42 CFR § 408.104
Reinstatement procedures
June 11, 2020
(a) Request for payment. If the conditions of §408.102(a) (1) and (2) are met, SSA sends written notice requesting the enrollee to pay, within 30 days, all premiums due through the month in which the enrollee appealed the termination.
(b) Reinstatement of coverage. If SSA receives the requested payment within 30 days, it sets aside the termination and reinstates the enrollee's coverage without interruption.