Missing a Medicare enrollment deadline does not always produce the same result. Start by identifying the coverage you have and the change you intended to make. The annual fall period, first-time Medicare enrollment and Medigap enrollment are separate.
Which period did you miss?
| Period | What to review next |
|---|---|
| Annual Open Enrollment, October 15–December 7 | Whether you qualify for another opportunity to change a private Medicare plan. |
| Initial Parts A and B enrollment | Social Security's general or special enrollment rules and possible penalties. |
| Medigap Open Enrollment | Guaranteed-issue protections, state rules and possible underwriting. |
If you already have Medicare Advantage
From January 1 through March 31, Medicare Advantage Open Enrollment generally allows one change to another Medicare Advantage plan or a return to Original Medicare, with an opportunity to join a separate Part D plan. The new coverage generally begins the first of the following month.
This period is not a general opportunity for someone with Original Medicare to join Medicare Advantage. It also does not automatically create a right to buy any Medigap policy without health questions.
Check for a special enrollment opportunity
A move, certain losses of coverage or other recognized circumstances may create a Special Enrollment Period. Each event has its own rules, permitted changes and deadline. Give Medicare accurate dates and keep supporting notices. Do not claim a qualifying event that did not occur.
When no applicable period is available, you may need to wait for the next permitted opportunity. If a mistake, emergency or misleading information affected enrollment, explain the circumstances to Medicare or Social Security and ask whether relief applies. Approval is not guaranteed.
Will existing coverage disappear?
Not changing a renewing plan during the fall does not ordinarily cancel enrollment. Read any nonrenewal, eligibility or unpaid-premium notice separately. Costs and benefits can change even when enrollment continues.
Prepare before you call
- Current coverage and effective dates.
- The change you wanted to make.
- Deadline and any event dates.
- Relevant notices and application confirmations.
- Upcoming care that may be affected.
Related coverage questions
- Medicare Advantage Open Enrollment: January–March Changes
- Medicare Special Enrollment: Check the Event and Deadline
- Your Medigap Open Enrollment Period