January 1 through March 31, 2027

Medicare Advantage Open Enrollment Resource Center

Already in a Medicare Advantage plan? Check your options and review your coverage before deciding whether to make a change.

See Who Can Make a Change Download the one-page Quick Reference

2027 Medicare Advantage Open Enrollment at a Glance

Who can use it: People already enrolled in Medicare Advantage.
What you can change: Make one change. Switch Advantage plans or return to Original Medicare, with the option to join a separate Part D plan.
When coverage starts: Generally the first day of the month after the plan receives your request.

If you joined Medicare Advantage during your Initial Enrollment Period, you may also have a change window during your first three months with Parts A and B. Check Medicare’s enrollment rules or read our OEP FAQ.

Choose Your Next Step

Review My Current Plan

Check whether your plan still works for your doctors, prescriptions, and budget.

Switch Medicare Advantage Plans

Compare available plans and confirm the new coverage start date before switching.

Return to Original Medicare

Check Part D, providers, and Medigap eligibility before leaving your plan.

What to Check Before You Change Plans

Doctors and hospitals. Confirm the exact plan name and each provider’s office location with the plan and the provider.
Prescriptions. Look up each medication, dosage, and quantity. Check tiers and any coverage requirements.
Pharmacy. Check whether your pharmacy is in network and whether the plan treats it as preferred.
Total costs. Compare premiums, deductibles, copays, and the medical out-of-pocket maximum.
Effective date. Confirm when current coverage ends and when any new coverage begins. Save the confirmation.

For example, if you see a specialist in Brandon, confirm that the specialist participates at the office you visit. Start with the Brandon doctor and hospital network checklist and the Brandon prescription cost comparison.

What to Confirm Before Returning to Original Medicare

Check that your providers accept Original Medicare. If you need drug coverage, compare stand-alone Part D plans and confirm the start date. If you want Medigap, verify your eligibility and any applicable buying protections before leaving your current plan.

Medigap buying protections depend on your circumstances. Review Medicare’s Medigap rules, our Florida guaranteed issue FAQ, and the steps for returning to Original Medicare.

How OEP Differs From Fall Annual Enrollment

Medicare Advantage OEP: January 1 to March 31. Current Medicare Advantage members can make one eligible change. It generally starts the following month.
Fall Annual Enrollment: October 15 to December 7. People with Medicare can make a wider range of Advantage and drug plan changes for January 1. See the fall enrollment guide.

Already on Original Medicare? The annual Medicare Advantage OEP is for Advantage members. Check the Medicare enrollment timeline for other windows.

Download the 2027 OEP Quick Reference

Print the eligibility summary and five-point checklist, or keep the PDF handy while comparing plans.

Download the Quick Reference PDF

Reviewed November 13, 2026. For help confirming your options, visit Medicare Plan Finder or call 1-800-MEDICARE.