), which is used to derive annual TFP growth rates for 2025 and 
2026. The annual index level derived from this method is then 
interpolated to quarterly levels, and the FY 2026 productivity 
adjustment is equal to the percent change in the 40-quarter moving 
average projected level for the period ending September 30, 2026, 
relative to the 40-quarter moving average projected level for the 
period ending September 30, 2025.
    At the time of this final rule, the FY 2026 productivity adjustment 
reflects BLS historical TFP data through 2024 (released on March 21, 
2025) and IGI's forecasted TFP growth for 2025 and 2026. The average 
annual growth rate of historical TFP published by BLS for 2017 through 
2024 is currently 0.9 percent and IGI is projecting average

[[Page 37634]]

TFP growth of about 0.0 percent for 2025 and 2026 based on IGI's 
second-quarter 2025 forecast. Combining the historical and projected 
TFP data over the entire 10-year time period results in a compound 
annual growth rate of TFP of 0.7 percent for 2026. The productivity 
adjustment (based on the 10-year period ending FY 2026) for this final 
rule is 0.1 percentage point lower than in the proposed rule and 
primarily reflects the incorporation of a revised outlook from IGI that 
has lower projected economic growth over 2025 and 2026. The 0.7 
percentage point productivity adjustment in the FY 2026 final rule is 
larger than the productivity adjustment in prior final rules for FY 
2023 and FY 2024 mainly due to the incorporation of updated BLS 
historical data.
    In response to commenters' concerns about the productivity 
adjustment only being applied if it reduces the payment update, we note 
that the productivity adjustment was established under the Affordable 
Care Act with a specific policy intent to encourage efficiency 
improvements in healthcare delivery by linking Medicare payment updates 
to economy-wide productivity gains. The statutory language in section 
1886(s)(2)(A) of the Act requires that the Secretary reduce (not 
increase) the market basket percentage increase by changes in economy-
wide productivity, therefore, only positive productivity adjustments 
are applied.
    Comment: Several commenters noted concerns about CMS's estimation 
of the IPF market basket updates since the COVID-19 PHE, stating that 
it has resulted in several consecutive years of underpayments to IPF 
providers, with data showing that market basket updates for fiscal 
years 2021 through 2024 have understated the IPF base rate by 4.2 to 
5.1 percentage points. The commenters stated that the pattern of 
forecast errors stems directly from economic disruption caused by the 
COVID-19 PHE, which created inflationary pressures that existing 
forecasting models failed to capture, representing a departure from 
historically more balanced forecasting performance. Some commenters 
stated that these under forecasts are built into the IPF base payment 
and because future updates are based on current payment levels, missed 
forecasts become permanently established in standard payment rates and 
continue to compound over time, creating an ever-widening gap between 
actual costs and reimbursement levels that disadvantages IPFs and 
inhibits their ability to address behavioral health needs in their 
communities. Several commenters urged CMS to take corrective measures 
including one-time adjustments ranging from 3.6 to 4.2 percentage 
points to account for cumulative forecast errors and requested that CMS 
use special exceptions and adjustments authority to eliminate 
productivity cuts and implement base rate corrections that would 
provide IPFs with stability needed to maintain access to patient care 
despite ongoing financial challenges.
    Response: We appreciate the concerns of commenters; however, we did 
not propose and are not finalizing a forecast error adjustment for the 
IPF PPS for FY 2026. The IPF market basket updates are set 
prospectively, which means that the update relies on a mix of both 
historical data for part of the period for which the update is 
calculated and forecasted data for the remainder. For instance, the FY 
2026 market basket update in this final rule reflects historical data 
through the first quarter of CY 2025 and forecasted data through the 
third quarter of CY 2026.
    While there is no precedent to adjust for market basket forecast 
error in the IPF payment update, a forecast error can be calculated by 
comparing the actual market basket increase for a given year less than 
the forecasted market basket increase. Due to the uncertainty regarding 
future price trends, forecast errors can be both positive and negative. 
The forecast error has been both positive and negative during past 
years, and over longer periods of time the cumulative forecast has not 
deviated significantly from the historical measures. Only considering 
the forecast error for years when the IPF market basket update was 
lower than the actual market basket update does not consider the full 
experience and impact of forecast error.
    Final Decision: After consideration of the comments received, we 
are finalizing our proposal to update IPF PPS payment rates using the 
latest available productivity-adjusted market basket increase factor. 
Based on IGI's second quarter 2025 forecast, the 2021-based IPF market 
basket percentage increase for FY 2026 is 3.2 percent and the projected 
FY 2026 productivity adjustment is 0.7 percentage point. Therefore, the 
final FY 2026 IPF market basket update is equal to 2.5 percent (3.2 
percent market basket percentage increase reduced by the 0.7 percentage 
point productivity adjustment).
3. FY 2026 IPF Labor-Related Share
    Due to variations in geographic wage levels and other labor-related 
costs, we believe that payment rates under the IPF PPS should continue 
to be adjusted by a geographic wage index, which will apply to the 
labor-related portion of the Federal per diem base rate (hereafter 
referred to as the ``labor-related share''). The labor-related share is 
determined by identifying the national average proportion of total 
costs that are related to, influenced by, or vary with the local labor 
market. We proposed to continue to classify a cost category as labor-
related if the costs are labor-intensive and vary with the local labor 
market.
    Based on our definition of the labor-related share and the cost 
categories in the 2021-based IPF market basket, we proposed to continue 
to include in the labor-related share the sum of the relative 
importance of Wages and Salaries; Employee Benefits; Professional Fees: 
Labor-Related; Administrative and Facilities Support Services; 
Installation, Maintenance, and Repair Services; All Other: Labor-
Related Services; and a portion of the Capital-Related relative 
importance from the 2021-based IPF market basket. For more details 
regarding the methodology for determining specific cost categories for 
inclusion in the labor-related share based on the 2021-based IPF market 
basket, we refer readers to the FY 2024 IPF PPS final rule (88 FR 51078 
through 51081).
    The relative importance reflects the different rates of price 
change for these cost categories between the base year (FY 2021) and FY 
2026. Based on IGI's fourth quarter 2024 forecast of the 2021-based IPF 
market basket, the sum of the FY 2026 relative importance moving 
average of Wages and Salaries; Employee Benefits; Professional Fees: 
Labor-Related; Administrative and Facilities Support Services; 
Installation, Maintenance, and Repair Services; All Other: Labor-
Related Services is 75.8 percent. We proposed, consistent with prior 
rulemaking, that the portion of Capital-Related costs that are 
influenced by the local labor market is 46 percent. Since the relative 
importance for Capital-Related costs is 6.7 percent of the 2021-based 
IPF market basket for FY 2026, we proposed to take 46 percent of 6.7 
percent to determine a labor-related share of Capital-Related costs for 
FY 2026 of 3.1 percent. Therefore, we proposed a total labor-related 
share for FY 2026 of 78.9 percent (the sum of 75.8 percent for the 
labor-related share of operating costs and 3.1 percent for the labor-
related share of Capital-Related costs). We also proposed that if more 
recent data became available, we would use such data, if appropriate, 
to determine the FY 2026 labor-related share for the final rule. For 
more information on the labor-related share and its calculation, we 
refer readers to the FY 2024 IPF PPS final rule (88 FR 51078 through 
51081).

[[Page 37635]]

    We solicited comments on the proposed labor-related share for FY 
2026. The following is a summary of the comments we received and our 
responses.
    Comment: A commenter expressed support for the proposed increase in 
the labor-related share for FY 2026. They also stated that CMS should 
consider a shorter period than 5 years for the next rebasing and 
revising of the IPF market basket and revision to the standard payment 
conversion factor labor share since the current labor share is based on 
FY 2021 cost reports and may not fully reflect the increase weight of 
labor in the overall index that hospitals experienced due to the COVID-
19 PHE and labor shortages.
    Response: We appreciate the commenter's support for the FY 2026 IPF 
labor-related share. We proposed to use the FY 2026 relative importance 
values for the labor-related cost categories from the 2021-based IPF 
market basket because it accounts for more recent data regarding price 
pressures and cost structure of IPFs. This methodology is consistent 
with the determination of the labor-related share since the 
implementation of the IPF PPS. As stated in the FY 2026 IPF proposed 
rule, we also proposed that if more recent data became available, we 
would use such data, if appropriate, to determine the FY 2026 labor-
related share for the final rule. Based on IGI's second quarter 2025 
forecast with historical data through the first quarter of 2025, the FY 
2026 labor-related share for the final rule is 79.0 percent, which is 
0.1 percentage point higher than the proposed rule.
    We appreciate the commenter's request for us to consider a shorter 
period than 5 years for the next rebasing. We generally rebase the IPF 
market basket every 5 years, in part because the cost weights obtained 
from the Medicare cost reports did not indicate much of a change in the 
weights over shorter intervals. However, we recognize the commenter's 
concern and the potential impact of the PHE on the cost weights. 
Therefore, we have been regularly monitoring the Medicare cost report 
data to assess whether a rebasing is technically appropriate, and we 
will continue to do so in the future. As done historically, a rebasing 
of the IPF market basket would be proposed in rulemaking and subject to 
public comments.
    Final Decision: After consideration of the comments, we are 
finalizing a FY 2026 labor-related share based on the latest available 
data. Based on IGI's second quarter 2025 forecast of the 2021-based IPF 
market basket, the sum of the FY 2026 relative importance moving 
average of Wages and Salaries; Employee Benefits; Professional Fees: 
Labor-Related; Administrative and Facilities Support Services; 
Installation, Maintenance, and Repair Services; All Other: Labor-
Related Services is 75.9 percent. Since the relative importance for 
Capital-Related costs is 6.7 percent of the 2021-based IPF market 
basket for FY 2026, we take 46 percent of 6.7 percent to determine a 
labor-related share of Capital-Related costs for FY 2026 of 3.1 
percent. Therefore, the total labor-related share for FY 2026 is 79.0 
percent (the sum of 75.9 percent for the labor-related share of 
operating costs and 3.1 percent for the labor-related share of Capital-
Related costs).
    Table 1 shows the final FY 2026 labor-related share and the final 
FY 2025 labor-related share using the 2021-based IPF market basket 
relative importance.

               Table 1--FY 2026 Final IPF Labor-Related Share and FY 2025 IPF Labor-Related Share
----------------------------------------------------------------------------------------------------------------
                                                                     Relative importance,   Relative importance,
                                                                     labor-related share    labor-related share
                                                                         FY 2025 \1\            FY 2026 \2\
----------------------------------------------------------------------------------------------------------------
Wages and Salaries................................................                   53.6                   53.7
Employee Benefits.................................................                   14.1                   14.2
Professional Fees: Labor-Related..................................                    4.7                    4.7
Administrative and Facilities Support Services....................                    0.6                    0.6
Installation, Maintenance and Repair Services.....................                    1.2                    1.2
All Other Labor-Related Services..................................                    1.5                    1.5
                                                                   ---------------------------------------------
    Subtotal......................................................                   75.7                   75.9
                                                                   ---------------------------------------------
Labor-related portion of Capital-Related (.46)....................                    3.1                    3.1
                                                                   ---------------------------------------------
        Total Labor-Related Share.................................                   78.8                   79.0
----------------------------------------------------------------------------------------------------------------
\1\ Based on the 2nd quarter 2024 IGI forecast of the 2021-based IPF market basket.
\2\ Based on the 2nd quarter 2025 IGI forecast of the 2021-based IPF market basket.

B. Updates to the IPF PPS Rates for FY Beginning October 1, 2025

    The IPF PPS is based on a standardized Federal per diem base rate 
calculated from the IPF average per diem costs and adjusted for budget 
neutrality in the implementation year. The Federal per diem base rate 
is used as the standard payment per day under the IPF PPS and is 
adjusted by the patient-level and facility-level adjustments that are 
applicable to the IPF stay. A detailed explanation of how we calculated 
the average per diem cost appears in the RY 2005 IPF PPS final rule (69 
FR 66926).
1. Determining the Standardized Budget Neutral Federal Per Diem Base 
Rate
    Section 124(a)(1) and (c) of the BBRA requires that we implement 
the IPF PPS in a budget neutral manner. In other words, the amount of 
total payments under the IPF PPS, including any payment adjustments, 
must be projected to be equal to the amount of total payments that 
would have been made if the IPF PPS were not implemented. Therefore, we 
calculated the budget neutrality factor by setting the total estimated 
IPF PPS payments to be equal to the total estimated payments that would 
have been made under the Tax Equity and Fiscal Responsibility Act of 
1982 (TEFRA) (Pub. L. 97-248) methodology had the IPF PPS not been 
implemented. A step-by-step description of the methodology used to 
estimate payments under the TEFRA payment system appears in the RY 2005 
IPF PPS final rule (69 FR 66926).
    Under the IPF PPS methodology, we calculated the final Federal per 
diem base rate to be budget neutral during the IPF PPS implementation 
period (that is, the 18-month period from January 1,

[[Page 37636]]

2005, through June 30, 2006) using a July 1 update cycle. We updated 
the average cost per day to the midpoint of the IPF PPS implementation 
period (October 1, 2005), and this amount was used in the payment model 
to establish the budget neutrality adjustment.
    Next, we standardized the IPF PPS Federal per diem base rate to 
account for the overall positive effects of the IPF PPS payment 
adjustment factors by dividing total estimated payments under the TEFRA 
payment system by estimated payments under the IPF PPS. The information 
concerning this standardization can be found in the RY 2005 IPF PPS 
final rule (69 FR 66932) and the RY 2006 IPF PPS final rule (71 FR 
27045). We then reduced the standardized Federal per diem base rate to 
account for the outlier policy, the stop loss provision, and 
anticipated behavioral changes. A complete discussion of how we 
calculated each component of the budget neutrality adjustment appears 
in the RY 2005 IPF PPS final rule (69 FR 66932 and 66933) and in the RY 
2007 IPF PPS final rule (71 FR 27044 through 27046). The final 
standardized budget neutral Federal per diem base rate established for 
cost reporting periods beginning on or after January 1, 2005 was 
calculated to be $575.95.
    The Federal per diem base rate has been updated in accordance with 
applicable statutory requirements and 42 CFR 412.428 through 
publication of annual notices or proposed and final rules. A detailed 
discussion on the standardized budget neutral Federal per diem base 
rate and the ECT payment per treatment appears in the FY 2014 IPF PPS 
update notice (78 FR 46738 through 46740). These documents are 
available on the CMS website at <a href="https://www.cms.gov/Medicare/Medicare-Fee-for-Service-Payment/InpatientPsychFacilPPS/index.html">https://www.cms.gov/Medicare/Medicare-Fee-for-Service-Payment/InpatientPsychFacilPPS/index.html</a>.
    As discussed in sections IV.D.5. and IV.D.6. of this final rule, we 
proposed to revise the facility-level adjustment factors for FY 2026 
pursuant to section 1886(s)(5)(D)(i) of the Act. Section 
1886(s)(5)(D)(iii) of the Act requires that revisions to IPF payment 
rates implemented pursuant to section 1886(s)(5)(D)(i) of the Act must 
be made budget-neutrally. Therefore, as discussed in section IV.D.9. of 
this final rule, we proposed to apply a standardization factor to the 
FY 2026 base rate that takes these refinements of facility-level 
adjustments into account to keep total IPF PPS payments budget neutral.
2. Determining the Electroconvulsive Therapy (ECT) Payment per 
Treatment
    In the RY 2005 IPF PPS final rule (69 FR 66951), we analyzed the 
costs of IPF stays that included ECT treatment using the FY 2002 
Medicare Provider and Analysis Review (MedPAR) data based on comments 
we received on the RY 2005 IPF PPS proposed rule. Consistent with the 
comments we received about ECT, our analysis and review indicated that 
cases with ECT treatment are substantially more costly than cases 
without ECT treatment. Based on this analysis, in that final rule we 
finalized an additional payment for each ECT treatment furnished during 
the IPF stay. This ECT payment per treatment is made in addition to the 
per diem and outlier payments under the IPF PPS. To receive the payment 
per ECT treatment, IPFs must indicate on their claims the revenue code 
and procedure code for ECT (Rev Code 901; procedure code 90870) and the 
number of units of ECT, that is, the number of ECT treatments the 
patient received during the IPF stay.
    To establish the ECT per treatment payment, we used the pre-scaled 
and pre-adjusted median cost for procedure code 90870 developed for the 
Hospital Outpatient Prospective Payment System (OPPS), based on 
hospital claims data. We explained in the RY 2005 IPF PPS final rule 
that we used OPPS data because after careful review and analysis of IPF 
claims, we were unable to separate out the cost of a single ECT 
treatment (69 FR 66922). We used the unadjusted hospital claims data 
under the OPPS because we did not want the ECT payment under the IPF 
PPS to be affected by factors that are relevant to OPPS, but not 
specifically applicable to IPFs. The median cost was then standardized 
and adjusted for budget neutrality. We also adjusted the ECT rate for 
wage differences in the same manner that we adjust the per diem rate.
    Since the ECT payment rate was established in the RY 2005 IPF PPS 
rule, it has been updated annually by application of each year's market 
basket, productivity adjustment, and wage index budget neutrality 
factor to the previous year's ECT payment rate (referred to as our 
``standard methodology'' in this section).
    We last updated the ECT payment amount per treatment for FY 2025. 
As we explained in the FY 2025 IPF PPS proposed rule (89 FR 23146), we 
analyzed recent data from both the IPF PPS and the OPPS. Findings 
revealed that costs for IPF stays involving ECT were significantly more 
costly than stays without ECT, with cost driven primarily by longer 
stays and higher ancillary expenses. These IPF stays with ECT 
treatment, which accounted for only 1.7 percent of all IPF stays in 
2022 (down from 6.0 percent in 2002), were approximately three times 
more costly than IPF stays without ECT treatment. We noted that on 
average, IPF stays with ECT cost $44,687.50 compared to $15,432.30 for 
IPF stays without ECT treatment in 2022, with notable increases in per-
day costs and ancillary expenses. While our standard payment update 
methodologies would have resulted in only minor adjustments, the 
analysis indicated that the updates to the ECT payment rates since 2005 
had not kept pace with rising costs.
    To address this, we finalized a new ECT payment calculation based 
on the pre-scaled and pre-adjusted CY 2024 OPPS geometric mean cost, 
adjusted by the market basket update and wage index budget neutrality 
factor. We stated that the change to the ECT per treatment amount 
aligned payments more closely with the actual cost of providing ECT. We 
noted that the increase to the ECT per treatment amount would be 
associated with a minor decrease to the IPF per diem base rate as a 
result of the refinement standardization factor, and it would increase 
payments to facilities providing ECT. A complete discussion of the 
final FY 2025 ECT payment per treatment can be found in the FY 2025 IPF 
PPS final rule (89 FR 64591 through 64593).
3. Update of the Federal per Diem Base Rate and Electroconvulsive 
Therapy Payment per Treatment
    The current (FY 2025) Federal per diem base rate is $876.53 and the 
ECT payment per treatment is $661.52. For the final FY 2026 Federal per 
diem base rate, we applied the final IPF market basket update of 2.5 
percent (that is, the final 2021-based IPF market basket percentage 
increase for FY 2026 of 3.2 percent reduced by the final productivity 
adjustment of 0.7 percentage point), the final wage index budget 
neutrality factor of 1.0011 (as discussed in section IV.D.4.c. of this 
final rule), and the final refinement standardization factor of 0.9927 
(as discussed in section IV.D.9. of this final rule) to the FY 2025 
Federal per diem base rate of $876.53, yielding a final Federal per 
diem base rate of $892.87 for FY 2026. We applied the final IPF market 
basket update of 2.5 percent, the final wage index budget neutrality 
factor of 1.0011, and the final refinement standardization factor of 
0.9927 to the final FY 2025 ECT payment per treatment of $661.52, 
yielding a final ECT payment per treatment of $673.85 for FY 2026.

