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Medicare Enrollment Periods in 2026: Don't Miss Your Window
Here is the short version: Medicare has five different enrollment windows, and which one matters to you depends on your situation. Miss the wrong one and you can end up with a penalty that follows you for life -- so it is worth getting right. Retirement Resources is a local, independent St. Louis agency, and we will help you figure out exactly which window applies to you, at no cost. Call or text the Retirement Resources team at (314) 248-6500.
The five windows, in plain English
Most of the confusion around Medicare comes down to timing. Here is each window and what it is for.
1. Initial Enrollment Period (IEP) -- your first window at 65
This is the big one. It is a 7-month window: the 3 months before your 65th-birthday month, your birthday month, and the 3 months after. This is when you sign up for the base -- Parts A and B -- and pick what fills the gaps. Enrolling on time here is what keeps you from getting a late penalty down the road.
2. General Enrollment Period (GEP) -- the catch-up window
If you miss your Initial Enrollment Period and you do not qualify for a special window, this is your fallback: January 1 through March 31 each year. It works, but this is also where late-enrollment penalties usually come into play, so we would rather help you avoid needing it.
3. Special Enrollment Period (SEP) -- when life changes
A special window opens when something specific happens: you lose employer coverage, you move, you qualify for Extra Help, and a handful of other life events. If your situation changes, tell us as soon as you know -- it is a lot easier to set things up before a deadline than after one.
4. Annual Enrollment Period (AEP) -- the fall window everyone talks about
October 15 through December 7 every year. This is when you can change your plan for the coming year -- switch Medicare Advantage plans, change your Part D drug plan, or move between paths. Changes you make take effect January 1. This is also when we reach back out to clients for a yearly review, because plans change and so do your prescriptions.
5. Open Enrollment Period (OEP) -- a second look in the new year
January 1 through March 31. If you are on a Medicare Advantage plan and the fit is not right, this window lets you make one change. It is a useful safety net if something about your plan surprises you in January.
About those late-enrollment penalties
This is the part people do not realize until it is too late. If you go without coverage when you were supposed to have it, Medicare can add a permanent amount to your premium:
- Part B penalty: generally 10% added to your premium for every full 12 months you could have had Part B but did not -- and it stays on your premium for as long as you have Part B.
- Part D penalty: a smaller amount added per month you went without creditable drug coverage after you were first eligible.
The good news: both are avoidable. Enroll on time, or keep creditable coverage and let us confirm it counts. Bottom line, a quick conversation now can save you from a penalty later.
Still working past 65? Timing is different for you.
If you or your spouse still have employer coverage, the rules on when you have to take Part B depend on the size of the employer -- and getting that timing wrong is one of the easiest ways to trigger a penalty. It is worth a short conversation before you decide, so you do not enroll too early or too late.
How we help -- and what it costs you
Nothing. Our help is free to you; agents are paid by the insurance carriers, and that does not change your premium. When you work with us, you get a local team that has helped thousands of families with Medicare since 2013. Your options are reviewed by our licensed Medicare specialists, including Katie, licensed in Missouri, Illinois, and Florida. We will figure out which window applies to you and walk through your choices in plain language -- no pressure.
Frequently asked questions
When exactly does my Initial Enrollment Period start?
It begins 3 months before the month you turn 65 and ends 3 months after -- a 7-month window centered on your birthday month. Starting early helps your coverage begin on time.
What is the difference between AEP and Open Enrollment?
AEP (October 15 to December 7) is the main fall window when anyone can change plans for the next year. The Open Enrollment Period (January 1 to March 31) is a second window specifically for people already on a Medicare Advantage plan to make one change.
I missed my Initial Enrollment Period -- what now?
Depending on your situation, you may qualify for a Special Enrollment Period; if not, the General Enrollment Period (January 1 to March 31) is your next chance. Either way, let us look at your specifics so we can minimize any penalty.
Does it cost anything to get help figuring this out?
No. Our help is free to you, and you pay the same premium whether you enroll through us or on your own.
Not sure which window applies to you? Let's figure it out -- free.
Call or text the Retirement Resources team: (314) 248-6500
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