Medicare Open Enrollment 2024 Start Date. Open enrollment starts — first day you can enroll in, renew, or change marketplace plans. If you have medicare, open enrollment — which runs from october 15 through december 7 — is when you can make changes to your health and prescription drug plans.

If you’re already enrolled in medicare, you can make changes to your plan during open enrollment. 1 to march 31, 2024, when you can.