[[Page 37637]]

    Section 1886(s)(4)(A)(i) of the Act requires that for RY 2014 and 
each subsequent RY, in the case of an IPF that fails to report required 
quality data with respect to such RY, the Secretary will reduce any 
annual update to a standard Federal rate for discharges during the RY 
by 2.0 percentage points. Therefore, we applied a 2.0 percentage point 
reduction to the final annual update to the Federal per diem base rate 
and the final ECT payment per treatment as follows:
    <bullet> For IPFs that fail to report required data under the IPFQR 
Program, we will apply a 0.5 percent payment rate update--that is, the 
final IPF market basket increase for FY 2026 of 3.2 percent reduced by 
the final productivity adjustment of 0.7 percentage point for an update 
of 2.5 percent, and further reduced by 2.0 percentage points in 
accordance with section 1886(s)(4)(A)(i) of the Act. We will also apply 
the refinement standardization factor of 0.9927 and the wage index 
budget neutrality factor of 1.0011 to the FY 2025 Federal per diem base 
rate of $876.53, yielding a Federal per diem base rate of $875.44 for 
FY 2026.
    <bullet> For IPFs that fail to report required data under the IPFQR 
Program, we will apply a 0.5 percent payment rate update, the 0.9927 
refinement standardization factor, and the 1.0011 wage index budget 
neutrality factor to the FY 2025 ECT payment per treatment of $661.52, 
yielding an ECT payment per treatment of $660.70 for FY 2026.

C. Updates to the IPF PPS Patient-Level Adjustment Factors

1. Overview of the IPF PPS Adjustment Factors
    The IPF PPS payment adjustment factors were originally derived from 
a regression analysis of 100 percent of the FY 2002 MedPAR data file, 
which contained 483,038 cases. For a more detailed description of the 
data file used for this regression analysis, we refer readers to the RY 
2005 IPF PPS final rule (69 FR 66935 and 66936).
    In FY 2025, we implemented revisions to the methodology for 
determining payment rates under the IPF PPS, as required by section 
1886(s)(5)(D) of the Act. We developed the current (FY 2025) adjustment 
factors based on a regression analysis of IPF cost and claims data. The 
primary sources of this analysis were CY 2019 through 2021 MedPAR files 
and Medicare cost report data (CMS Form 2552-10, OMB No. 0938-0050) 
from the FY 2019 through 2021 Hospital Cost Report Information System 
(HCRIS). For a more detailed description of the data files used for 
this regression analysis, we refer readers to the FY 2025 IPF PPS final 
rule (89 FR 64593 through 64601).
    For FY 2026, we proposed to use the existing regression-derived 
patient-level adjustment factors established for FY 2025. We did not 
propose any changes to the patient-level adjustment factors for FY 
2026; however, we used more recent claims data to simulate payments, to 
finalize the outlier fixed dollar loss threshold amount, and to assess 
the impact of the IPF PPS updates.
2. IPF PPS Patient-Level Adjustments
    The IPF PPS includes payment adjustments for the following patient-
level characteristics: Medicare Severity Diagnosis Related Groups (MS-
DRGs) assignment of the patient's principal diagnosis, selected 
comorbidities, patient age, and the variable per diem adjustments.
a. Update to MS-DRG Assignment
    We believe it is important to maintain for IPFs the same diagnostic 
coding and DRG classification used under the IPPS for providing 
psychiatric care. For this reason, when the IPF PPS was implemented for 
cost reporting periods beginning on or after January 1, 2005, we 
adopted the same diagnostic code set (ICD-9 Clinical Modification (CM)) 
and DRG patient classification system (MS-DRGs) that were utilized at 
the time under the IPPS. In the RY 2009 IPF PPS notice (73 FR 25709), 
we discussed CMS's effort to better recognize resource use and the 
severity of illness among patients. CMS adopted the new MS-DRGs for the 
IPPS in the FY 2008 IPPS final rule with comment period (72 FR 47130). 
In the RY 2009 IPF PPS notice (73 FR 25716), we provided a crosswalk to 
reflect changes that were made under the IPF PPS to adopt the new MS-
DRGs. For a detailed description of the mapping changes from the 
original DRG adjustment categories to the current MS-DRG adjustment 
categories, we refer readers to the RY 2009 IPF PPS notice (73 FR 
25714).
    The IPF PPS includes payment adjustments for designated psychiatric 
DRGs assigned to the claim based on the patient's principal diagnosis. 
The DRG adjustment factors were expressed relative to the most 
frequently reported psychiatric DRG in FY 2002, that is, DRG 430 
(psychoses). The coefficient values and adjustment factors were derived 
from the regression analysis discussed in detail in the RY 2004 IPF 
proposed rule (68 FR 66923; 66928 through 66933) and the RY 2005 IPF 
final rule (69 FR 66933 through 66960). Mapping the DRGs to the MS-DRGs 
resulted in 17 IPF MS-DRGs, instead of the original 15 DRGs, for which 
the IPF PPS provides an adjustment.
    In the FY 2015 IPF PPS final rule (79 FR 45945 through 45947), we 
finalized conversions of the ICD-9-CM-based MS-DRGs to ICD-10-CM/
Procedure Coding System (PCS)-based MS-DRGs, which were implemented on 
October 1, 2015. Further information on the ICD-10-CM/PCS MS-DRG 
conversion project can be found on the CMS ICD-10-CM website at <a href="https://www.cms.gov/medicare/coding-billing/icd-10-codes/icd-10-ms-drg-conversion-project">https://www.cms.gov/medicare/coding-billing/icd-10-codes/icd-10-ms-drg-conversion-project</a>.
    In the FY 2025 IPF PPS final rule (89 FR 64602 through 64606), we 
revised the payment adjustments for designated psychiatric DRGs 
assigned to the claim based on the patient's principal diagnosis, 
following our longstanding policy of using the ICD-10-CM/PCS-based MS-
DRG system. In that final rule, we identified 19 DRGs for which the IPF 
PPS adjusts payment. In addition, we implemented a sub-regulatory 
process to adopt routine coding updates that incorporate new or revised 
codes with an April 1 effective date (89 FR 64602 and 64603).
    For FY 2026, we proposed to continue making the existing payment 
adjustments for psychiatric diagnoses that group to one of the existing 
19 IPF MS-DRGs listed in Addendum A. We did not receive any comments on 
this proposal, and we are finalizing it as proposed. Addendum A is 
available on our website at <a href="https://www.cms.gov/Medicare/Medicare-Fee-forService-Payment/InpatientPsychFacilPPS/tools.html">https://www.cms.gov/Medicare/Medicare-Fee-forService-Payment/InpatientPsychFacilPPS/tools.html</a>. Psychiatric 
principal diagnoses that do not group to one of the 19 designated MS-
DRGs will still receive the Federal per diem base rate and all other 
applicable adjustments, but the payment will not include an MS-DRG 
adjustment.
    The diagnoses for each IPF MS-DRG will be updated as of October 1, 
2025, using the final IPPS FY 2026 ICD-10-CM/PCS code sets. The FY 2026 
IPPS/LTCH PPS final rule will include tables of the changes to the ICD-
10-CM/PCS code sets that underlie the final FY 2026 IPF MS-DRGs. Both 
the FY 2026 IPPS/LTCH PPS final rule and the tables of final changes to 
the ICD-10-CM/PCS code sets, which underlie the FY 2026 MS-DRGs, will 
be available on the CMS IPPS website at <a href="https://www.cms.gov/medicare/payment/prospective-payment-systems/acute-inpatient-pps">https://www.cms.gov/medicare/payment/prospective-payment-systems/acute-inpatient-pps</a>.
    Additionally, as discussed in the ICD-10-CM Official Guidelines for 
Coding and Reporting, certain conditions have both an underlying 
etiology and multiple body system manifestations

[[Page 37638]]

due to the underlying etiology. For such conditions, the ICD-10-CM has 
a coding convention that requires the underlying condition be sequenced 
first, followed by the manifestation. Wherever such a combination 
exists, there is a ``use additional code'' note at the etiology code, 
and a ``code first'' note at the manifestation code. These 
instructional notes indicate the proper sequencing order of the codes 
(etiology followed by manifestation). In accordance with the ICD-10-CM 
Official Guidelines for Coding and Reporting, when a primary 
(psychiatric) diagnosis code has a code first note, the provider will 
follow the instructions in the ICD-10-CM Tabular List. The submitted 
claim goes through the CMS processing system, which will identify the 
principal diagnosis code as non-psychiatric and search the secondary 
codes for a psychiatric code to assign a DRG code for adjustment. The 
system will continue to search the secondary codes for those that are 
appropriate for comorbidity adjustment. For more information on the 
code first policy, we refer readers to the RY 2005 IPF PPS final rule 
(69 FR 66945). We also refer readers to sections I.A.13 and I.B.7 of 
the FY 2020 ICD-10-CM Coding Guidelines, which is available at <a href="https://www.cdc.gov/nchs/data/icd/10cmguidelinesFY2020_final.pdf">https://www.cdc.gov/nchs/data/icd/10cmguidelinesFY2020_final.pdf</a>. In the FY 
2015 IPF PPS final rule, we provided a code first table for reference 
that highlights the same or similar manifestation codes where the code 
first instructions apply in ICD-10-CM that were present in ICD-10-CM 
(79 FR 46009).
    As discussed in the FY 2025 IPF PPS final rule (89 FR 64602 and 
64603), we adopted a sub-regulatory approach to handle the coding 
updates, rather than discussing coding updates in the Federal Register 
during regulatory updates prior to implementation. This approach 
mirrors the approach taken by the IPPS, allows for flexibility in the 
ICD-10 code update process for the IPF PPS, and reduces the lead time 
for making routine coding updates to the IPF PPS code first list, 
comorbidities, and ECT coding categories.
    In the FY 2026 IPF PPS proposed rule, we did not describe any code 
first changes effective for April 1, 2025, and we did not receive any 
comments about coding updates for the IPF PPS code first list. For this 
FY 2026 IPF PPS final rule, we are removing one ICD-10-CM diagnosis 
code and adding eight ICD-10-CM diagnosis codes to the IPF PPS code 
first list effective for October 1, 2025. The final FY 2026 Code First 
table is shown in Addendum B on the CMS website at <a href="https://www.cms.gov/Medicare/Medicare-Fee-forServicePayment/InpatientPsychFacilPPS/tools.html">https://www.cms.gov/Medicare/Medicare-Fee-forServicePayment/InpatientPsychFacilPPS/tools.html</a>.
b. Payment for Comorbid Conditions
    The intent of the comorbidity adjustments is to recognize the 
increased costs associated with active comorbid conditions by providing 
additional payments for certain existing medical or psychiatric 
conditions that are expensive to treat.
    Comorbidities are specific patient conditions that are secondary to 
the patient's principal diagnosis and that require active treatment 
during the stay. Diagnoses that relate to an earlier episode of care 
and have no bearing on the current hospital stay are excluded and must 
not be reported on IPF claims. Comorbid conditions must exist at the 
time of admission or develop subsequently, and affect the treatment 
received, length of stay (LOS), or both treatment and LOS.
    For each claim, an IPF may receive only one comorbidity adjustment 
within a comorbidity category, but it may receive an adjustment for 
more than one comorbidity category. Current billing instructions for 
discharge claims, on or after October 1, 2015, require IPFs to enter 
the complete ICD-10-CM codes for up to 24 additional diagnoses if they 
co-exist at the time of admission, or develop subsequently and impact 
the treatment provided.
    The IPF PPS comorbidity adjustments were originally determined 
based on the regression analysis using the diagnoses reported by IPFs 
in FY 2002. The principal diagnoses were used to establish the DRG 
adjustments and were not accounted for in establishing the comorbidity 
category adjustments, except where ICD-9-CM code first instructions 
applied. In a code first situation, the submitted claim goes through 
the CMS processing system, which identifies the principal diagnosis 
code as non-psychiatric and searches the secondary codes for a 
psychiatric code to assign an MS-DRG code for adjustment. The system 
continues to search the secondary codes for those that are appropriate 
for a comorbidity adjustment.
    In FY 2025, we revised the comorbidity adjustment factors based on 
the results of the 2019 through 2021 regression analysis described in 
the FY 2025 IPF PPS final rule (89 FR 64606 through 64612). In 
addition, we made additions and changes to the comorbidity categories 
for which we adjust payment based on our analysis of ICD-10-CM codes 
currently included in each category as well as public comments received 
in response to the FY 2022 and FY 2023 IPF PPS proposed rules. 
Specifically, we removed 3 existing comorbidity categories, revised 2 
existing comorbidity categories, and added 1 new comorbidity category. 
We finalized 15 comorbidity categories for FY 2025.
    We did not propose any changes to the comorbidity adjustment 
factors, and we are retaining the existing comorbidity adjustment 
factors for FY 2026. The final FY 2026 comorbidity adjustment factors 
are found in Addendum A, available on the CMS website at <a href="https://www.cms.gov/Medicare/Medicare-Fee-for-ServicePayment/InpatientPsychFacilPPS/tools.html">https://www.cms.gov/Medicare/Medicare-Fee-for-ServicePayment/InpatientPsychFacilPPS/tools.html</a>.
    As noted previously, it is our policy to maintain the same 
diagnostic coding set for IPFs that is used under the IPPS for 
providing the same psychiatric care. In the FY 2015 IPF PPS final rule 
(79 FR 45947 through 45955), the comorbidity categories formerly 
defined using ICD-9-CM codes were converted to ICD-10-CM/PCS. The goal 
for converting the comorbidity categories is referred to as 
replication, meaning that the payment adjustment for a given patient 
encounter is the same after ICD-10-CM implementation as it would be if 
the same record had been coded in ICD-9-CM and submitted prior to ICD-
10-CM/PCS implementation on October 1, 2015. All conversion efforts 
were made with the intent of achieving this goal.
    As discussed in section IV.C.2.a of this final rule, in the FY 2025 
IPF PPS final rule (89 FR 64602 and 64603) we adopted an April 1 
implementation date for ICD-10-CM diagnosis and ICD-10-PCS procedure 
code updates, in addition to the annual October 1 update, beginning 
with April 1, 2025 for the IPF PPS. Coding updates related to the IPF 
PPS comorbidity categories are adopted following a sub-regulatory 
process as finalized in the FY 2025 IPF PPS final rule (89 FR 64602 and 
64603). In the FY 2026 IPF PPS proposed rule, we explained that for 
April 1, 2025, we added two ICD-10-PCS procedure codes to the Oncology 
Treatment Procedures list. We did not receive any comments on the April 
1, 2025, coding changes.
    For this FY 2026 IPF PPS final rule, we are adding 12 ICD-10-CM 
diagnosis codes to the Poisoning code list, removing 4 ICD-10-PCS 
procedure codes to the Oncology Treatment Procedure code list, and 
adding 2 ICD-10-CM diagnosis codes to the Oncology Treatment Diagnosis 
code list. The final FY 2026 comorbidity codes are shown in Addenda B, 
available on the CMS website at https://www.cms.gov/Medicare/Medicare-
Fee-for-

