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Exception: To facilitate the offering of employer or union sponsored MSA plans, individuals may request enrollment into an employer or union sponsored MSA plan using the Employer Group Health Plan Special Election Period (EGHP SEP).

Individuals may disenroll from Medicare MSA plans only during the AEP or an SEP. The effective date of disenrollment during an SEP depends on the type of SEP. Additionally, MSA enrollees may not use the MA OEP to disenroll from the MSA. An individual who elects an MA MSA plan during the AEP and has never before elected an MA MSA plan may revoke that election, no later than December 15 of that same year.