Medicare Enrollment Dates: Every 2026 Window, One Page

Q: When is Medicare open enrollment for 2026?

October 15 through December 7. Medicare open enrollment is the everyday name for the Annual Enrollment Period, and it runs the same dates every fall. Changes you make, such as switching Medicare Advantage plans, moving between Original Medicare and MA, or changing Part D drug plans, take effect January 1.

Q: What is the Medicare Advantage Open Enrollment Period?

January 1 through March 31, for people already enrolled in a Medicare Advantage plan. It allows one switch: to a different MA plan, or back to Original Medicare plus a standalone Part D plan. You cannot use it to move from Original Medicare into Medicare Advantage; that change waits for the fall Annual Enrollment Period.

Q: What is the Medicare General Enrollment Period?

January 1 through March 31, for people who missed their Initial Enrollment Period and do not qualify for a Special Enrollment Period. You can sign up for Part A and/or Part B, with coverage starting the month after you enroll. A late penalty of roughly 10% per 12 months of delay is usually added to Part B for life.

Q: Do you have to enroll in Medicare every year?

No. Original Medicare continues automatically, and Medicare Advantage and Part D plans auto-renew every January 1. But no action required is not the same as no changes happening. Read the Annual Notice of Change your plan sends each September before deciding to stand pat for another year.

Q: Can you change Medicare plans after open enrollment?

Sometimes. If you are in a Medicare Advantage plan, the MA Open Enrollment Period from January 1 through March 31 allows one switch. Outside that, you need a Special Enrollment Period trigger such as moving, losing other coverage, your plan leaving your area, or qualifying for Extra Help. Otherwise you wait for the next October 15.

Q: What happens if you miss your Initial Enrollment Period?

You wait for the General Enrollment Period, January 1 through March 31, unless a Special Enrollment Period applies. The big exception: if you kept working past 65 with employer group coverage, you get an 8-month window to add Part B penalty-free after that employment or coverage ends.

Medicare doesn't have one open enrollment — it has five windows, each doing a different job. The 7 months around your 65th birthday, October 15 – December 7 every fall, two January 1 – March 31 periods that people constantly mix up, and the special windows in between. Here's the whole calendar.

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Overview

Medicare Enrollment Dates for 2026 at a Glance

The Medicare enrollment dates that matter in 2026: your Initial Enrollment Period is the 7 months around your 65th birthday, the Annual Enrollment Period runs October 15 – December 7, and two more windows — the Medicare Advantage Open Enrollment Period and the General Enrollment Period — both run January 1 – March 31. Everything outside those dates requires a Special Enrollment Period triggered by a life event.

FreedInsure LLC (NPN: 20230457) is an independent brokerage licensed in 42 states. Medicare's calendar is federal, so these dates are the same in every state. And if you're not 65 yet — retiring early, bridging a gap, covering a younger spouse — a completely different calendar governs you: our special enrollment period guide covers the under-65 marketplace rules. Not sure which calendar applies? Call (844) 788-3733.

Quick answer: The key Medicare enrollment dates are: a 7-month Initial Enrollment Period around your 65th birthday, the Annual Enrollment Period October 15 – December 7, the Medicare Advantage Open Enrollment Period January 1 – March 31, and the General Enrollment Period January 1 – March 31. Special Enrollment Periods cover life events in between. Miss them all and you wait — often with a late penalty attached.

The Full Calendar

What Are the 3 Enrollment Periods for Medicare?

The three people usually mean are the Initial Enrollment Period (7 months around your 65th birthday), the Annual Enrollment Period (October 15 – December 7), and the Medicare Advantage Open Enrollment Period (January 1 – March 31). But the honest count is five: the General Enrollment Period and Special Enrollment Periods complete the calendar, and mixing them up is how people end up with lifelong penalties.

Enrollment Period	2026 Dates	Who It's For	What You Can Do
Initial Enrollment Period (IEP)	7 months: the 3 months before your 65th-birthday month, that month, and the 3 after	Anyone turning 65	Enroll in Part A, Part B, Part D, or a Medicare Advantage plan for the first time
Annual Enrollment Period (AEP)	October 15 – December 7	Everyone already on Medicare	Switch Medicare Advantage plans, move between Original Medicare and MA, join/switch/drop Part D — effective January 1
Medicare Advantage Open Enrollment (MA OEP)	January 1 – March 31	Only people already in a Medicare Advantage plan	One switch to another MA plan, or drop back to Original Medicare and add Part D
General Enrollment Period (GEP)	January 1 – March 31	People who missed their IEP with no SEP	Sign up for Part A and/or Part B; coverage starts the month after you enroll; late penalties may apply
Part D Windows	During your IEP, every AEP, and some SEPs	Anyone who wants drug coverage	Join, switch, or drop a standalone drug plan; going 63+ days without coverage triggers a penalty
Special Enrollment Periods (SEP)	Varies — typically 2–8 months after the event	People with qualifying events (working past 65, moving, losing coverage)	Enroll or switch outside every standard window above

Notice the trap: two entirely different windows share the January 1 – March 31 dates. One is for people who already have Medicare Advantage and want out; the other is for people who never signed up at all. Same dates, opposite audiences — we untangle both below.