[[Page 37639]]

ServicePayment/InpatientPsychFacilPPS/tools.html.
c. Patient Age Adjustments
    As explained in the RY 2005 IPF PPS final rule (69 FR 66922), we 
analyzed the impact of age on per diem cost by examining the age 
variable (range of ages) for payment adjustments. In general, we found 
that the cost per day increases with age. The older age groups are 
costlier than the under 45 age group, the differences in per diem cost 
increase for each successive age group, and the differences are 
statistically significant. In FY 2025, we adopted revised patient age 
adjustments derived from the regression model using a blended set of 
2019 through 2021 data (89 FR 64612 and 64613). For FY 2026, we 
proposed to use the patient age adjustments currently in effect for FY 
2025.
    We did not propose any changes to the patient age adjustment 
factors, and we are retaining the existing patient age adjustment 
factors for FY 2026, as shown in Addendum A of this final rule (see 
<a href="https://www.cms.gov/Medicare/Medicare-Fee-for-ServicePayment/InpatientPsychFacilPPS/tools.html">https://www.cms.gov/Medicare/Medicare-Fee-for-ServicePayment/InpatientPsychFacilPPS/tools.html</a>).
d. Variable Per Diem Adjustments
    We explained in the RY 2005 IPF PPS final rule (69 FR 66946) that 
the regression analysis indicated that per diem cost declines as the 
LOS increases. The variable per diem adjustments to the Federal per 
diem base rate account for ancillary and administrative costs that 
occur disproportionately in the first days after admission to an IPF. 
As discussed in the RY 2005 IPF PPS final rule, where a complete 
discussion of the variable per diem adjustments can be found, we used a 
regression analysis to estimate the average differences in per diem 
cost among stays of different lengths (69 FR 66947 through 66950). As a 
result of this analysis, we established variable per diem adjustments 
that begin on day 1 and decline gradually over the course of the 
patient's stay. In addition, the adjustment applied to day 1 depends 
upon whether the IPF has a qualifying ED. If an IPF has a qualifying 
ED, it receives a higher adjustment factor for day 1 of each stay than 
it would receive if it did not have a qualifying ED. The ED adjustment 
is explained in more detail in section IV.D.8. of this final rule.
    In FY 2025, we revised the variable per diem adjustment factors 
based on the 2019 through 2021 regression analysis (89 FR 64613 and 
64614). For FY 2026, we proposed to use the variable per diem 
adjustment factors currently in effect in FY 2025.
    We did not propose any changes to the variable per diem adjustment 
factors, and we are retaining the existing variable per diem adjustment 
factors for FY 2026 as shown in Addendum A of this final rule 
(available at <a href="https://www.cms.gov/Medicare/Medicare-Fee-for-ServicePayment/InpatientPsychFacilPPS/tools.html">https://www.cms.gov/Medicare/Medicare-Fee-for-ServicePayment/InpatientPsychFacilPPS/tools.html</a>).

D. Updates to the IPF PPS Facility-Level Adjustments

1. Overview of the IPF PPS Facility-Level Adjustment Factors
    The IPF PPS includes facility-level adjustments for the wage index, 
IPFs located in rural areas, teaching IPFs, cost of living adjustments 
for IPFs located in Alaska and Hawaii, and IPFs with a qualifying ED. 
The facility-level adjustment factors currently in place for rural 
location and teaching status are the existing regression-derived 
factors established in the RY 2005 IPF final rule. As discussed in the 
following sections, we proposed annual updates to the FY 2026 IPF PPS 
wage index. In addition, we proposed to update the facility-level 
adjustment factors for rural location and teaching status for FY 2026 
to reflect more recent cost and claims data.
2. History of IPF PPS Cost and Claims Analyses
    In the FY 2023 IPF PPS proposed rule (87 FR 19428 and 19429), we 
briefly discussed past analyses and areas of interest for future 
refinement, about which we previously solicited comments. At the same 
time, CMS also released a technical report posted to the CMS website 
\3\ accompanying the rule, summarizing these analyses. In that same 
proposed rule, we described the results of the agency's latest analysis 
of the IPF PPS and solicited comments on certain topics from the 
report. We summarized the considerations and findings related to our 
analyses of the IPF PPS adjustment factors in the FY 2023 IPF PPS final 
rule (46864 through 46865).
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    \3\ <a href="https://www.cms.gov/files/document/technical-report-medicare-program-inpatient-psychiatric-facilities-prospective-payment-system.pdf">https://www.cms.gov/files/document/technical-report-medicare-program-inpatient-psychiatric-facilities-prospective-payment-system.pdf</a>.
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    In the FY 2024 IPF PPS proposed rule (88 FR 21269 through 21272), 
we requested information from the public to inform revisions to the IPF 
PPS required by the CAA, 2023. Specifically, we sought information 
about which data and information would be most appropriate and useful 
for the purposes of refining IPF PPS payments. We requested information 
related to the specific types of data and information mentioned in the 
CAA, 2023. We also solicited comments on the reporting of ancillary 
charges, such as labs and drugs, on IPF claims.
    In response to those requests for information in the FY 2024 IPF 
PPS proposed rule, commenters offered a number of suggestions for 
further analysis, including recommendations to consider adjusting 
payment for patients with sleep apnea, violent behavior, and patients 
that transfer from an acute care unit.
    In the FY 2025 IPF PPS proposed rule, we discussed our latest 
regression analysis results and the methodology we used to calculate 
proposed revisions to the patient-level adjustment factors (89 FR 23154 
through 23161). In that same proposed rule (89 FR 23161 through 23172), 
we also discussed the analyses that we conducted and our findings, as 
related to patient-level adjustment factors, in response to the 
comments we received on the FY 2024 IPF PPS proposed rule.
    As we have previously noted in the FY 2025 IPF PPS proposed rule 
(89 FR 23154), the primary goal in refining the IPF PPS payment 
adjustment factors is to pay each IPF an appropriate amount for the 
efficient delivery of care to Medicare beneficiaries. The system must 
be able to account adequately for each IPF's case-mix to allow for both 
fair distribution of Medicare payments and access to adequate care for 
those beneficiaries who require more costly care. As required by 
section 1886(s)(5)(D)(iii) of the Act, revisions to the IPF PPS 
adjustment factors made pursuant to section 1886(s)(5)(D)(i) of the Act 
must be budget neutral. As discussed in section IV.D.9 of this final 
rule, we are applying a refinement standardization factor to the final 
IPF PPS payment rates to maintain budget neutrality for FY 2026.
3. Development of the Revised Regression for Facility-Level Refinements
    In the FY 2026 IPF PPS proposed rule, we explained that we 
performed an extensive regression analysis of the relationship between 
the per diem costs and certain patient- and facility-level 
characteristics to analyze those characteristics associated with 
statistically significant cost differences. As discussed in section 
IV.C of this final rule, we finalized revisions to the IPF PPS patient-
level adjustments in the FY 2025 IPF PPS final rule (89 FR 64593 
through 64614). As a result, we used a constrained regression model for 
FY 2026 to hold the patient-level adjustments at the level finalized 
for FY 2025. We discuss the results of this constrained regression 
analysis in

[[Page 37640]]

section IV.D.3.e of this final rule. We further discuss policies 
related to the revisions to the IPF PPS facility-level adjustment 
factors based on this regression analysis in sections IV.D.5 and IV.D.6 
of this final rule.
    For this FY 2026 IPF PPS final rule, we calculated a per diem cost 
(including routine and ancillary components) and identified patient and 
facility characteristics for each Medicare inpatient psychiatric stay 
using information from MedPAR files, Common Working File (CWF) 
inpatient claims, Medicare hospital cost reports, and other data 
sources for FY 2020 through FY 2022. We refer readers to the FY 2025 
IPF PPS final rule for a discussion of the impact of the COVID-19 PHE 
and the benefits of using a combined set of data for the accuracy of 
the results (89 FR 64594).
    We began with a base sample of IPF stays by Medicare FFS 
beneficiaries in MedPAR from FY 2020 through FY 2022, which contain a 
total of 712,543 stays from 1,650 IPFs. We applied several data 
restrictions and exclusions to remove stays with missing and or 
aberrant data. The final sample used for the regression analysis 
contained 704,472 stays from 1,633 IPFs, which reflects the removal of 
17 providers and 8,071 stays.
    In preparing the cost regression sample and analysis, we 
incorporated more recent input data and refined our data processing 
method, as described in this section. We estimated a baseline 
regression using the constrained model and conducted sensitivity 
analysis to confirm the robustness of our results.
a. Data Sources
    For the regression analysis, our primary data sources include the 
annual MedPAR files, which provide stay-level summaries of IPF stays, 
and Medicare hospital cost reports, which contain provider-level data 
on costs, utilization, and other financial information. Additionally, 
we used the Common Working File (CWF) claims data, the Provider of 
Services (POS) files, and the Provider Specific File (PSF) to identify 
provider and patient characteristics and to construct variables in the 
regression model.
    More specifically, we used the following sources of data:
    <bullet> MedPAR Files: The annual MedPAR file compiles final action 
claims records for IPF stays discharged during the fiscal year. Each 
MedPAR record provides a summary of clinical characteristics, service 
utilization, facility billings, and Medicare coverage for an inpatient 
hospital stay. We use MedPAR to identify all IPF stays by Medicare FFS 
beneficiaries during the fiscal year, along with key variables such as 
MS-DRG, principal and secondary diagnosis, length of stay, patient age, 
admission source, provider charges by revenue center, and other patient 
and provider attributes. For the FY 2026 final rule cost regression, we 
used MedPAR files for FY 2020 through FY 2022.
    <bullet> Hospital Cost Reports: Medicare hospital cost reports (CMS 
Form 2552-10; OMB control number 0938-0050) provide the key inputs for 
estimating the per diem cost of IPF stays, specifically the facility's 
routine per diem cost and Cost-to-Charge Ratios (CCRs) for detailed 
cost centers for each Federal FY. We also use hospital cost reports to 
obtain key facility characteristics, including teaching status, bed 
counts, and ownership type. For providers whose own fiscal periods 
align with the FY, we directly match their FY 2020-FY 2022 hospital 
cost reports to the corresponding MedPAR stays. For providers whose own 
fiscal periods differ from the FY, we use multiple years of hospital 
cost reports data and proportionally allocate and align them to the FY 
basis for FY 2020 through FY 2022 before linking them to other data 
sources. This allocation and alignment is discussed in greater detail 
later in this section of this final rule.
    <bullet> Common Working File (CWF) Inpatient Claims Data: We use 
detailed claims data from the CWF to supplement MedPAR stay records, 
specifically obtaining data on covered charges by detailed revenue 
center and utilization of ECT treatments during each IPF stay. To 
promote internal consistency, we use the CWF claims data with the same 
final action week as the corresponding MedPAR record.
    <bullet> Provider of Services (POS) File: The POS file contains 
facility characteristics such as name, address, and types of services 
provided. For the regression analysis for this FY 2026 IPF PPS final 
rule, we primarily use the POS file to identify providers' Federal 
Information Processing Series (FIPS) codes, which determine each 
provider's designated Core-Based Statistical Area (CBSA). The CBSA is 
then used to match providers with the corresponding geographic cost 
adjustment factor. Additionally, we use the POS file as a secondary 
source for provider ownership type.
    <bullet> Provider Specific Data for Public Use Files for the IPF 
PPS: We use the Provider Specific File (PSF) to identify providers' 
COLA factors and other facility-level characteristics, including 
whether a facility has a qualified Emergency Department (ED).
    <bullet> IPF Market Baskets: We used the historical IPF market 
basket increases and labor-related shares for the FY 2020-FY 2022 
period.
    <bullet> IPF PPS Wage Index: We use the IPF PPS wage index, along 
with COLA and labor-related share, to calculate the geographic cost 
adjustment factor, which accounts for regional cost differences among 
providers in each year. In this analysis, we used the FY 2024 IPF PPS 
wage index to adjust IPF costs in FY 2020, and FY 2025 IPF PPS wage 
index to adjust IPF costs in FY 2021 and FY 2022.
b. Trims and Assumptions
    For the FY 2026 final rule regression analysis, we used a combined 
set of FY 2020 through FY 2022 MedPAR data, consistent with the 
approach we adopted for the FY 2025 IPF PPS proposed and final rules to 
revise the patient-level adjustment factors. Our analysis demonstrated 
that combining multiple years of data yields the most stable and 
consistent result. We continue to believe that using a 3-year combined 
set of data in the regression analysis helps smooth the impact of 
utilization changes driven by the COVID-19 PHE, as well as significant 
changes in staffing and labor costs that commenters noted in response 
to the FY 2023 and FY 2024 IPF PPS proposed rules. This data set best 
reflects the current cost of care as impacted by the COVID-19 PHE, 
which has an ongoing impact on IPF cost and utilization trends. Our 
approach mitigates the effect of these impacts in any single year by 
expanding the set of data.
    Within the MedPAR dataset, we included inpatient hospital stays 
that met the following criteria:
    <bullet> Hospital CMS Certification Number (CCN) contains ``40'', 
``41'', ``42'', ``43'', or ``44'' in the third and fourth positions 
(freestanding psychiatric hospitals), a special unit code of ``S'' in 
the third position (psychiatric unit in an acute care hospital), a 
special unit code of ``M'' in the third position (psychiatric unit in a 
critical access hospital), or a special unit code of ``SA'', ``SB'', 
``SC'', ``SD'', or ``SE'' in the third and fourth positions 
(psychiatric unit in a long-term care hospital (LTCH), rehabilitation 
hospital, or children's hospital).
    <bullet> Beneficiary primary payer code is ``M'', ``N'', or blank, 
indicating that Medicare is the primary payer.
    <bullet> Group Health Organization (GHO) paid code is zero or 
blank, indicating that a GHO has not paid the facility for the stay.

