Updated September 30, 2026 Medicare Open Enrollment runs from October 15 through December 7, 2026. This is when people with Medicare can review their coverage and make changes that take effect January 1, 2027. On September 28, CMS released the finalized 2027 Medicare Advantage and Part D information. The national headlines are fairly reassuring. But averages don’t tell you what will happen to your plan, and for many families, the details matter more than the headline. The Nat