Medicare Open Enrollment Deadline
Medicare open enrollment ends on December 7 every year, and the coverage changes you make during this window take effect on January 1 of the following year. The annual enrollment period, also called AEP, is the main time when people on Medicare can switch between Original Medicare and Medicare Advantage, change prescription drug plans, or drop a plan altogether.
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Why the December 7 Date Matters
After December 7, you generally cannot make new coverage choices for the coming year unless you qualify for a special enrollment period. This fixed deadline is set by federal law and applies to all Medicare Advantage and Part D plans nationwide. Missing the window means you may have to wait until the next open enrollment or a qualifying life event to make changes.
Key Dates in the Medicare Calendar
| Period | Dates | What You Can Do |
|---|---|---|
| General Enrollment | January 1 – March 31 | Enroll in Part A or Part B if you missed your initial window |
| Annual Open Enrollment | October 15 – December 7 | Switch plans, join or leave a Medicare Advantage or Part D plan |
| Medicare Advantage Open Enrollment | January 1 – March 31 | Switch between Medicare Advantage plans or go back to Original Medicare once |
Special Enrollment Exceptions
Certain situations allow you to change your Medicare coverage outside the standard open enrollment period. Moving to a new area, losing employer coverage, or qualifying for Extra Help with Part D costs can trigger a special enrollment period. If you miss the December 7 deadline but experience a qualifying event, contact Medicare or your plan directly to check your options.
What Happens If You Do Nothing
If you do not make any changes during open enrollment, your current Medicare Advantage or Part D plan will typically renew automatically for the next year. However, plan costs, formularies, and provider networks can change, so reviewing your coverage each fall is important even if you plan to keep what you have.