Jessica Kauffman | Medicare Golden Angel on Instagram: "Key Medicare Enrollment Periods Initial Enrollment Period (IEP): Your first chance to sign up when turning 65. It’s a 7-month window: the 3 months before your 65th birthday month, your birthday month, and the 3 months after. Annual Enrollment Period (AEP): October 15 – December 7. Use this time to join, switch, or drop Medicare Advantage (Part C) or Part D (prescription drug) plans. Medicare Advantage Open Enrollment Period (MA OEP): Januar