5 C.F.R. § 890.1113

(a) OPM has determined that the administrative charge as provided under 5 U.S.C. 8905a(d)(1)(A)(ii) is 2 percent of the enrollment charge described in § 890.503(a).

(b) It is OPM's responsibility to establish procedures for receiving the administrative payment into the Employees Health Benefits Fund and for making this amount available to the employing office.