The U.S. Office of Personnel Management (OPM) is issuing an interim final rule to administer the Postal Service Health Benefits (PSHB) Program within the Federal Employees Health Benefits Program pursuant to the Postal Service Reform Act of 2022 (PSRA). Under 5 U.S.C. Section 8903c, OPM must establish a PSHB Program for Postal Service employees, Postal Service annuitants, and their eligible family members, and not later than one year after the date of enactment, the OPM Director must issue regulations to carry out section 8903c. Subject to limited exceptions, Postal Service annuitants who retire and become Medicare-eligible after December 31, 2024, and their Medicare-eligible family members will be required to enroll in Medicare Part B as a condition of eligibility to enroll in the PSHB Program.