5 CFR §837.101

1. (a)This part prescribes rules governing—
   1. (1)Reemployment of an annuitant by the Federal Government;
   2. (2)Reemployment of an annuitant by the government of the District of Columbia when the annuitant—
      1. (i)Had been employed subject to CSRS by the District of Columbia prior to October 1, 1987;
      2. (ii)Is an employee of the government of the District of Columbia not excluded from CSRS under § 831.201(g) or § 831.201(i); or
      3. (iii)Is an employee of the District of Columbia who is deemed to be a Federal employee for FERS purposes under § 842.107 or § 842.108 of this chapter; and
   3. (3)The payment of retirement and death benefits based on reemployment covered by this part.
2. (b)This part is not applicable to reemployment, in the Executive Branch, under 5 U.S.C. 8344(i) or 8468(f) (see part 553 of this chapter), relating to reemployment of retirees to meet exceptional employment needs, or to employment under 5 U.S.C. 8344 (j) or (k) or 5 U.S.C. 8468 (g) or (h) in the Judicial or Legislative Branches.