48 C.F.R. § 2101.102
(b) The LIFAR does not replace or incorporate regulations found at 5 CFR part 870, which provide the substantive policy guidance for administration of the FEGLI Program under 5 U.S.C. chapter 87. The following is the order of precedence in interpreting a contract provision under the FEGLI Program:
[58 FR 40372, July 28, 1993, as amended at 70 FR 41149, July 18, 2005]