Home/Glossary/Open Enrollment End DateGlossary · EnrollmentOpen Enrollment End DateDecember 7 is the end of the Annual Election Period each year. Changes made during AEP take effect January 1.Related TermsInitial Enrollment Period (IEP)Annual Election Period (AEP)General Enrollment PeriodSpecial Enrollment Period (SEP)Medicare Advantage Open Enrollment (MA-OEP)SHIPLate Enrollment PenaltyCOBRA← Back to glossary index