SEP for International Volunteers
Individuals who do not enroll in Part B or premium Part A when first eligible because they were performing volunteer service outside of the United States for at least 12 months on behalf of a tax-exempt organization and had health insurance that provided coverage for the duration of the volunteer service may enroll using this SEP.
The SEP is a 6-month period that begins the earlier of the first day of the month following the month for which the:
individual was no longer serving as a volunteer outside of the United States;
organization no longer has tax-exempt status; or
individual no longer has health insurance that provides coverage outside of the United States.