[[Page 37641]]

    <bullet> National Claims History (NCH) claim type code is ``60,'' 
indicating a fee-for-service (FFS) inpatient claim.
    <bullet> Covered charge and covered days (or Medicare utilization 
days) are greater than zero.\1\
    For the FY 2020 through FY 2022 sample period, a total of 712,543 
patient stays from 1,650 unique providers in MedPAR met these selection 
criteria. That includes 284,176 stays from 1,587 providers in FY 2020, 
231,668 stays from 1,546 providers in FY 2021, and 196,699 stays from 
1,522 providers in FY 2022.
    Using this base sample, we applied a series of additional trimming 
steps to remove stays with missing or outlier cost data. A detailed 
description of how we estimate IPF per diem costs is provided in 
section IV.D.3.c of this-final rule. We removed the following:
    <bullet> Stays with missing routine per diem cost data or missing 
provider hospital cost reports for the FY 2020-FY 2022 period. This 
step removed 240 stays from the sample, which came from 13 unique 
providers.
    <bullet> Stays with extraordinarily high or low costs per day. 
Specifically, we removed 2,345 stays whose routine per diem costs fell 
outside the mean plus or minus 3.00 standard deviations of the natural 
logarithm of routine per diem costs in the combined 3-year sample. We 
also removed an additional 1,631 stays with total per diem costs that 
fell outside the mean plus or minus 3.00 standard deviations of the 
natural logarithm of total per diem costs in the combined 3-year 
sample. (All cost estimates were adjusted for geographic differences 
and year-over-year inflation.) In total, this trimming step removed 
3,976 stays with extraordinarily high or low costs per day from 323 
providers across the 3-year sample.\2\
    Finally, we excluded all stays with an MS-DRG that is not 
recognized by the IPF PPS, which removed 3,855 stays from 954 providers 
from the remaining sample.
    After these trimming steps, our final cost regression sample 
included 704,472 IPF stays by Medicare FFS beneficiaries from 1,633 
unique IPF providers in MedPAR FY 2020 through FY 2022. This final 
sample consists of 280,959 stays from 1,569 providers in FY 2020, 
229,125 stays from 1,521 providers in FY 2021, and 194,388 stays from 
1,491 providers in FY 2022.
c. Calculation of the Dependent Variable
    The regression model for this FY 2026 IPF PPS final rule uses the 
natural logarithm of the total per diem cost, adjusted for geographic 
differences and inflation, as the dependent variable. Total per diem 
costs are calculated as the sum of routine per diem costs and ancillary 
per diem costs, with both components including operating and capital 
costs.
    <bullet> Routine per diem costs are derived from facility-level 
average routine cost per day reported in provider hospital cost reports 
as total inpatient routine costs divided by total inpatient days 
(Worksheet D-1, Part II, column 1, Line 41 divided by Line 9)\3\ and 
assigned to individual patient stays within the facility.
    <bullet> Ancillary per diem costs are calculated by applying the 
cost center cost-to-charge ratio (CCR) from the cost report to the 
covered charges from ancillary departments on CWF inpatient claims, 
then dividing by the number of Medicare covered days of the stay 
(available in MedPAR).
    The total per diem costs (or costs per day) are further adjusted 
for geographic cost differences using IPF wage indices (for the labor-
related share portion) and COLA factors (for the non-labor-related 
share portion for IPFs located in Alaska and Hawaii). Cost estimates 
are also adjusted for annual inflation based on the historical growth 
rates of the 2021-based IPF market basket.
    To promote consistency, accuracy, and comparability of our data, we 
apply a series of methodological steps when calculating the dependent 
variable as follows:
(1) Addressing Variation in Cost Report Reporting Periods
    Because providers can select their own fiscal/reporting periods for 
hospital cost reports, there is a lack of uniformity in the time 
periods covered by the raw cost report data from different providers. 
For example, within each annual HCRIS file, roughly 40 percent of the 
reports have a January through December cost reporting period (Calendar 
Year), 30 percent have a July through June cost reporting period, 15 
percent have an October through September cost reporting period 
(Federal fiscal year (FFY), and the remaining 15 percent cover various 
other cost reporting periods. Moreover, some providers change their 
fiscal/reporting periods mid-year (sometimes due to an ownership 
change), resulting in shorter or longer hospital cost reports and, in 
some cases, multiple hospital cost reports within a single year.
    To address this lack of uniformity in provider reporting periods 
and enhance data accuracy and consistency, we apply a re-allocation 
procedure to align all provider hospital cost reports data to the FFY 
basis before matching them to MedPAR stays. First, we allocate each 
provider's annual cost report data across the months, assuming uniform 
values per month within the reporting period. Then we regroup the 
monthly data to align with the FFY for each provider and calculate 
annual averages. When data for some months are missing, we use 
available partial-year data to extrapolate and construct the annual 
estimate.
    For example, suppose a provider uses the CY as its cost reporting 
period. Its reported average routine per diem cost was $900 in CY 2019, 
$950 in CY 2020, $1000 in CY 2021, and $1100 in CY 2022. Its CCR for 
laboratory services is 0.30 in CY 2019, 0.25 in CY 2020, 0.32 in CY 
2021, and 0.28 in CY 2022. Using the reallocation method, this 
provider's average routine per diem costs were $937.50 for FY 2020 (= 
3/12*$900 + 9/12*$950), $987.50 for FY 2021, and $1,075.00 for FY 2022. 
Its CCR for laboratory services were 0.2625 for FY 2020, 0.3025 for FY 
2021, and 0.2900 for FY 2022.
(2) Obtaining CCRs for Ancillary Cost Estimation
    To estimate the costs of non-routine services provided during IPF 
stays, we group the cost centers from hospital cost reports and the 
revenue centers from CWF claims into 25 ``ancillary departments'': 
Pharmacy, Laboratory, Emergency Room, Medical/Surgical Supplies, 
Cardiology, Radiology, Magnetic Resonance Imaging (MRI), Physical 
Therapy, Occupational Therapy, Inhalation Therapy, Speech Pathology, 
Anesthesia, Operating Room, Intensive Care Unit (ICU), Coronary Care 
Unit (CCU), End Stage Renal Disease (ESRD), Professional Fees, Clinic 
Visit, Outpatient Services, Durable Medical Equipment (DME), Used DME, 
Blood, Blood Storage and Processing, Lithotripsy, and Other 
Services.\4\
    For each ancillary department, we calculate each provider's CCR 
using the provider's cost report, Worksheet D. Specifically, we take 
ancillary department costs (Worksheet D-3, Column 3), subtract any 
positive inpatient pass-through costs (Worksheet D, Part IV, Column 
11), and divide the result by ancillary department charges (Worksheet 
D-3, Column 2).\5\
    To address extreme values and missing data in CCRs, we apply 
winsorization and imputation. For extreme values, we examine the 
distribution of CCR data (after aligning to FFY) for each ancillary 
department across providers from FY 2020 through FY 2022 and winsorize 
values at the 2nd and 98th percentiles. In addition,

[[Page 37642]]

we consider all CCRs lower than 0.01 or higher than 10.0 as improbable 
and recode them to 0.01 or 10.0, respectively.
    After adjusting for extreme values, we impute missing CCRs using 
available data, prioritizing provider-specific information. (A CCR is 
considered missing only if the provider had charges from the ancillary 
department on MedPAR and CWF claims for that year but did not report a 
CCR.) If a provider's CCR for an ancillary department is missing for a 
given year but available in other years, we use the weighted average of 
the provider's CCRs for that ancillary department from other years 
(weights based on the provider's stay counts in those years) to fill in 
the missing value. If those data are unavailable, we use the provider's 
all-ancillary CCR for that year, the weighted average of the provider's 
all-ancillary CCRs from other years, or the median CCR for that 
ancillary department from other providers of the same type 
(freestanding or unit-based) for that year, in descending order of 
preference. For ancillary departments such as ICU and CCU, where CCRs 
are rarely reported despite the presence of service charges on claims, 
we use the median all-ancillary CCR from other providers of the same 
type to fill in missing values.
(3) Accounting for Geographic Differences and Inflation
    To account for geographic differences in costs, we construct a 
geographic adjustment factor using the formula:

Geographic cost adjustment factor = IPF wage index * labor-related 
share + COLA for AK and HI * (1-labor-related share).
    We adjust the labor-related portion of per diem costs using the IPF 
wage index to account for regional differences in labor costs, while 
the non-labor portion is adjusted using COLA factors for IPFs in Alaska 
and Hawaii. Because the IPF wage index reflects local cost differences 
with a lag, we adjust for that timing discrepancy by applying more 
recent IPF wage indexes to the FY 2020-FY 2022 MedPAR stays. (We remind 
readers that the IPF PPS wage index is based on the pre-floor, pre-
reclassified IPPS hospital wage index, which in turn is derived from 
hospital cost reports data from approximately 3-4 years prior. For 
example, the FY 2025 IPF PPS wage index reflects cost data from local 
labor markets around 2021-2022.) For this analysis, we used the FY 2024 
IPF PPS wage index to adjust IPF costs in FY 2020, and FY 2025 IPF PPS 
wage index to adjust IPF costs in FY 2021 and FY 2022.
    Finally, to promote comparability across the 3 years, we adjust 
cost estimates for year-over-year inflation using historical IPF market 
basket increases and labor-related shares, converting all cost 
estimates into 2022 dollars.
    We calculated routine per diem cost, ancillary per diem cost, and 
the total per diem using the approach discussed in this section for all 
IPF stays in our FY 2020-FY 2022 MedPAR sample. We then excluded stays 
with missing routine costs and outlier routine or total per diem costs, 
based on the approach described earlier in section IV.D.3.b of this 
final rule.
    Among the 704,472 stays in the final FY 2020-FY 2022 cost 
regression sample, the median total per diem cost was $1,135 in 2022 
dollars, with a range of $355 to $4,201 and a mean of $1,205 (the 
standard deviation was $539). Consistent with our approach in the FY 
2025 IPF PPS final rule (89 FR 64596), the stays with zero ancillary 
charges were retained in the sample.
d. Independent Variables
    The independent variables in the regression model represent 
patient-level and facility-level characteristics that influence the 
cost of an IPF stay. Some of these variables are adjustment-related, 
meaning that they are used for payment adjustments, while others are 
control variables, which are used to account for variation in the 
dependent variable associated with factors outside the adjustment 
factors in the payment model.
(1) Adjustment-Related Variables
    Patient-level adjustment-related variables in the model include MS-
DRG, comorbidity categories, patient age, and length of stay. Because 
we did not propose any changes to these patient-level adjustment 
factors in the FY 2026 IPF PPS proposed rule, we constrained their 
coefficients to their corresponding FY 2025 adjustment factor values in 
the regression, instead of estimating them in the model.
    Facility-level adjustment-related variables in the model include 
the facility's teaching status and whether the facility is located in a 
rural area. (A facility's rural status in each year is determined based 
on its CBSA designation.) We refer readers to sections IV.D.4. and 
IV.D.5. of this-final rule for a more detailed explanation of the 
payment adjustment for rural location. In sections III.D.5. and 
III.D.6. of the proposed rule, we proposed to revise the IPF PPS 
payment adjustment factors for these two facility-level characteristics 
based on the estimated coefficients of these variables in the 
constrained regression.
(2) Control Variables
    As we noted in the FY 2025 IPF PPS proposed and final rules (89 FR 
23157; and 89 FR 64596 and 64597, respectively), the original 
regression model included a control variable for the presence of ECT 
because ECT is paid on a per-treatment basis under the IPF PPS. We 
continue to observe that IPF stays with ECT have significantly higher 
costs per day. For FY 2026 we will continue paying for ECT on a per-
treatment basis; therefore, we included a control variable to account 
for the additional costs associated with ECT, which will continue to be 
paid outside the regression model.
    Similarly, we included a control variable for stays with positive 
covered ED-related charges. To address the costs of maintaining an ED 
and providing ED services, IPF PPS pays facilities with a qualified ED 
an additional 26 percent of the payment rate for the first day of the 
stay. To prevent ED adjustment from serving as an incentive for 
unnecessary ED use, all stays in facilities with qualifying EDs receive 
the payment, except in cases when the admission source code is ``D,'' 
indicating that the patient was transferred from the inpatient part of 
the same facility. (In such cases, the ED costs would have already been 
covered under the preceding claim.) The 26 percent ED adjustment, 
updated in the FY 2025 IPF PPS final rule (89 FR 64635 and 64636), was 
calculated in a way that accounts for the percentage of stays with ED 
charges and different admission sources, and that calculation was 
performed outside the cost regression framework. Since our regression 
model includes all costs associated with each IPF stay, including ED 
costs, we included a control variable for stays with positive covered 
ED charges to control for the additional costs associated with ED 
services in this FY 2026 IPF PPS final rule.
    Lastly, we included control variables for the data year. Since the 
model uses a combined set of data from 3 years, we adjusted cost 
estimates for year-over-year inflation using historical IPF market 
basket increases and labor-related shares. However, external factors 
beyond this inflation adjustment may have influenced cost differences 
across the 3 years included in our sample. These factors, such as the 
impact of the COVID-19 PHE, may affect cost variation in our sample 
period. To account for these additional year-related factors, we 
continued to include a set of

[[Page 37643]]

year controls in the FY 2026 IPF PPS final rule regression model.
e. Regression Results
    We estimated the constrained regression using ordinary least 
squares (OLS) on 704,472 IPF stays from FY 2020 to FY 2022, clustering 
standard errors at the provider level. Table 2 presents the estimation 
results, along with the number and percentage of stays associated with 
each independent variable. The regression model has an R-squared value 
of 0.27799, meaning that the independent variables included in the 
regression (facility characteristics and control variables) were able 
to explain approximately 27.8 percent of the variation in per diem 
costs among IPF stays. We note that the R-squared value of our 
regression model is comparable to the R-squared values of prior models 
used for the IPF PPS (for example, see the R-squared value of 0.32340 
in the FY 2025 IPF PPS final rule (89 FR 64597) and the finding that 
the payment model explained 33 percent of the variation in per diem 
cost among IPFs in the RY 2005 IPF PPS final rule (69 FR 66957)).
    Except for the teaching variable, each of the adjustment factors 
presented in Table 2 is the exponentiated regression coefficient from 
our regression model, which as we previously noted uses the natural 
logarithm of per diem total cost as the dependent variable. We present 
the exponentiated regression results, as these most directly translate 
to the way that IPF PPS adjustment factors are calculated for payment 
purposes. That is, the exponentiated adjustment factors presented in 
this-final rule represent a percentage increase or decrease in per diem 
cost for IPF stays with each characteristic. In the case of the 
teaching variable, the result presented is the un-exponentiated 
regression coefficient. As discussed in section IV.D.6. of this final 
rule, the current IPF PPS teaching adjustment is calculated as 1 + a 
facility's ratio of interns and residents to its average daily census, 
raised to the power of 0.5150. The coefficient for teaching status 
presented in Table 2 can be interpreted in the same way.
    Lastly, we consider regression factors to be statistically 
significant when the p-value is less than or equal to the significance 
level of 0.05 (*), 0.01 (**), and 0.001 (***), as notated in the Table 
2 presented in this final rule.
    We discuss the changes to the adjustment factors for IPFs located 
in rural areas and for teaching status in sections IV.D.5. and IV.D.6. 
of this final rule, respectively, and the refinement standardization 
factor in section IV.D.9. of this final rule.

            Table 2--IPF PPS Per Diem Cost Regression Results With Data From FY 2020 Through FY 2022
----------------------------------------------------------------------------------------------------------------
                                              Number of    Percentage of     FY2025     Estimated
           Variable Description             stays FY2020-  Stays FY2020-   adjustment   adjustment   Statistical
                                                FY2022         FY2022        factor       factor    significance
----------------------------------------------------------------------------------------------------------------
Total.....................................       704,472          100.0   ...........  ...........  ............
Provider: Rural...........................        88,437           12.6          1.17         1.18           ***
Provider: Teaching Status, log(1 + FTE           146,175           20.7        0.5150       0.7957           ***
 Residents/Average Daily Census)..........
Control Variable: Stay Has ECT treatment..        11,269            1.6           N/A         1.31           ***
Control Variable: Stay Has Positive              227,647           32.3           N/A         1.46           ***
 Covered ED Charge........................
Control Variable: Stay Discharged in             280,959           39.9           N/A         1.00  ............
 FY2020...................................
Control Variable: Stay Discharged in             229,125           32.5           N/A         1.01            **
 FY2021...................................
Control Variable: Stay Discharged in             194,388           27.6           N/A         1.03           ***
 FY2022...................................
MS-DRG 056: Degenerative Nervous System            4,251            0.6          1.12  ...........  ............
 Disorders w MCC..........................
MS-DRG 057: Degenerative Nervous System           33,401            4.7          1.11  ...........  ............
 Disorders w/out MCC......................
MS-DRG 876: OR Procedures with Principal             671            0.1          1.29  ...........  ............
 Diagnosis of Mental Health...............
MS-DRG 880: Acute Adjustment Reaction and          6,996            1.0          1.08  ...........  ............
 Psychosocial Dysfunction.................
MS-DRG 881: Depressive Neuroses...........        19,756            2.8          1.06  ...........  ............
MS-DRG 882: Neuroses Except Depressive....         8,944            1.3          1.02  ...........  ............
MS-DRG 883: Disorders of Personality and           5,067            0.7          1.17  ...........  ............
 Impulse Control..........................
MS-DRG 884: Organic Disturbances and              48,587            6.9          1.08  ...........  ............
 Intellectual Disability..................
MS-DRG 885: Psychosis.....................       529,855           75.2          1.00  ...........  ............
MS-DRG 886: Behavioral and Developmental           1,340            0.2          1.07  ...........  ............
 Disorders................................
MS-DRG 887: Other Mental Disorder                    309            0.0          1.00  ...........  ............
 Diagnoses................................
MS-DRG 894: Alcohol, Drug Abuse or                 2,631            0.4          0.86  ...........  ............
 Dependence, Left AMA.....................
MS-DRG 895: Alcohol, Drug Abuse or                10,346            1.5          0.90  ...........  ............
 Dependence w Rehab Therapy...............
MS-DRG 896: Alcohol, Drug Abuse or                   920            0.1          1.00  ...........  ............
 Dependence w/out rehab therapy w MCC.....
MS-DRG 897: Alcohol, Drug Abuse or                29,884            4.2          0.95  ...........  ............
 Dependence w/out rehab therapy w/out MCC.
MS-DRG 917: Poisoning and Toxic Effects of           128            0.0          1.19  ...........  ............
 Drugs w MCC..............................
MS-DRG 918: Poisoning and Toxic Effects of           742            0.1          1.12  ...........  ............
 Drugs w/out MCC..........................
MS-DRG 947: Signs and Symptoms w MCC......            56            0.0          1.12  ...........  ............
MS-DRG 948: Signs and Symptoms w/out MCC..           588            0.1          1.09  ...........  ............
Comorbidity: Artificial Openings--                 3,217            0.5          1.07  ...........  ............
 Digestive & Urinary......................
Comorbidity: Cardiac Conditions...........        19,478            2.8          1.04  ...........  ............
Comorbidity: Chronic Obstructive Pulmonary        40,003            5.7          1.09  ...........  ............
 Disease and Sleep Apnea..................
Comorbidity: Developmental Disabilities...        24,782            3.5          1.04  ...........  ............
Comorbidity: Eating Disorders.............         2,577            0.4          1.09  ...........  ............
Comorbidity: Gangrene.....................           207            0.0          1.12  ...........  ............
Comorbidity: Oncology Treatment...........            10            0.0          1.44  ...........  ............
Comorbidity: Poisoning....................         5,436            0.8          1.16  ...........  ............
Comorbidity: Renal Failure, Acute.........        17,466            2.5          1.06  ...........  ............
Comorbidity: Renal Failure, Chronic.......        42,544            6.0          1.08  ...........  ............

