When Is Medicare Open Enrollment 2024. Open enrollment for medicare supplement spans six months, beginning on the first day of the month in which you’re both at least 65 years old and enrolled in medicare part b. 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.

When is the annual medicare open enrollment period? This is the time medicare enrollees can review and change their coverage.