5 C.F.R. § 839.603 Can I later change my election?
Title 5 - Administrative Personnel
Your election is irrevocable once your employer or OPM processes it. If you do not make a timely election, the resulting coverage (see §839.602) is also irrevocable.
Title 5: Administrative Personnel
PART 839—CORRECTION OF RETIREMENT COVERAGE ERRORS UNDER THE FEDERAL ERRONEOUS RETIREMENT COVERAGE CORRECTIONS ACT
Subpart F—Making an Election
General Provisions
§ 839.603 Can I later change my election?