[[Page 37644]]

 
Comorbidity: Severe Musculoskeletal &              3,765            0.5          1.05  ...........  ............
 Connective Tissue Disease................
Comorbidity: Severe Protein Malnutrition..         4,907            0.7          1.17  ...........  ............
Comorbidity: Tracheostomy.................           260            0.0          1.09  ...........  ............
Comorbidity: Uncontrolled Diabetes........        20,001            2.8          1.05  ...........  ............
Comorbidity: Intensive Management for High-       18,815            2.7          1.07  ...........  ............
 Risk Behavior............................
Ages: Under 45............................       208,334           29.6          1.00  ...........  ............
Ages: 45 and under 55 years...............       102,694           14.6          1.02  ...........  ............
Ages: 55 and under 60 years...............        61,728            8.8          1.05  ...........  ............
Ages: 60 and under 65 years...............        58,702            8.3          1.06  ...........  ............
Ages: 65 and under 70 years...............        83,972           11.9          1.09  ...........  ............
Ages: 70 and under 80 years...............       113,411           16.1          1.11  ...........  ............
Ages: 80 years and over...................        75,631           10.7          1.13  ...........  ............
Length of stay--1 day.....................        15,429            2.2          1.28  ...........  ............
Length of stay--2 days....................        24,436            3.5          1.20  ...........  ............
Length of stay--3 days....................        36,245            5.1          1.15  ...........  ............
Length of stay--4 days....................        41,061            5.8          1.12  ...........  ............
Length of stay--5 days....................        46,857            6.7          1.08  ...........  ............
Length of stay--6 days....................        50,853            7.2          1.06  ...........  ............
Length of stay--7 days....................        54,636            7.8          1.03  ...........  ............
Length of stay--8 days....................        44,677            6.3          1.02  ...........  ............
Length of stay--9 days....................        36,935            5.2          1.01  ...........  ............
Length of stay--10 days...................        33,644            4.8          1.00  ...........  ............
Length of stay--11 days...................        30,418            4.3          1.00  ...........  ............
Length of stay--12 days...................        28,017            4.0          1.00  ...........  ............
Length of stay--13 days...................        28,089            4.0          1.00  ...........  ............
Length of stay--14 days...................        30,556            4.3          1.00  ...........  ............
Length of stay--15 days...................        21,953            3.1          1.00  ...........  ............
Length of stay--16 days...................        16,502            2.3          1.00  ...........  ............
Length of stay--17 days...................        14,126            2.0          1.00  ...........  ............
Length of stay--18 days...................        12,300           1.7%          1.00  ...........  ............
Length of stay--19 days...................        11,467            1.6          1.00  ...........  ............
Length of stay--20 days...................        11,702            1.7          1.00  ...........  ............
Length of stay--21 days...................        11,018            1.6          1.00  ...........  ............
Length of stay--22 days or longer.........       103,551           14.7          1.00  ...........  ............
----------------------------------------------------------------------------------------------------------------

4. Wage Index Adjustment
a. Background
    As discussed in the RY 2007 IPF PPS final rule (71 FR 27061), and 
the RY 2009 IPF PPS (73 FR 25719) and RY 2010 IPF PPS notices (74 FR 
20373), to provide an adjustment for geographic wage levels, the labor-
related portion of an IPF's payment is adjusted using an appropriate 
wage index. Currently, an IPF's geographic wage index value is 
determined based on the actual location of the IPF in an urban or rural 
area, as defined in Sec.  412.64(b)(1)(ii)(A) and (C).
    Due to the variation in costs and because of the differences in 
geographic wage levels, in the RY 2005 IPF PPS final rule, we required 
that payment rates under the IPF PPS be adjusted by a geographic wage 
index. We proposed and finalized a policy to use the unadjusted, pre-
floor, pre-reclassified IPPS hospital wage index to account for 
geographic differences in IPF labor costs. We implemented use of the 
pre-floor, pre-reclassified IPPS hospital wage data to compute the IPF 
wage index since there was not an IPF-specific wage index available. We 
believe that IPFs generally compete in the same labor market as IPPS 
hospitals, and therefore, the pre-floor, pre-reclassified IPPS hospital 
wage data should be reflective of labor costs of IPFs. We believe this 
pre-floor, pre-reclassified IPPS hospital wage index to be the best 
available data to use as proxy for an IPF-specific wage index. As 
discussed in the RY 2007 IPF PPS final rule (71 FR 27061 through 
27067), under the IPF PPS, the wage index is calculated using the IPPS 
wage index for the labor market area in which the IPF is located, 
without considering geographic reclassifications, floors, and other 
adjustments made to the wage index under the IPPS. For a complete 
description of these IPPS wage index adjustments, we refer readers to 
the FY 2019 IPPS/LTCH PPS final rule (83 FR 41362 through 41390). Our 
wage index policy at Sec.  412.424(a)(2) provides that we use the best 
Medicare data available to estimate costs per day, including an 
appropriate wage index to adjust for wage differences.
    When the IPF PPS was implemented in the RY 2005 IPF PPS final rule, 
with an effective date of January 1, 2005, the pre-floor, pre-
reclassified IPPS hospital wage index that was available at the time 
was the FY 2005 pre-floor, pre-reclassified IPPS hospital wage index. 
Historically, the IPF wage index for a given RY has used the pre-floor, 
pre-reclassified IPPS hospital wage index from the prior FY as its 
basis. This has been due in part to the pre-floor, pre-reclassified 
IPPS hospital wage index data that were available during the IPF 
rulemaking cycle, where an annual IPF notice or IPF final rule was 
usually published in early May. This publication timeframe was 
relatively early compared to other Medicare payment rules because the 
IPF PPS follows a RY, which was defined in the implementation of the 
IPF PPS as the 12-month period from July 1 to June 30 (69 FR 66927). 
Therefore, the best available data at the time the IPF PPS was 
implemented was the pre-floor, pre-reclassified IPPS hospital wage 
index from the prior FY (for example, the RY 2006 IPF wage index was 
based on the

[[Page 37645]]

FY 2005 pre-floor, pre-reclassified IPPS hospital wage index).
    In the RY 2012 IPF PPS final rule, we changed the reporting year 
timeframe for IPFs from a RY to FY, which begins October 1 and ends 
September 30 (76 FR 26434 and 26435). In that FY 2012 IPF PPS final 
rule, we continued our established policy of using the pre-floor, pre-
reclassified IPPS hospital wage index from the prior year (that is, 
from FY 2011) as the basis for the FY 2012 IPF wage index. This policy 
of basing a wage index on the prior year's pre-floor, pre-reclassified 
IPPS hospital wage index has been followed by other Medicare payment 
systems, such as hospice and inpatient rehabilitation facilities. By 
continuing with our established policy, we remained consistent with 
other Medicare payment systems.
    In FY 2020, we finalized the IPF wage index methodology to align 
the IPF PPS wage index with the same wage data timeframe used by the 
IPPS for FY 2020 and subsequent years. Specifically, we finalized the 
use of the pre-floor, pre-reclassified IPPS hospital wage index from 
the FY concurrent with the IPF FY as the basis for the IPF wage index. 
For example, the FY 2020 IPF wage index was based on the FY 2020 pre-
floor, pre-reclassified IPPS hospital wage index rather than on the FY 
2019 pre-floor, pre-reclassified IPPS hospital wage index.
    We explained in the FY 2020 proposed rule (84 FR 16973), that using 
the concurrent pre-floor, pre-reclassified IPPS hospital wage index 
will result in the most up-to-date wage data being the basis for the 
IPF wage index. We noted that it would also result in more consistency 
and parity in the wage index methodology used by other Medicare payment 
systems. We indicated that the Medicare skilled nursing facility (SNF) 
PPS already used the concurrent IPPS hospital wage index data as the 
basis for the SNF PPS wage index. We proposed and finalized similar 
policies to use the concurrent pre-floor, pre-reclassified IPPS 
hospital wage index data in other Medicare payment systems, such as 
hospice and inpatient rehabilitation facilities. Thus, the wage 
adjusted Medicare payments of various provider types are based upon 
wage index data from the same timeframe. For FY 2026, we proposed to 
continue to use the concurrent pre-floor, pre-reclassified IPPS 
hospital wage index as the basis for the IPF wage index.
    In the FY 2023 IPF PPS final rule (87 FR 46856 through 46859), we 
finalized a permanent 5-percent cap on any decrease to a provider's 
wage index from its wage index in the prior year, and we stated that we 
will apply this cap in a budget neutral manner. In addition, we 
finalized a policy that a new IPF will be paid the wage index for the 
area in which it is geographically located for its first full or 
partial FY with no cap applied because a new IPF will not have a wage 
index in the prior FY. We amended the IPF PPS regulations at Sec.  
412.424(d)(1)(i) to reflect this permanent cap on wage index decreases. 
We refer readers to the FY 2023 IPF PPS final rule for a more detailed 
discussion about this policy.
    In the FY 2026 IPF PPS proposed rule, we proposed to apply the IPF 
wage index adjustment to the labor-related share of the national IPF 
PPS base rate and ECT payment per treatment. As discussed in section 
IV.A.3 of this final rule, the final labor-related share of the IPF PPS 
national base rate and ECT payment per treatment is 79.0 percent in FY 
2026. This percentage reflects the labor-related share relative 
importance of the 2021-based IPF market basket for FY 2026 and is 0.2 
percentage point higher than the FY 2025 labor-related share.
    The following is a summary of the comments we received on the 
proposed wage index adjustment and our responses.
    Comment: A commenter recommended CMS apply the wage index 5-percent 
cap in a non-budget neutral manner.
    Response: We did not propose any new policies this year pertaining 
to the 5-percent cap, and accordingly, we are not finalizing any new 
policies in this final rule. In accordance with our longstanding policy 
under the IPF PPS, we updated the wage index in such a way that total 
estimated payments to IPFs for FY 2026 are the same with or without the 
changes (that is, in a budget-neutral manner) by applying a budget 
neutrality factor to the IPF PPS rates. We applied the wage index cap 
in a budget-neutral manner in accordance with this overall budget 
neutrality policy for the IPF PPS wage index so that wage index changes 
do not increase aggregate Medicare spending. In the FY 2023 IPF PPS 
proposed rule (87 FR 19423 through 19425), we noted that applying a 5-
percent cap on all wage index decreases would have a very small effect 
on the wage index budget neutrality factor for FY 2023. We explained 
that we anticipate that in the absence of proposed policy changes, most 
providers will not experience year to-year wage index declines greater 
than 5 percent in any given year and that we expect the impact to the 
wage index budget neutrality factor in future years will continue to be 
minimal.
    Comment: Two commenters requested CMS revise the IPF wage index 
methodology. Specifically, the commenters suggested CMS revise the 
policy so that the post-reclassification and post-floor hospital IPPS 
wage index is used to calculate the wage index for IPFs. The commenter 
stated that the continued use of the pre-reclassification and pre-floor 
hospital inpatient wage index is unreasonable because it places IPFs at 
a disadvantage in the labor markets in which they operate relative to 
hospitals in the same markets. In addition, a commenter urged CMS to 
apply an out-migration adjustment to IPFs to account for the employment 
of hospital employees who reside in one county but commute to work in a 
county with a higher wage index.
    Response: We appreciate the commenters' recommendations. We did not 
propose the specific policies suggested by commenters, but we will take 
these recommendations into consideration to potentially inform future 
rulemaking. We do not believe that the continued use of the pre-
reclassification and pre-floor hospital inpatient wage index for FY 
2026 is unreasonable or that this policy puts IPFs at a disadvantage 
relative to hospitals in the labor markets in which they operate. As we 
have previously discussed in the RY 2007 final rule (71 FR 27066), we 
believe that the actual location of an IPF (as opposed to the location 
of affiliated providers) is most appropriate for determining the wage 
adjustment because the prevailing wages in the area in which the IPF is 
located influence the cost of a case. In that same RY 2007 final rule 
(71 FR 27066), we also stated that we believe the ``rural floor'' is 
required only for the acute care hospital payment system because 
section 4410 of the Balanced Budget Act of 1997 (Pub. L. 105-33) 
applies specifically to acute care hospitals and not excluded hospitals 
and excluded units. As we have previously discussed, the IPF wage index 
is intended to be a relative measure of the value of labor in 
prescribed labor market areas (87 FR 46857). There are a variety of 
reasons why our longstanding IPF wage index policy have not applied 
floors or reclassifications, which, as we previously noted, are not 
applied to the IPF wage index by statute. For example, applying floors 
and reclassifications to the IPF wage index would significantly 
increase administrative burden, both for IPFs and for CMS, associated 
with IPFs reclassifying from one CBSA to another, and it would 
significantly increase the

[[Page 37646]]

