Changing Medicare coverage takes more than submitting an application. Confirm the permitted enrollment period, the new coverage's acceptance and start date, and what happens to insurance you already have.
Use the right enrollment opportunity
| Opportunity | Who it serves |
|---|---|
| October 15–December 7 | Annual changes to Medicare Advantage and Part D, generally effective January 1. |
| January 1–March 31 | Specified changes for people already in Medicare Advantage. |
| Special Enrollment Period | People meeting a particular qualifying event and its deadline. |
| Medigap purchase or change | Separate rights, state protections and possible underwriting. |
Do not assume you can change any policy whenever you want. Initial Medicare enrollment and enrollment after qualifying employment-based coverage have additional rules.
Before applying
- Verify doctors, hospitals and anticipated care in the proposed plan.
- Compare premiums and medical cost sharing, not only extras.
- Ask how a change affects employer, retiree and dependent coverage.
- Confirm any right to buy Medigap before leaving Medicare Advantage.
- Check which existing coverage ends automatically and which requires separate cancellation.
After applying
Save the confirmation and a copy of the request. Respond to missing-information notices. If the status is unclear, contact the plan rather than submit duplicate applications. Verify the effective date in the acceptance notice.
Joining a replacement Medicare plan can end the old plan when the new coverage starts, depending on the coverage involved. Medigap generally requires a separate cancellation request. Ask both organizations about the exact sequence; avoid a gap created by canceling too early.
Prepare for the first visit
Have the new identification card, member-services contact and benefit documents ready. Tell providers about the change and verify referral or authorization requirements for already scheduled care. Keep earlier records for claims from prior coverage dates.
If you return to Original Medicare, review whether you need separate Part D coverage. A Medicare Advantage enrollment opportunity does not guarantee Medigap acceptance. Get unresolved questions answered before the current policy ends.
Related coverage questions
- Medicare Annual Open Enrollment: A Practical Review
- Changing Medigap: Check Your Rights Before Canceling
- How to Find and Verify a Medicare Provider