Summary of Enrollment Periods for Medicare Parts A, B, C & D

 Part APart BPart C (Medicare Advantage plans)Part D (Prescription Drug plans)
IEP – Initial Enrollment PeriodStarts 3 months before and ends 3 months after month of eligibility — total of 7 monthsStarts 3 months before and ends 3 months after month of eligibility — total of 7 monthsICEP can be 3 to 7 months depending on enrollment in Part BStarts 3 months before and ends 3 months after month of eligibility — total of 7 months
GEP – General Enrollment PeriodJan 1 to Mar 31Jan 1 to Mar 31 Apr 1 – Jun 30 Apr 1 – Jun 30
AEP – Annual Election Period  Oct 15 to Dec 7Oct 15 to Dec 7
SEP – Special 
Enrollment Period & Special Election Periods
 Yes – Special Enrollment PeriodYes – Special Election PeriodsYes – Special Election Periods
MA OEP – Medicare Advantage Open Enrollment Period  Jan 1 to Mar 31