complexity of the methodology. Furthermore, because floors and 
reclassifications would be applied budget-neutrally under the wage 
index, these policies would increase the wage index for some IPFs while 
reducing IPF PPS payments for all other IPFs, which would upset the 
long-settled expectations with which IPFs across the country have been 
operating. For these reasons, we believe using the pre-floor, pre-
reclassified IPPS hospital wage index is the most appropriate data to 
use as a proxy for an IPF wage index. We appreciate the commenter's 
suggestion to apply an out-migration adjustment to IPFs to account for 
employment of hospital staff who commute to work in counties with a 
higher wage index. However, we note that the out-migration adjustment 
is applied to the IPPS hospital wage index under section 1886(d)(13) of 
the Act, which is a statutory provision that specifically applies to 
subsection (d) hospitals paid under the IPPS. As discussed in the prior 
paragraph, we do not believe it is appropriate for the IPF PPS to apply 
an out-migration adjustment that is not statutorily required, because 
such a policy would increase administrative burden and have 
distributional impacts on IPFs.
    Final Decision: After consideration of the comments received, we 
are finalizing our proposal for FY 2026 to continue to use the 
concurrent pre-floor, pre-reclassified IPPS hospital wage index as the 
basis for the IPF wage index. We will apply the IPF wage index 
adjustment to the labor-related share of the national base rate and ECT 
payment per treatment. The labor-related share of the national rate and 
ECT payment per treatment will change from 78.8 percent in FY 2025 to 
79.0 percent in FY 2026. This percentage reflects the labor-related 
share of the 2021-based IPF market basket for FY 2026 (see section 
IV.A.3 of this final rule).
b. Office of Management and Budget (OMB) Bulletins
    The wage index used for the IPF PPS is calculated using the 
unadjusted, pre-reclassified and pre-floor IPPS wage index data and is 
assigned to the IPF based on the labor market area in which the IPF is 
geographically located. IPF labor market areas are delineated based on 
the Core-Based Statistical Area (CBSAs) established by the OMB.
    Generally, OMB issues major revisions to statistical areas every 10 
years, based on the results of the decennial census. However, OMB 
occasionally issues minor updates and revisions to statistical areas in 
the years between the decennial censuses through OMB Bulletins. These 
bulletins contain information regarding CBSA changes, including changes 
to CBSA numbers and titles. In accordance with our established 
methodology, the IPF PPS has historically adopted any CBSA changes that 
are published in the OMB bulletin that corresponds with the IPPS 
hospital wage index used to determine the IPF wage index and, when 
necessary and appropriate, has proposed and finalized transition 
policies for these changes.
    In the RY 2007 IPF PPS final rule (71 FR 27061 through 27067), we 
adopted the changes discussed in OMB Bulletin No. 03-04 (June 6, 2003), 
which announced revised definitions for Metropolitan Statistical Areas 
(MSAs), and the creation of Micropolitan Statistical Areas and Combined 
Statistical Areas. We refer readers to the FY 2007 IPF PPS final rule 
(71 FR 27064 and 27065) for a complete discussion regarding treating 
Micropolitan Areas as rural. In adopting the OMB CBSA geographic 
designations in RY 2007, we did not provide a separate transition for 
the CBSA-based wage index since the IPF PPS was already in a transition 
period from TEFRA payments to PPS payments.
    In the RY 2009 IPF PPS notice, we incorporated the CBSA 
nomenclature changes published in the most recent OMB bulletin that 
applied to the IPPS hospital wage index used to determine the current 
IPF wage index and stated that we expected to continue to do the same 
for all the OMB CBSA nomenclature changes in future IPF PPS rules and 
notices, as necessary (73 FR 25721).
    Subsequently, CMS adopted the changes that were published in past 
OMB bulletins in the FY 2016 IPF PPS final rule (80 FR 46682 through 
46689), the FY 2018 IPF PPS rate update (82 FR 36778 and 36779), the FY 
2020 IPF PPS final rule (84 FR 38453 and 38454), and the FY 2021 IPF 
PPS final rule (85 FR 47051 through 47059). We direct readers to each 
of these rules for more information about the changes that were adopted 
and any associated transition policies.
    As discussed in the FY 2023 IPF PPS final rule, we did not adopt 
OMB Bulletin 20-01, which was issued March 6, 2020, because we 
determined this bulletin had no material impact on the IPF PPS wage 
index. This bulletin creates only one Micropolitan statistical area, 
and Micropolitan areas are considered rural for the IPF PPS wage index. 
That is, the constituent county of the new Micropolitan area was 
considered rural effective as of FY 2021 and would continue to be 
considered rural if we adopted OMB Bulletin 20-01.
    In the FY 2025 IPF PPS final rule (89 FR 64614 through 64633), we 
adopted the updates set forth in OMB Bulletin No. 23-01 effective July 
21, 2023, beginning with the FY 2025 IPF PPS wage index. These updates 
included material changes to the OMB statistical area delineations, 
which included 53 urban counties that became rural, 54 rural counties 
that became urban, and 88 counties that moved to a new or modified 
CBSA. These updates also included replacing the 8 counties in 
Connecticut with 9 new ``Planning Regions.'' Planning regions now serve 
as county-equivalents within the CBSA system. OMB Bulletin No. 23 may 
be accessed online at <a href="https://www.whitehouse.gov/wp-content/uploads/2023/07/OMB-Bulletin-23-01.pdf">https://www.whitehouse.gov/wp-content/uploads/2023/07/OMB-Bulletin-23-01.pdf</a>.
    Given the scope of changes involved in adopting the CBSA 
delineations for FY 2025, we finalized a budget neutral 3-year phase 
out policy for IPFs transitioning from rural to urban based on CBSA 
revisions, as discussed further in section IV.D.5.c of this final rule. 
We also applied the permanent 5-percent cap on wage index decreases 
described at Sec.  412.424(d)(1)(i).
c. Wage Index Budget Neutrality Adjustment
    In accordance with Sec.  412.424(c)(5), changes to the wage index 
are made in a budget neutral manner so that updates do not increase 
expenditures. Therefore, for FY 2026, we are continuing to apply a 
budget neutrality adjustment in accordance with our existing budget 
neutrality policy. This policy requires us to update the wage index in 
such a way that total estimated payments to IPFs for FY 2026 are the 
same with or without the changes (that is, in a budget neutral manner) 
by applying a budget neutrality factor to the IPF PPS rates. We will 
use the following steps to ensure that the rates reflect the FY 2026 
update to the wage indexes (based on FY 2022 hospital cost report data) 
and the labor-related share in a budget-neutral manner:
    Step 1: Simulate estimated IPF PPS payments, using the FY 2025 IPF 
wage index values (available on the CMS website) and labor-related 
share (as published in the FY 2025 IPF PPS final rule (89 FR 64582)).
    Step 2: Simulate estimated IPF PPS payments using the FY 2026 IPF 
wage index values (available on the CMS website), and the FY 2026 
labor-related share (based on the latest available data as discussed 
previously).

[[Page 37647]]

    Step 3: Divide the amount calculated in step 1 by the amount 
calculated in step 2. The resulting quotient is the FY 2026 budget 
neutral wage adjustment factor of 1.0011.
    Step 4: Apply the FY 2026 budget neutral wage adjustment factor 
from step 3 to the FY 2025 IPF PPS Federal per diem base rate after the 
application of the final IPF market basket increase reduced by the 
final productivity adjustment described in section IV.A.2 of this final 
rule to determine the final FY 2026 IPF PPS Federal per diem base rate. 
As discussed in section IV.D.9 of this final rule, we are also applying 
a refinement standardization factor to determine the FY 2026 IPF PPS 
Federal per diem base rate.
5. Adjustment for Rural Location
a. Background
    In the RY 2005 IPF PPS final rule (69 FR 66954), we provided a 17-
percent payment adjustment for IPFs located in a rural area. This 
adjustment was based on the regression analysis, which indicated that 
the per diem cost of rural facilities was 17 percent higher than that 
of urban facilities after accounting for the influence of the other 
variables included in the regression. This 17-percent adjustment has 
been part of the IPF PPS each year since the inception of the IPF PPS. 
In the FY 2025 IPF PPS final rule, we revised the patient-level 
adjustment factors and changed the CBSA delineations. To minimize the 
scope of changes that would impact providers in any single year, we 
maintained the existing regression-derived adjustment factor, which was 
established in RY 2005, for IPFs located in a rural area as defined at 
Sec.  412.64(b)(1)(ii)(C) for FY 2025. See the RY 2005 IPF PPS final 
rule (69 FR 66954) for a complete discussion of the adjustment for 
rural locations.
b. Adjustment for Rural Location
    As discussed in section IV.D.3. of this FY 2026 IPF PPS final rule, 
we have completed analysis of more recent cost and claims data, which 
indicate that revisions to the facility-level IPF PPS payment 
adjustment factors would be appropriate.
    In the FY 2025 IPF PPS proposed rule, we included a request for 
information (RFI) regarding a potential revision to the payment 
adjustment for rural location (89 FR 23194 and 23195); we refer readers 
to section V.A. of the FY 2025 IPF PPS final rule (89 FR 64641) for 
summaries of the comments we received, and our responses. In the FY 
2026 IPF PPS proposed rule, we explained that we took the comments 
received into consideration for development of the proposed FY 2026 
revision of the payment adjustment for rural location.
    As discussed in section IV.D.3. of this FY 2026 IPF PPS final rule, 
we proposed to derive updated IPF PPS facility-level adjustment factors 
for FY 2026 using a regression analysis of data from the FY 2020 
through 2022 MedPAR data files and Medicare cost report data from the 
FY 2020 through 2022 Hospital Cost Report Information System (HCRIS). 
More information about the data used for the impact simulations is 
found in section VII.C. of this FY 2026 IPF PPS final rule.
    For FY 2026, we proposed to increase the rural adjustment to 18 
percent. Our regression analysis described in section IV.D.3 of this 
final rule indicates that this revised adjustment more accurately 
represents the difference in costs between urban and rural IPFs. As 
discussed in section IV.D.9 of this final rule, we proposed to 
implement this revision to the rural adjustment budget-neutrally. A 
detailed discussion of the distributional impacts of this change is 
found in section VII.C. of this final rule.
    We solicited comments on the proposed revision to the payment 
adjustment for rural location. Lastly, we proposed that if more recent 
data become available, we would consider using such data to determine 
the final FY 2026 adjustment factor for rural location. As discussed in 
section IV.D.3 of this final rule, our updated regression analysis for 
this final rule incorporated more recent claims data. The regression 
analysis of this updated data yields an FY 2026 adjustment factor for 
rural location of 18 percent; this result is consistent with the rural 
adjustment factor we proposed for FY 2026.
    The following is a summary of the comments we received and our 
responses.
    Comment: Several commenters supported the update of the adjustment 
factor for rural location. A commenter appreciated this update to 
reflect more recent data, completing the updates of both patient-level 
and facility-level adjustment factors in FY 2025 and in this final 
rule.
    A commenter advocated for a larger increase to 20 percent or more 
to be implemented with new funding; another suggested that the proposed 
update to 18 percent be implemented non-budget neutrally to avoid 
lowering payments for urban facilities. Commenters also suggested 
exploring policy alternatives like a low-volume adjustment, a small 
facility supplemental payment, or extension of the rural designation 
and payment adjustment to all safety net facilities.
    Response: We appreciate the commenters' support for updating the 
adjustment factor for rural location. We share the commenters' concerns 
regarding protecting access to inpatient psychiatric care in rural 
areas but note that our regression analysis does not support an 
adjustment of 20 percent. We additionally note that section 
1886(s)(5)(D)(iii) of the Act requires that revisions to the IPF PPS 
payment rates implemented pursuant to section 1886(s)(5)(D)(i) of the 
Act be made budget neutrally. We thank commenters for their policy 
suggestions for improving the IPF PPS and will take these suggestions 
into consideration as we continue to analyze and revise the IPF PPS in 
future years.
    Final Decision: After consideration of the comments, we are 
finalizing an increase in the rural adjustment to 18 percent as 
proposed. Our regression analysis described in section IV.D.3 of this 
final rule indicates that this increased adjustment more accurately 
represents the difference in costs between urban and rural IPFs. This 
revision to the rural adjustment will be implemented budget-neutrally, 
as proposed. A detailed discussion of the distributional impacts of 
this change is found in section VII.C. of this final rule.
c. Continuation of Rural Transition
    The adoption of OMB Bulletin No. 23-01 in the FY 2025 IPF PPS final 
rule (89 FR 64632) in accordance with our established methodology 
determines whether a facility is classified as urban or rural for 
purposes of the rural payment adjustment in the IPF PPS. Implementation 
of the updated OMB delineations results in the rural payment adjustment 
being applied where it is appropriate to adjust for higher costs 
incurred by IPFs in rural locations; however, these changes have 
distributional effects among IPF providers. Some providers lost 
eligibility for the rural payment adjustment in FY 2025 as a result of 
these changes. Therefore, we provided a transition period to implement 
the updated OMB delineations (89 FR 64633).
    In the FY 2025 IPF PPS final rule, we phased out the rural 
adjustment for facilities located in a county that transitioned from 
rural to urban due to the changes outlined in OMB Bulletin 23-01. We 
implemented a 3-year budget neutral phase-out of the rural adjustment 
for IPFs located in the 54 rural counties that would become urban under 
the new OMB delineations, given the potentially significant payment

[[Page 37648]]

impacts for these IPFs (89 FR 64632 and 64633), consistent with the 
transition policy we adopted for IPFs in FY 2016 (80 FR 46682 through 
46689). Under this 3-year phase-out, for FY 2026, IPFs that became 
urban due to these OMB delineation changes will receive one-third of 
the rural adjustment that was applicable in FY 2024. For FY 2027, these 
IPFs will not receive a rural adjustment.
6. Teaching Adjustment
a. Background
    In the RY 2005 IPF PPS final rule, we implemented regulations at 
Sec.  412.424(d)(1)(iii) to establish a facility-level adjustment for 
IPFs that are, or are part of, teaching hospitals (69 FR 66954 through 
66957). The teaching adjustment accounts for the higher indirect 
operating costs experienced by hospitals that participate in graduate 
medical education (GME) programs. As detailed further in the following 
paragraphs, the payment adjustments are made based on the ratio of the 
number of fulltime equivalent (FTE) interns and residents training in 
the IPF to the IPF's average daily census.
    Medicare makes direct GME payments (for direct costs such as 
resident and teaching physician salaries, and other direct teaching 
costs) to all teaching hospitals, including those paid under a PPS and 
those paid under the TEFRA rate-of-increase limits. These direct GME 
payments are made separately from payments for hospital operating costs 
and are not part of the IPF PPS. The direct GME payments do not address 
the estimated higher indirect operating costs teaching hospitals may 
face.
    The results of the regression analysis of FY 2002 IPF data 
established the basis for the payment adjustments included in the RY 
2005 IPF PPS final rule. The results showed that the indirect teaching 
cost variable is significant in explaining the higher costs of IPFs 
that have teaching programs. We calculated the teaching adjustment 
based on the IPF's ``teaching variable,'' which is (1 + [the number of 
FTE residents training in the IPFs divided by the IPF's average daily 
census]). The teaching variable is then raised to the 0.5150 power, 
resulting in the IPF PPS teaching adjustment. This formula is subject 
to limitations on the number of FTE residents, which are discussed in 
greater detail in this final rule at section IV.D.6.c.
    We established the teaching adjustment in a manner that limited the 
incentives for IPFs to add FTE residents for the purpose of increasing 
their teaching adjustment. We imposed a cap on the number of FTE 
residents that may be counted for purposes of calculating the teaching 
adjustment. The cap limits the number of FTE residents that teaching 
IPFs may count for the purpose of calculating the IPF PPS teaching 
adjustment, not the number of residents teaching institutions can hire 
or train. We calculated the number of FTE residents that trained in the 
IPF during a ``base year'' and used that FTE resident number as the 
cap. An IPF's FTE resident cap is ultimately determined based on the 
final settlement of the IPF's most recent cost report filed before 
November 15, 2004 (69 FR 66955). A complete discussion of the temporary 
adjustment to the FTE cap to reflect residents due to hospital closure 
or residency program closure appears in the RY 2012 IPF PPS proposed 
rule (76 FR 5018 through 5020) and the RY 2012 IPF PPS final rule (76 
FR 26453 through 26456). As discussed in section IV.D.6.c. of this 
final rule, we proposed to make conforming changes to the IPF resident 
cap policy beginning in FY 2026 to recognize permanent cap increases 
awarded under section 4122 of the CAA, 2023.
    In the regression analysis that informed the RY 2004 IPF PPS final 
rule, the logarithm of the teaching variable had a coefficient value of 
0.5150. We converted this cost effect into a teaching payment 
adjustment by treating the regression coefficient as an exponent and 
raising the teaching variable to a power equal to the coefficient 
value. We note that the coefficient value of 0.5150 was based on the 
regression analysis holding all other components of the payment system 
constant. A complete discussion of how the teaching adjustment was 
calculated appears in the RY 2005 IPF PPS final rule (69 FR 66954 
through 66957) and the RY 2009 IPF PPS notice (73 FR 25721).
b. Revision to the IPF PPS Teaching Adjustment
    As we previously described in section IV.D.3.e. of this final rule, 
we have completed analysis of more recent cost and claims data, which 
indicate that revisions to the facility-level IPF PPS payment 
adjustment factors would be appropriate. Accordingly, we proposed to 
revise the IPF PPS teaching adjustment for FY 2026 based on these 
results.
    In the FY 2025 IPF PPS proposed rule, we included an RFI regarding 
a potential revision to the payment adjustment for teaching status (89 
FR 23194 and 23195); we refer readers to section V.A. of the FY 2025 
IPF PPS final rule (89 FR 64641) for summaries of the comments we 
received, and our responses. In general, commenters were supportive of 
increasing the IPF teaching adjustment based on the more recent 
analysis presented in that FY 2025 proposed rule. In the FY 2026 IPF 
PPS proposed rule, we explained that we took these previous comments 
into consideration when we developed our proposal for the FY 2026 
revision of the payment adjustment for teaching status.
    For FY 2026, we proposed to increase the teaching adjustment to 
0.7981, based on the results of our latest regression model (90 FR 
18494, 18510). We explained that this un-exponentiated regression 
coefficient for the teaching status variable was found to be 
statistically significant at the 0.001 level. We stated that in 
accordance with our longstanding methodology, we would convert this 
cost effect to a teaching payment adjustment by treating the regression 
coefficient as an exponent and raising the teaching variable to a power 
equal to the coefficient value. In the FY 2026 IPF PPS proposed rule, 
we stated that we believe increasing the teaching adjustment from 
0.5150 to 0.7981 would more appropriately adjust IPF PPS payments for 
IPFs that have qualified teaching programs and would address the 
estimated higher indirect operating costs for teaching IPFs (90 FR 
18494, 18511). As discussed in section IV.D.9 of this final rule, we 
proposed to implement this revision to the teaching adjustment budget-
neutrally. A detailed discussion of the distributional impacts of this 
change is found in section VII.C. of this final rule.
    We solicited comments on this proposed revision to the payment 
adjustment for teaching status. Lastly, we proposed that, if more 
recent data were to become available, we would consider using such data 
to determine the final FY 2026 adjustment factor for teaching status. 
The following is a summary of the comments we received and our 
responses.
    Comment: Commenters were supportive of CMS's proposal to increase 
the IPF PPS teaching status adjustment from 0.5150 to 0.7981. A 
commenter noted that the teaching adjustment presently in use was 
derived from 2002 data and stated their support for an update using 
more recent data.
    Response: We appreciate these comments in support of an update to 
the teaching status adjustment. As discussed in section IV.D.3.e. of 
this FY 2026 IPF PPS final rule, we note that we have revised our 
regression model for FY 2026 based on the latest available

