Your Initial Enrollment Period (IEP) is a 7-month window: it starts 3 months before the month you turn 65, includes your birthday month, and end 3 months after.
Other key enrollment periods include:
Annual Enrollment Period (AEP): October 15- December 7 each year. You can join, switch, or drop Medicare Advantage or Part D plans. Changes take effect January 1.
General Enrollment Period (GEP): January 1-March 31 if you missed your IEP. Coverage starts the month after you enroll.
Special Enrollment Period (SEP): Triggered by specific life events like moving, losing employer coverage, or qualifying for Medicaid.