5 CFR § 890.1208 - Premiums.
(b) If the individual is not covered under this subpart for the full pay period, premiums are paid only for the days he or she is actually covered. The daily premium rate is an amount equal to the monthly premium rate multiplied by 12 and divided by 365.
(1) The day after sanctions or hostilities end; or
(2) The day after the individual's period of hostage status ends.
(d)OPM will place any funds received under paragraph (c) of this section in an account established for this purpose. OPM will make the disbursements specified under 48 CFR subpart 1632.170 from this account when the appropriate pay period occurs.