Which CPIs does OPM use?
Primary source
Verbatim text below is from the Electronic Code of Federal Regulations (eCFR), a public-domain U.S. government work. Always verify the current version with the eCFR before relying on it for any legal matter.
Full Text
OPM uses the following CPIs:
(a) For the Washington, DC, area—the BLS Consumer Price Index, All Urban Consumers (CPI-U);
(b) For all COLA areas in the State of Alaska—the BLS CPI-U for Anchorage, AK;
(c) For all COLA areas in the State of Hawaii and for Guam and the CNMI—the BLS CPI-U for Honolulu, HI; and
(d) For Puerto Rico and the U.S. Virgin Islands—the Puerto Rico CPI as produced by the Puerto Rico Department of Work and Human Resources.
This is legal information, not legal advice. Laws vary by jurisdiction and change frequently. Always verify current law with official sources and consult a licensed attorney in your jurisdiction for advice on your specific situation.