5 C.F.R. § 839.241
Am I eligible to make an election under the FERCCA if I had a qualifying retirement coverage error and none of the conditions mentioned in § 839.212 through § 839.232 apply to me?
If you were in CSRS or CSRS Offset and should have been in FERS or Social Security-Only, or if you were in FERS and should have been in CSRS, CSRS Offset, or Social Security-Only, then you have an election opportunity. This is summarized in the following chart:
| You are or were in: | And you belong in: |
|---|---|
| CSRS or CSRS Offset | FERS. |
| CSRS or CSRS Offset | Social Security-Only. |
| FERS | Social Security-Only. |
| FERS | CSRS. |
| FERS | CSRS Offset. |