Medicare enrollment deadline in Missouri
Federal Medicare enrollment windows apply to Missouri residents. State-specific Medigap rules can change your switching rights.
Enrollment windows in Missouri
| Window | Dates | Who it's for |
|---|---|---|
| Initial Enrollment (IEP) | 7-month window around your 65th birthday month | First-time enrollees |
| General Enrollment (GEP) | January 1 – March 31 | People who missed their IEP |
| Annual Enrollment (AEP) | October 15 – December 7 | Anyone changing Part C or D plans |
| MA Open Enrollment (OEP) | January 1 – March 31 | Medicare Advantage members |
Missouri Medigap notes
Missouri lets you switch Medigap plans each year during a 60-day window around your policy anniversary under the state anniversary rule.
Outside of guaranteed issue periods, most Medigap insurers can use medical underwriting. Check whether Missouri offers a birthday rule or anniversary window before assuming you can switch plans freely.
What to do next in Missouri
- Confirm your exact 7-month Initial Enrollment Period using your date of birth.
- Compare Medicare Advantage and Medigap with the side-by-side comparison.
- Estimate any Part D late enrollment penalty if you delayed drug coverage.
Frequently asked questions
- When is the Medicare Initial Enrollment Period in Missouri?
- The Initial Enrollment Period is the same in every state, including Missouri. It is a seven-month window that starts three months before the month you turn 65 and ends three months after.
- What is the Medicare Annual Enrollment Period in Missouri?
- In Missouri, as in every state, the Annual Enrollment Period runs October 15 through December 7. You can change Medicare Advantage or Part D plans, with new coverage starting January 1.
- Does Missouri have special Medigap rules?
- Federal Medicare rules apply everywhere, but several states layer extra Medigap protections on top. See the state-specific note on this page for Missouri.
- Where can Missouri residents get free Medicare help?
- Every state has a State Health Insurance Assistance Program (SHIP) that offers free, unbiased Medicare counseling. Missouri residents can contact their local SHIP office for one-on-one help.
Other states
Get your exact dates for Missouri
Enter your date of birth and we'll calculate the precise start and end of every enrollment window that applies to you.
Educational resource. Not legal, tax, or insurance advice. Always confirm specifics with Medicare.gov or your State Health Insurance Assistance Program.