[[Page 37649]]

cost and claims data, as proposed. We believe the results of our latest 
regression model best address the estimated higher indirect operating 
costs for teaching IPFs and will most appropriately adjust IPF PPS 
payments for IPFs that have qualified teaching programs.
    Comment: Some commenters who expressed support for the update to 
the teaching adjustment nevertheless expressed concerns about payment 
stability. A commenter stated that the proposed increase to the 
adjustment for teaching could lead to large swings in payment. A 
commenter stated that the proposed changes to the teaching and rural 
adjustment factors together would necessitate an adjustment of nearly 
three-quarters of 1 percentage point, for budget neutrality. These 
commenters suggested the adjustment be phased in over 2 years to 
mitigate negative distributional impacts on payments to non-teaching 
hospitals.
    Response: We thank the commenters for the suggestion to phase in 
the proposed increase to the teaching adjustment over 2 years. Given 
the requirement under section 1886(s)(5)(D)(3) of the Act to apply 
revisions to the IPF PPS budget-neutrally, we estimate that the 
proposed increase to the teaching adjustment would result in 
distributional impacts across IPFs. However, we note that the total 
effect of the proposed facility-level revisions (to the adjustments for 
both rural location and teaching status) is a reduction of only $6.56 
to the final FY 2026 IPF PPS Federal per diem base rate, which we 
believe IPFs have historically been able to adapt to in a single year.
    Moreover, our analysis indicates that the largest decrease any 
provider will experience as a result of the increase in the teaching 
adjustment is 0.6 percent. By comparison, we have historically 
considered a 5 percent decrease (in a provider's wage index, for 
example), to be a level at which a policy limiting the decrease should 
be considered. We do not agree that the effect of the increase in the 
teaching adjustment on the base rate is substantial enough to warrant 
phasing in over 2 years. Additionally, we note that our latest analysis 
shows that IPFs with teaching programs have significantly higher costs 
than our current teaching adjustment recognizes. We believe that 
implementing the full revised teaching adjustment in FY 2026 would best 
support teaching facilities by more appropriately aligning IPF PPS 
payment with the level of resources involved in the delivery of care to 
Medicare beneficiaries.
    Comment: Several commenters called for additional measures to 
expand the workforce in psychiatry and other clinicians providing 
mental health services. A few commenters broadly advocated for more 
training programs, training slots, and funding. Another commenter 
recommended that CMS consider complementary strategies that would 
support development of the IPF workforce at non-teaching hospitals, 
which could include incentive payments or launching a demonstration 
project at non-teaching hospitals to support new psychiatry residency 
rotations or training for non-physician practitioners.
    Response: We appreciate the commenters' suggestions; however, these 
comments are out of scope with regard to the current IPF PPS proposal. 
We will consider these suggestions to potentially inform future 
rulemaking.
    Final Decision: After consideration of the comments we received, we 
are finalizing a teaching adjustment of 0.7957 for FY 2026 based on the 
latest available data. In accordance with our longstanding methodology, 
we will convert this cost effect to a teaching payment adjustment by 
treating the regression coefficient as an exponent and raising the 
teaching variable to a power equal to the coefficient value. This 
revision to the rural adjustment will be implemented budget-neutrally.
c. Update to IPF PPS Resident Caps
    As we described earlier in this FY 2026 IPF PPS final rule, the IPF 
PPS teaching adjustment includes a policy of capping the number of FTE 
residents that an IPF can include in the calculation of its teaching 
adjustment. As previously noted, we established this policy to limit 
the incentives for IPFs to add FTE residents for the purpose of 
increasing their teaching adjustment, in keeping with CMS's statutory 
responsibility under the requirements of the Balanced Budget Act of 
1997 (BBA) (Pub. L. 105-33). In the RY 2005 IPF PPS final rule (69 FR 
66955), we noted that the IPF PPS statute did not require us to impose 
resident FTE caps, but we recognized that if we imposed no limits on 
the teaching adjustment under the IPF PPS, teaching programs in those 
facilities could grow and receive payments in a manner that would be 
inconsistent with the methodology for teaching hospitals paid under the 
IPPS. In addition, we were concerned that if a teaching hospital had a 
distinct part psychiatric unit and had a number of FTE residents above 
the amount recognized for reimbursement under the limits established by 
the Balanced Budget Act of 1997 (BBA) (Pub. L. 105-33), the hospital 
could potentially circumvent those limits by assigning residents to 
train in the IPF. We explained that after carefully reviewing the 
public comments, we decided to adopt a cap on the number of FTE 
residents that may be counted under the IPF PPS for the teaching 
adjustment. We stated that we made this decision in order to (1) 
exercise our statutory responsibility under the BBA to prevent any 
erosion of the resident caps established under the IPPS that could 
result from the perverse incentives created by the facility adjustment 
for teaching under the IPF PPS; and (2) avoid creating incentives to 
artificially expand residency training in IPFs, and ensure that the 
resident base used to determine payments is related to the care needs 
in IPF institutions.
    Since the establishment of the IPF PPS, there have been numerous 
statutory resident cap increases, which have impacted GME payments as 
well as IME payments under the IPPS. These statutory resident cap 
increases have generally not been applicable to IPF hospitals or 
subunits, because caps are awarded to IPPS hospitals which receive both 
direct GME payments and indirect medical education (IME) payments under 
the IPPS.
    Section 4122 of the CAA, 2023 provided for the distribution of at 
least 100 resident FTEs to be distributed for hospitals with a 
psychiatry or psychiatry subspecialty residency, which the CAA, 2023 
defines as a residency in psychiatry as accredited by the Accreditation 
Council for Graduate Medical Education for the purpose of preventing, 
diagnosing, and treating mental health disorders. Hospitals with a 
psychiatry or psychiatry subspecialty residency could include not only 
acute care hospitals paid under the IPPS, but also freestanding 
psychiatric hospitals paid under the IPF PPS.
    The CAA, 2023 also included a provision for IME payments under the 
IPPS, which stated that for discharges occurring on or after July 1, 
2026, insofar as an additional payment amount under section 4122 is 
attributable to resident positions distributed to a hospital that is 
identified under subsection (h)(10), the indirect teaching adjustment 
factor would be computed in the same manner as provided under section 
1886(d)(5)(B)(ii) with respect to such resident positions (in other 
words, utilizing 1.35 as the value of ``c'' in the adjustment formula). 
We note that IPF hospitals paid under the IPF PPS are not considered a 
hospital under subsection (h)(10) and do not receive IME

[[Page 37650]]

payments paid under the IPPS, under section 1886(d)(5)(B) of the Act.
    Historically, the IPF PPS teaching adjustment at Sec.  412.424 has 
not recognized permanent resident cap increases, which, as we noted 
earlier, have historically impacted GME payments and IME payments under 
the IPPS. However, current regulations at Sec.  412.424(d)(1)(iii)(D) 
allow for an adjustment to an IPF's resident FTE cap for a new approved 
GME program. When we initially established this regulation in the RY 
2005 IPF PPS final rule (69 FR 66955 and 66956), we explained that for 
new teaching IPFs and for teaching IPFs that start new programs, we 
were adopting the policy that was applied under the BBA for IPPS 
teaching hospitals that start new teaching programs as specified in 
Sec.  413.79(e)(1). We noted that under Sec.  412.105(f)(1)(vi) 
concerning IME payments under the IPPS, hospitals that have shared 
residency rotational relationships may elect to apply their respective 
IME resident caps on an aggregate basis via a Medicare GME affiliation 
agreement. We explained that our intent was not to affect affiliation 
agreements and rotational arrangements for hospitals that have 
residents that train in more than one hospital. We did not implement a 
provision concerning affiliation agreements specifically pertaining to 
the FTE caps used in the teaching adjustment under the IPF PPS.
    We also stated that we believe these policies fairly balance our 
responsibilities under the statute to assure appropriate enforcement of 
the BBA and the overall limits on payment adjustments for teaching 
hospitals with the greater precision that can be achieved by adjusting 
payments for teaching IPFs. We also stated that we believe that we have 
designed a cap that balances the need for limits with the unique 
conditions of teaching programs in freestanding psychiatric hospitals 
and in distinct part psychiatric units. We noted in our RY 2005 IPF PPS 
final rule establishing the teaching adjustment, however, that we would 
monitor the impact of these policies closely and consider changes in 
the future when appropriate (69 FR 66954 through 66957).
    In summary, the CAA, 2023 provides for the distribution of at least 
100 psychiatry or psychiatry subspecialty resident FTEs and provides 
for corresponding increases to IME payments under the IPPS but makes no 
provisions pertaining to the indirect operating costs for IPFs with 
teaching programs. For FY 2026, we proposed to recognize resident FTE 
cap increases that are awarded under section 4122 of the CAA, 2023, 
either to an IPF hospital or to an IPPS hospital for resident FTEs that 
are allocated to the IPF subunit paid under the IPF PPS. Specifically, 
we proposed that such resident FTE cap increases would align with our 
current IPF PPS teaching regulation at Sec.  412.424(d)(1)(iii)(D), 
which allows for increases to IPF resident FTE caps for a new approved 
graduate medical education program. As we previously noted, we 
established the teaching cap policy under the IPF PPS to maintain 
alignment with the requirements of the BBA that applied to IME payments 
under the IPPS, and we have noted that Sec.  412.424(d)(1)(iii)(D) is 
intended to achieve the same purpose. We stated that we believe this 
proposal would be consistent with our current regulation and our 
longstanding policy of maintaining IPF PPS teaching cap policies that 
align with IME cap policies under the IPPS. We further stated that we 
believe this proposal would continue to appropriately limit the 
incentives for IPFs to add FTE residents for the purpose of increasing 
their teaching adjustment. We solicited comments on the proposed update 
to the IPF PPS teaching policy.
    The following is a summary of the comments we received and our 
responses.
    Comment: Commenters broadly supported our proposal to recognize 
resident FTE cap increases awarded under section 4122 of the CAA, 2023, 
either to an IPF hospital or to an IPPS hospital for resident FTEs that 
are allocated to the IPF subunit paid under the IPF PPS. Commenters 
stated that this proposal would support the development of the IPF 
clinical workforce and would increase IPFs' capacity to meet patient 
needs. Commenters expressed that this proposal is especially important 
due to the shortage of psychiatrists nationwide.
    Response: We appreciate the support of commenters. We agree with 
commenters about the importance of supporting the clinical workforce 
for IPF hospitals and units. We agree that IPF patients have unique 
needs, and we believe this proposed policy would help IPFs to better 
meet those needs.
    Comment: Several commenters requested that CMS make changes to the 
Medicare cost report to allow IPFs to increase their resident caps. A 
commenter requested that CMS work with the Medicare Administrative 
Contractors to ensure that adjusted FTEs align with the program's slots 
awarded under section 4122. A commenter further noted that hospitals 
are instructed to reduce their IME applications for section 4122 slots 
for any portion of an FTE that is working in an IPF hospital or unit.
    Response: We thank commenters for their careful consideration of 
the proposal. We will issue revised instructions and guidance to the 
Medicare Administrative Contractors in the near future. We intend to 
make updates to Worksheet E-3, Part II of the Medicare Hospital Cost 
Report (CMS-2552-10, OMB No. 0938-0050) to enable IPFs to document the 
additional FTEs awarded under section 4122 of the CAA, 2023, that are 
allocated to an IPF hospital or IPF unit that is paid under the IPF 
PPS. We are clarifying that we will not include FTE increases that are 
awarded under section 4122 of the CAA, 2023, in an IPF's teaching cap 
if those FTE increases are included in any IME cap increases for the 
same hospital.
    Comment: Several commenters suggested that we adopt the same policy 
with respect to FTE cap slots awarded under section 126 of the CAA, 
2021. A commenter stated that in the first three rounds of section 126 
awards, CMS distributed 139.72 DGME slots and 90.78 IME slots to 
teaching hospitals that applied for funding to expand psychiatry and 
psychiatric subspecialty programs, even though the statute did not 
specify that the slots must be awarded for psychiatry residencies.
    Response: We appreciate the commenters' suggestion, but we note 
that we did not propose to recognize slots awarded under section 126 of 
the CAA, 2021. As commenters pointed out, section 4122 of the CAA, 
2023, is uniquely focused on psychiatry and psychiatric subspecialty 
residency slots. We are not finalizing any change to the FTE teaching 
adjustment policy with regard to section 126 of the CAA, 2021, but we 
will take these comments into consideration to potentially inform 
future rulemaking.
    Comment: Some commenters suggested that CMS should reconsider its 
cap policy for the IPF teaching adjustment, noting that CMS has broad 
authority to determine the application of caps to the IPF PPS teaching 
adjustment.
    Response: As we previously noted, we established the teaching cap 
policy under the IPF PPS to maintain alignment with the requirements of 
the BBA that applied to IME payments under the IPPS. We believe that 
the current policy fairly balances our responsibilities under the 
statute to assure appropriate enforcement of the BBA and the overall 
limits on payment adjustments for teaching hospitals with the greater 
precision that can be achieved by adjusting payments for teaching IPFs. 
We will continue to

[[Page 37651]]

monitor the impact of these policies closely and may consider changes 
in the future if appropriate.
    Final Decision: After consideration of the comments, we are 
finalizing our proposal to recognize resident FTE cap increases awarded 
under section 4122 of the CAA, 2023, either to an IPF hospital or to an 
IPPS hospital for resident FTEs that are allocated to the IPF subunit 
paid under the IPF PPS.
7. Cost of Living Adjustment for IPFs Located in Alaska and Hawaii
    The IPF PPS includes a payment adjustment for IPFs located in 
Alaska and Hawaii based upon the area in which the IPF is located. As 
we explained in the RY 2005 IPF PPS final rule, the FY 2002 data 
demonstrated that IPFs in Alaska and Hawaii had per diem costs that 
were disproportionately higher than other IPFs. As a result of this 
analysis, we provided a COLA in the RY 2005 IPF PPS final rule. We 
refer readers to the FY 2024 IPF PPS final rule for a complete 
discussion of the currently applicable COLA factors (88 FR 51088 and 
51089).
    In the FY 2013 IPPS/LTCH final rule (77 FR 53700 and 53701), we 
established a new methodology to update the COLA factors for Alaska and 
Hawaii and adopted this methodology for the IPF PPS in the FY 2015 IPF 
PPS final rule (79 FR 45958 through 45960). We also specified that the 
COLA updates will be determined every 4 years, in alignment with the 
IPPS market basket labor-related share update (79 FR 45958 through 
45960). Because the labor-related share of the IPPS market basket was 
updated for FY 2022, the COLA factors were updated in FY 2022 IPPS/LTCH 
rulemaking (86 FR 45547) reflecting CPI data through 2020. As such, we 
also finalized an update to the IPF PPS COLA factors in the FY 2022 IPF 
PPS final rule to reflect the updated COLA factors finalized in the FY 
2022 IPPS/LTCH rulemaking effective for FY 2022 through FY 2025 (86 FR 
42621 and 42622).
    Generally, under our existing methodology, we update the 2009 COLA 
factors published by the U.S. Office of Personnel Management (OPM) by a 
comparison of the growth in the Consumer Price Indices (CPIs) for the 
areas of Urban Alaska and Urban Hawaii, relative to the growth in the 
CPI for the average U.S. city as published by the Bureau of Labor 
Statistics (BLS). Using the respective CPI commodities index and CPI 
services index and using the approximate commodities/services shares 
obtained from the IPPS market basket, we create reweighted CPIs for 
each of the respective areas to reflect the underlying composition of 
the IPPS market basket nonlabor-related share. Lastly, we apply a 25 
percent cap, which was incorporated into our methodology to reflect the 
statutory cap used to calculate OPM's COLA factors. For a complete 
discussion, we refer readers to the FY 2015 IPF PPS final rule (79 FR 
45958 through 45960) as well as the FY 2022 IPF PPS final rule (86 FR 
42621 and 42622).
    Table 3 lists the COLA factors for IPFs located in Alaska and 
Hawaii as calculated under our current methodology, using updated CPI 
data through 2024 and the approximate 60 percent commodities/40 percent 
services shares obtained from the 2023-based IPPS market basket.

