Medicare Annual Enrollment Deadline and Plan Changes Explained

The Medicare Annual Enrollment Period deadline is December 7th, providing an essential window for beneficiaries to review and select suitable Medicare Advantage Plans. Beneficiaries currently enrolled in Medicare Advantage Plans can make additional adjustments during the Medicare Advantage Open Enrollment Period from January 1st to March 31st by consulting with an agent. Certain Medicare Advantage Plans are being discontinued as of December 31, 2025, giving affected enrollees until February 28, 2026, to switch to another Medicare Advantage Plan or revert to original Medicare with the option to add a Medicare supplement without underwriting.