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

Part A Part B Part C (Medicare Advantage plans) Part D (Prescription Drug plans)
IEP – Initial Enrollment Period Starts 3 months before and ends 3 months after month of eligibility — total of 7 months Starts 3 months before and ends 3 months after month of eligibility — total of 7 months ICEP can be 3 to 7 months depending on enrollment in Part B Starts 3 months before and ends 3 months after month of eligibility — total of 7 months
GEP – General Enrollment Period Jan 1 to Mar 31 Jan 1 to Mar 31
AEP – Annual Election Period Oct 15 to Dec 7 Oct 15 to Dec 7
SEP – Special 
Enrollment Period & Special Election Periods
Yes – Special Enrollment Period Yes – Special Election Periods Yes – Special Election Periods
MADP – Medicare Advantage Disenrollment Period Jan 1 to Feb 14