CFR›Title 5›Chapter I›Part 839›Subpart D›Subject Group Erroneous CSRS or CSRS Offset ContainsSection § 839.401CorpusDaily eCFRDisplayed edition2026-10-22Last updated2026-10-22 Sections § 839.401 § 839.401 What can I elect if I was put in CSRS or CSRS Offset by mistake?