Key Medicare Enrollment Dates to Mark on Your Calendar

Timing is everything when navigating Medicare updates. Missing critical windows can lock you into unfavorable coverage for an entire calendar year.

• September 2026: Insurers release plan landscape data and mail your Annual Notice of Change (ANOC) letter detailing cost adjustments.
• October 15 – December 7, 2026: The Medicare Annual Open Enrollment Period opens for comparing, selecting, or changing your Part D and Medicare Advantage plans.
• January 1, 2027: All new benefit structures, negotiated drug caps, and updated premiums take effect.
• January 1 – March 31, 2027: Medicare Advantage Open Enrollment allows existing Medicare Advantage enrollees to switch plans or return to Original Medicare.

Be sure to review your ANOC letter thoroughly as soon as it arrives. Insurers use this document to notify you of dropped medications or tier changes.