Withholdings
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
The appropriate retirement office shall withhold from the annuity or compensation of each of its retired employees who has elected to subscribe to the uniform plan so much as is necessary to pay his share of the cost of his subscription. The withholdings shall be forwarded, in accordance with OPM instructions, to the Retired Employees Health Benefits Fund.
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.