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Medicare open enrollment 2026 dates: the quick answer Medicare Open Enrollment for 2027 coverage begins October 15, 2026 and ends December 7, 2026 . Changes you make in this window take effect January 1, 2027. Medicare has more than one enrollment window, and each one allows different changes. This guide starts with the fall window, then covers the January-March windows and Special Enrollment Periods. One detail matters for the deadline: your health or drug plan must get your enrollment request by December 7. Do not wait for the last day. What you can change during fall Open Enrollment There are three kinds of change. Switch your type of coverage. You can move from Original Medicare to a Medicare Advantage Plan, or from a Medicare Advantage Plan back to Original Medicare. Change your Medicare Advantage Plan. You can join, drop, or switch to another Medicare Advantage Plan, with or without drug coverage. Change your Part D drug plan. If you have Original Medicare, you can j...