Medicare enrollment periods in Missouri
Medicare's enrollment windows are set by federal rules, so they are the same in Missouri as in every other state. The 2026 Annual Enrollment Period: October 15 – December 7, 2026. Changes made during the Annual Enrollment Period take effect January 1, 2027.
IEP
Initial Enrollment Period
The Initial Enrollment Period is your personal seven-month window around your 65th birthday. It opens three months before the month you turn 65 and closes three months after. This is when most people enroll in Medicare for the first time.
AEP
Annual Enrollment Period
The Annual Enrollment Period runs from October 15 through December 7 each year. During AEP, people with Medicare can enroll in, change, or drop a Medicare Advantage plan or a Part D plan. Changes made during AEP take effect on January 1 of the following year.
MA OEP
Medicare Advantage Open Enrollment Period
The Medicare Advantage Open Enrollment Period runs from January 1 through March 31. During this window, people already enrolled in Medicare Advantage can make one change: to a different Medicare Advantage plan, or back to Original Medicare, with or without a Part D plan. The change takes effect the first of the month after the plan gets the request.
SEP
Special Enrollment Periods
Special Enrollment Periods open when specific life events happen, such as losing employer coverage or moving to a new area. The timing depends on the event, and Medicare.gov explains the rules for each one.
Missouri SHIP, formerly CLAIM
Missouri SHIP is the state's official State Health Insurance Assistance Program. It changed its name from Missouri CLAIM in 2023 to make that clear, and it gives unbiased, confidential Medicare counseling. It is not an insurance company.
Missouri SHIP works through trained volunteer counselors and community partners throughout the state. Its phone number is 800-390-3330. If you are new to Medicare, our guide to what Medicare is explains the parts of Medicare before you call.
Missouri's Insurance Consumer Hotline
The Missouri Department of Commerce and Insurance takes insurance questions and complaints through its Insurance Consumer Hotline, 800-726-7390, and can also tell you whether an agent is licensed. For federal Medicare rules themselves, Medicare.gov and 1-800-MEDICARE are the official sources.
Where to get Medicare help in Missouri
These public programs and contacts are listed by official sources. Each one links to the page it came from.
Medicare counseling (SHIP)
Missouri SHIP is Missouri's official State Health Insurance Assistance Program. It was called Missouri CLAIM until 2023, gives unbiased and confidential Medicare counseling, and is not an insurance company. Phone: 800-390-3330.
Source: Missouri SHIP (missouriship.org)
State insurance consumer help
The Missouri Department of Commerce and Insurance welcomes insurance questions and complaints, including questions about health insurance and an agent's license status, through its Insurance Consumer Hotline at 800-726-7390.
How a licensed independent agent helps in Missouri
A licensed independent insurance agent can explain how the parts of Medicare fit together, walk through the enrollment windows that apply to your situation, and review the plans the agent offers in your area. The review is educational, and there is no obligation to enroll.
An agent is different from a state counseling program. Counselors at a State Health Insurance Assistance Program do not sell insurance. A licensed agent can help with an application, but can only discuss the plans that agent offers, which is why the plan-availability disclosure appears near the request button on this page.
Many people use both: unbiased counseling to understand the rules, and an agent to review specific options. If you are new to Medicare, start with what Medicare is and how it works, then read about the Annual Enrollment Period. For other coverage questions in Missouri, see the Missouri state guide.
Have questions? Review your options with a licensed agent.
Review your Medicare options in Missouri
Answer a few questions and a licensed agent will follow up to walk through the plans they offer in your area. Educational, no pressure, and no obligation to enroll.
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We do not offer every plan available in your area. Any information we provide is limited to those plans we do offer in your area. Please contact Medicare.gov or 1-800-MEDICARE to get information on all of your options.
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FAQ
Medicare questions from Missouri
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Related reading
Medicare education hub
How Parts A, B, C and D work, and the enrollment timeline.
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Medicare Annual Enrollment Period
What the October 15 through December 7 window allows.
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What is Medicare?
A plain-language beginner's guide.
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Medicare Special Enrollment Periods
Life events that open a window outside AEP.
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Missouri state guide
Both coverage guides for Missouri and license details.
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States we serve
Every state where Alexander James is licensed.
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