              Table 3--IPF PPS Cost-of-Living Adjustment Factors: IPFs Located in Alaska and Hawaii
----------------------------------------------------------------------------------------------------------------
                                                                      FY 2022      Updated COLA
                                                                    through FY     factors under
                              Area                                   2025 COLA        current       Difference
                                                                      factors       methodology
----------------------------------------------------------------------------------------------------------------
Alaska:
    City of Anchorage and 80-kilometer (50-mile) radius by road.            1.22            1.18           -0.04
    City of Fairbanks and 80-kilometer (50-mile) radius by road.            1.22            1.18           -0.04
    City of Juneau and 80-kilometer (50-mile) radius by road....            1.22            1.18           -0.04
    Rest of Alaska..............................................            1.24            1.20           -0.04
Hawaii:
    City and County of Honolulu.................................            1.25            1.25               0
    County of Hawaii............................................            1.22            1.21           -0.01
    County of Kauai.............................................            1.25            1.25               0
    County of Maui and County of Kalawao........................            1.25            1.25               0
----------------------------------------------------------------------------------------------------------------

    In the FY 2026 IPF PPS proposed rule, we stated that we believe it 
is appropriate to have a consistent policy approach with that of other 
hospitals in Alaska and Hawaii. We explained that we believe it would 
be appropriate to maintain the current COLA factors to allow CMS to 
consider whether any other data sources or methodology changes may 
improve the adjustment we make to hospital payments that accounts for 
the unique circumstances of hospitals located in Alaska and Hawaii. 
Therefore, we proposed to continue to use the FY 2025 COLA factors to 
adjust the non-labor-related portion of the standardized amount for 
IPFs located in Alaska and Hawaii for FY 2026.
    Comment: A commenter suggested reevaluating the COLA factors for 
IPFs located in Alaska and Hawaii annually due to the rise in cost of 
living and economic instability. The commenter also suggested the 
formation of a committee to inform future rate adjustments.
    Response: We appreciate the commenter's suggestions; however, we 
did not propose the specific policies suggested by the commenter. As 
discussed earlier in this section, we believe it is appropriate to have 
a consistent policy approach with that of other hospitals in Alaska and 
Hawaii. At this time, we continue to believe our current methodology 
for calculating the COLA factors for IPFs located in Alaska and Hawaii 
is appropriate.
    Final Decision: After consideration of the public comments 
received, we are maintaining the current (FY 2025) IPF PPS COLA factors 
as proposed, for FY 2026. For a complete discussion of the final FY 
2026 COLA factors, including a summary of comments received under the 
IPPS, we refer readers to the FY 2026 IPPS/LTCH final rule, published 
elsewhere in the Federal Register.
    Table 4 lists the final FY 2026 COLA factors. The final IPF PPS 
COLA factors for FY 2026 are also shown in Addendum A to this final 
rule, which is available on the CMS website at <a href="https://www.cms.gov/Medicare/Medicare-Fee-for-Service-Payment/InpatientPsychFacilPPS/tools.html">https://www.cms.gov/Medicare/Medicare-Fee-for-Service-Payment/InpatientPsychFacilPPS/tools.html</a>.

[[Page 37652]]



  Table 4--Final FY 2026 Cost of Living Adjustment (COLA) Factors: IPFs
                      Located in Alaska and Hawaii
------------------------------------------------------------------------
                         Area                              Final COLA
------------------------------------------------------------------------
Alaska:
    City of Anchorage and 80-kilometer (50-mile)                    1.22
     radius by road..................................
    City of Fairbanks and 80-kilometer (50-mile)                    1.22
     radius by road..................................
    City of Juneau and 80-kilometer (50-mile) radius                1.22
     by road.........................................
    Rest of Alaska...................................               1.24
Hawaii:
    City and County of Honolulu......................               1.25
    County of Hawaii.................................               1.22
    County of Kauai..................................               1.25
    County of Maui and County of Kalawao.............               1.25
------------------------------------------------------------------------

8. Adjustment for IPFs With a Qualifying ED
    The IPF PPS includes a facility-level adjustment for IPFs with 
qualifying EDs. As defined in Sec.  412.402, qualifying emergency 
department means an emergency department that is staffed and equipped 
to furnish a comprehensive array of emergency services and meets the 
requirements of Sec.  489.24(b) and Sec.  413.65.
    We provide an adjustment to the Federal per diem base rate to 
account for the costs associated with maintaining a full-service ED. 
The adjustment is intended to account for ED costs incurred by a 
psychiatric hospital with a qualifying ED, or an excluded psychiatric 
unit of an IPPS hospital or a critical access hospital (CAH), and the 
overhead cost of maintaining the ED. This payment applies to all IPF 
admissions (with one exception which we describe in this section), 
regardless of whether the patient was admitted through the ED. The ED 
adjustment is made on every qualifying claim except as described in 
this section of this final rule. As specified at Sec.  
412.424(d)(1)(v)(B), the ED adjustment is not made when a patient is 
discharged from an IPPS hospital or CAH and admitted to the same IPPS 
hospital's or CAH's excluded psychiatric unit. We clarified in the RY 
2005 IPF PPS final rule (69 FR 66960) that an ED adjustment is not made 
in this case because the costs associated with ED services are 
reflected in the DRG payment to the IPPS hospital or through the 
reasonable cost payment made to the CAH.
    In the FY 2025 IPF PPS final rule, we updated the adjustment factor 
from 1.31 to 1.54 for IPFs with qualifying EDs using the same 
methodology used to determine ED adjustments in prior years (89 FR 
64636). Beginning in FY 2025, IPFs with a qualifying ED receive an 
adjustment factor of 1.54 as the variable per diem adjustment for day 1 
of each patient stay. If an IPF does not have a qualifying ED, it 
receives an adjustment factor of 1.27 as the variable per diem 
adjustment for day 1 of each patient stay. For FY 2026, we proposed to 
maintain the 1.54 adjustment factor for IPFs with qualifying EDs. A 
complete discussion of the steps involved in the most recent 
calculation of the ED adjustment factor can be found in the FY 2025 IPF 
PPS final rule (89 FR 64636).
    Lastly, we note that following display of the FY 2026 IPF PPS 
proposed rule with comment period, we identified a typographical error 
in the preamble text regarding the FY 2025 adjustment factor for IPFs 
with qualifying EDs. On page 18513, in the first column, in the last 
paragraph, we made a typographical error and stated the current (FY 
2025) adjustment factor was updated ``from 1.31 to 1.53'' instead of 
``from 1.31 to 1.54''. We note that the correct FY 2025 adjustment 
factor for IPFs with qualifying EDs (that is, 1.54) is stated on page 
18506, in Table 2; and in Addendum A of the FY 2026 IPF PPS proposed 
rule with comment period.
    We did not receive any comments on the proposal to maintain the 
existing ED adjustment factor for FY 2026, and we are finalizing it as 
proposed.
9. Refinement Standardization Factor
    Section 1886(s)(5)(D)(iii) of the Act provides that revisions in 
payment implemented pursuant to section 1886(s)(5)(D)(i) for a rate 
year shall result in the same estimated amount of aggregate 
expenditures under Title XVIII of the Act for psychiatric hospitals and 
psychiatric units furnished in the RY as would have been made under 
this Title for such care in such rate year if such revisions had not 
been implemented. We interpret this to mean that revisions in payment 
adjustments implemented for FY 2026 (and for any subsequent fiscal 
year) must be budget neutral.
    Historically, we have maintained budget neutrality in the IPF PPS 
using the application of a standardization factor, which is codified in 
our regulations at Sec.  412.424(c)(5) to account for the overall 
positive effects resulting from the facility-level and patient-level 
adjustments. As discussed in section IV.B.1 of this final rule, section 
124(a)(1) of the BBRA required that we implement the IPF PPS in a 
budget neutral manner. In other words, the amount of total payments 
under the IPF PPS, including any payment adjustments, must be projected 
to be equal to the amount of total payments that would have been made 
if the IPF PPS were not implemented. Therefore, we calculated the 
standardization factor by setting the total estimated IPF PPS payments, 
taking into account all of the adjustment factors under the IPF PPS, to 
be equal to the total estimated payments that would have been made 
using TEFRA methodology had the IPF PPS not been implemented. A step-
by-step description of the methodology used to estimate payments under 
the TEFRA payment system appears in the RY 2005 IPF PPS final rule (69 
FR 66926).
    We believe the budget neutrality requirement of section 
1886(s)(5)(D)(iii) of the Act is consistent with our longstanding 
methodology for maintaining budget neutrality under the IPF PPS 
pursuant to section 124(a)(1) of the BBRA. We note that for the FY 2025 
IPF PPS rule (89 FR 64640 and 64641), we applied a refinement 
standardization factor to the FY 2024 IPF Federal per diem base rate 
and ECT per treatment amount to maintain budget neutrality for the 
change in the patient-level adjustment factors, ED adjustment, and ECT 
per treatment amount finalized in the FY 2025 IPF PPS rule.
    Therefore, for FY 2026, we proposed to apply a refinement 
standardization factor in accordance with our existing policy at Sec.  
412.424(c)(5). Under this policy, we would update IPF PPS adjustment 
factors for teaching status and for IPFs located in rural areas, as 
finalized in this FY 2026 IPF PPS final rule, in such a way that total 
estimated payments to IPFs for FY 2026 are the same with or without the 
changes (that is, in a budget neutral manner) by

[[Page 37653]]

applying a refinement standardization factor to the IPF PPS rates. We 
proposed to use the following steps to ensure that the rates reflect 
the final FY 2026 update to the facility-level adjustment factors (as 
previously discussed in sections IVII.D.5 and IV.D.6. of this final 
rule and summarized in Addendum A) in a budget neutral manner:
    Step 1: Simulate estimated IPF PPS payments using the FY 2025 IPF 
facility-level adjustment factor values (available on the CMS website).
    Step 2: Simulate estimated IPF PPS payments using the final FY 2026 
IPF facility-level adjustment factor values (see Addendum A of this 
final rule, which is available on the CMS website).
    Step 3: Divide the amount calculated in step 1 by the amount 
calculated in step 2. The resulting quotient is the final FY 2026 
refinement standardization factor of 0.9927.
    Step 4: Apply the FY 2026 refinement standardization factor from 
step 3 to the FY 2025 IPF PPS Federal per diem base rate and ECT per 
treatment amount, after the application of the wage index budget 
neutrality factor and the IPF market basket increase reduced by the 
productivity adjustment described in section IV.A. of this final rule 
to determine the final FY 2026 IPF PPS Federal per diem base rate and 
FY 2026 ECT payment amount per treatment.

E. Other Payment Adjustments and Policies

1. Outlier Payment Overview
    The IPF PPS includes an outlier adjustment to promote access to IPF 
care for those patients who require expensive care and to limit the 
financial risk of IPFs treating unusually costly patients. In the RY 
2005 IPF PPS final rule, we implemented regulations at Sec.  
412.424(d)(3)(i) to provide a per case payment for IPF stays that are 
extraordinarily costly. Providing additional payments to IPFs for 
extremely costly cases strongly improves the accuracy of the IPF PPS in 
determining resource costs at the patient- and facility-level. These 
additional payments reduce the financial losses that would otherwise be 
incurred in treating patients who require costlier care; therefore, 
reduce the incentives for IPFs to under-serve these patients. We make 
outlier payments for discharges where an IPF's estimated total cost for 
a case exceeds a fixed dollar loss threshold amount (multiplied by the 
IPF's facility-level adjustments) plus the Federal per diem payment 
amount for the case.
    In instances when the case qualifies for an outlier payment, we pay 
80 percent of the difference between the estimated cost for the case 
and the adjusted threshold amount for days 1 through 9 of the stay 
(consistent with the median LOS for IPFs in FY 2002), and 60 percent of 
the difference for day 10 and thereafter. The adjusted threshold amount 
is equal to the outlier threshold amount adjusted for wage area, 
teaching status, rural area, and the COLA factor (if applicable), plus 
the amount of the Medicare IPF payment for the case. We established the 
80 percent and 60 percent loss sharing ratios because we were concerned 
that a single ratio established at 80 percent (like other Medicare 
PPSs) might provide an incentive under the IPF per diem payment system 
to increase LOS to receive additional payments.
    After establishing the loss sharing ratios, we determined the 
current fixed dollar loss threshold amount through payment simulations 
designed to compute a dollar loss beyond which payments are estimated 
to meet the 2 percent outlier spending target. Each year when we update 
the IPF PPS, we simulate payments using the latest available data to 
compute the fixed dollar loss threshold so that outlier payments 
represent 2 percent of total estimated IPF PPS payments.
2. Update to the Outlier Fixed Dollar Loss Threshold Amount
    In accordance with the update methodology described in Sec.  
412.428(d), we proposed to update the fixed dollar loss threshold 
amount used under the IPF PPS outlier policy. Based on the regression 
analysis and payment simulations used to develop the IPF PPS, we 
established a 2 percent outlier policy, which strikes an appropriate 
balance between protecting IPFs from extraordinarily costly cases while 
ensuring the adequacy of the Federal per diem base rate for all other 
cases that are not outlier cases. We proposed to maintain the 
established 2 percent outlier policy for FY 2026.
    Our longstanding methodology for updating the outlier fixed dollar 
loss threshold involves using the best available data, which is 
typically the most recent available data. We note that for FY 2022 and 
FY 2023 only, we made certain methodological changes to our modeling of 
outlier payments, and we discussed the specific circumstances that led 
to those changes for those years (86 FR 42623 and 42624; 87 FR 46862 
through 46864). We direct readers to the FY 2022 and FY 2023 IPF PPS 
proposed and final rules for a more complete discussion.
    We proposed to update the IPF outlier threshold amount for FY 2026 
using FY 2024 claims data and the same methodology that we have used to 
set the initial outlier threshold amount each year beginning with the 
RY 2007 IPF PPS final rule (71 FR 27072 and 27073). For this FY 2026 
IPF PPS rulemaking, consistent with our longstanding practice, based on 
an analysis of the latest available data (the December 2024 update of 
FY 2024 IPF claims) and rate increases, we believe it is necessary to 
update the fixed dollar loss threshold amount to maintain an outlier 
percentage that equals 2 percent of total estimated IPF PPS payments. 
Based on an analysis of these updated data, we estimated that IPF 
outlier payments as a percentage of total estimated payments would be 
slightly higher than 2.0 percent in FY 2025. Therefore, we proposed to 
update the outlier threshold amount to $39,360 to maintain estimated 
outlier payments at 2 percent of total estimated aggregate IPF payments 
for FY 2026. The proposed update would be an increase from the FY 2025 
threshold of $38,110. Lastly, we proposed that if more recent data 
become available for the FY 2026 IPF PPS final rule, we would consider 
using such data to determine the final outlier fixed dollar loss 
threshold amount for FY 2026.
    We solicited comments on the proposed update to the outlier fixed 
dollar loss threshold amount. The following is a summary of the 
comments we received and our responses.
    Comment: A commenter expressed concern about CMS's proposal to 
raise the IPF outlier fixed-loss threshold to $39,360 for FY 2026. The 
commenter stated the proposed threshold is too high and will reduce the 
number of cases qualifying for outlier payment relief. The commenter 
expressed concern about the impact on facilities that treat the most 
medically complex or violent psychiatric patients, as this creates 
significant financial risk for these specialized providers.
    Response: The proposed increase in the IPF outlier fixed-loss 
threshold from $38,110 to $39,360 is intended to maintain budget 
neutrality by ensuring outlier payments remain at approximately 2.0 
percent of total IPF payments as required by statute, reflect cost 
inflation to account for general cost increases in healthcare delivery, 
and preserve program integrity by maintaining the outlier payment 
system's role in protecting facilities from truly extraordinary costs. 
We carefully calibrate the threshold annually using the most recent 
available cost and claims data, with the 2.0 percent target for outlier 
payments representing a balance between

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providing adequate protection for high-cost cases while maintaining 
overall payment system stability, supported by historical data analysis 
to achieve the statutory target. Our analysis indicates that the 
proposed threshold maintains the appropriate balance between outlier 
payment availability and budget neutrality, and while the proportion of 
cases receiving outlier payments may decrease, the total outlier 
payment pool remains consistent with statutory requirements, with the 
threshold adjustment reflecting actual cost trends in IPF services.
    Comment: Two commenters noted concern that the increase in the 
outlier fixed loss threshold exceeds the proposed 2.4 percent update to 
IPF rates, creating a disparity that could negatively impact 
facilities. The commenters specifically requested that CMS consider 
adopting an alternative methodology used in FY 2022 and FY 2023, which 
involved removing IPFs with extremely high or low costs per day (3+ 
standard deviations from the mean) to create a more homogeneous 
dataset, as this approach previously helped mitigate increases in the 
fixed loss threshold and could serve as an effective means of reducing 
the proposed threshold increase for FY 2026.
    Response: While the commenters correctly reference our use of 
statistical trimming methodology in prior years, it is important to 
clarify that the approach used in FY 2023 (87 FR 46862)--which involved 
excluding providers whose change in estimated average cost per day fell 
outside 3 standard deviations from the mean--was implemented as a 
targeted response to extraordinary data distortions caused by the 
COVID-19 PHE, rather than as a routine alternative methodolog

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Indexed from Federal Register on August 5, 2025.

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