5 CFR § 870.1005 - Premiums.
(a) Government contributions and employee withholdings required under subpart D of this part are paid from the funds provided under section 599C(e) of Pub. L. 101–513 (104 Stat. 2035).
(b) If an individual isn't insured for the full pay period, premiums are paid only for the days he/she is actually insured. The daily premium is the monthly premium multiplied by 12 and divided by 365.
(c) OPM may accept the payments required by this section in advance from a State Department appropriation, if necessary to fund the 12–month period of coverage beginning the earlier of:
(1) The day after sanctions or hostilities end; or
(2) The day after the individual's hostage status ends.
(d) OPM will place any funds received under paragraph (c) of this section in an account set up for that purpose. OPM will make the deposit required under 5 U.S.C. 8714 from the account when the appropriate pay period occurs.