October 15 – December 7

When Is the Medicare Annual Enrollment Period?

The Medicare Annual Enrollment Period runs October 15 through December 7 every year, with every change taking effect January 1. It's the one window open to everyone already on Medicare — the window most people mean when they say "Medicare open enrollment" or "fall open enrollment."

During AEP you can switch from one Medicare Advantage plan to another, move from Original Medicare into Medicare Advantage (or back), and join, switch, or drop a Part D drug plan. It's also the only regular chance each year for someone on Original Medicare to change their standalone drug plan — which matters, because drug plan formularies and pharmacy networks are redrawn every single year.

One thing AEP does not do: it doesn't give you a guaranteed right to buy a Medigap (Medicare Supplement) policy. Your guaranteed-issue Medigap window is generally the 6 months after Part B starts; outside that, most states allow medical underwriting. People conflate the two constantly, and it's an expensive mix-up.

January 1 – March 31

What Is the Medicare Advantage Open Enrollment Period?

The Medicare Advantage Open Enrollment Period runs January 1 – March 31 and is only for people already enrolled in a Medicare Advantage plan on January 1. It allows exactly one switch: to a different Medicare Advantage plan, or back to Original Medicare plus a standalone Part D plan.

Think of it as the buyer's-remorse window. If the plan you picked in the fall turns out to exclude your cardiologist or re-tier a prescription, you get one do-over in the first quarter. What you can't do here: move from Original Medicare into Medicare Advantage, or swap standalone drug plans — those moves wait for the fall AEP.

The General Enrollment Period Shares the Same Dates

The Medicare General Enrollment Period also runs January 1 – March 31, but it serves the opposite audience: people who missed their Initial Enrollment Period and don't qualify for a Special Enrollment Period. You can sign up for Part A and/or Part B, and coverage starts the month after you enroll. The catch is the price of being late — the Part B late penalty adds roughly 10% to your premium for each full 12-month period you went without, and it typically lasts as long as you have Part B.

📆 Missing the 7-Month IEP

No employer coverage at 65 and no enrollment? You wait for the General Enrollment Period — and the ~10% per year Part B penalty follows you for life. The IEP is the one window you truly cannot afford to blow.

🔄 Confusing the Two January Windows

MA Open Enrollment is for switching coverage you already have; the General Enrollment Period is for first-time Part A/B signup. Same dates, completely different jobs — and neither lets you join Medicare Advantage from Original Medicare.

📩 Ignoring the ANOC

Your plan mails an Annual Notice of Change every September. Premiums, drug tiers, copays, and networks reset January 1 whether you read it or not. Ten minutes with the ANOC is the highest-ROI reading a retiree does all year.

⚠️ Assuming AEP Covers Medigap

The fall window gives no right to buy a Medigap policy. Your guaranteed-issue window is generally the 6 months after Part B starts; after that, health questions can apply in most states.

Straight Talk

Do You Have to Enroll in Medicare Every Year?

No — you do not have to re-enroll in Medicare every year. Original Medicare continues automatically, and Medicare Advantage and Part D plans renew each January 1 unless you actively change them. The Annual Enrollment Period is an option, not an obligation.

Straight talk: auto-renewal is exactly where plans quietly get worse. Nobody cancels you — your premium ticks up, a drug moves to a pricier tier, your pharmacy falls out of the preferred network, and it all takes effect January 1 while you weren't looking. The Annual Notice of Change arrives each September for a reason. You don't have to re-enroll every year, but you should re-check every year — it's a 15-minute read that regularly saves hundreds.

Life doesn't always follow the calendar. Working past 65 with employer group coverage, moving out of your plan's service area, losing Medicaid, or your plan leaving your county each trigger a Medicare Special Enrollment Period with its own clock — some run 2 months, while the post-employment Part B window runs a full 8 months. The triggers and deadlines get their own breakdown in our Medicare Special Enrollment Period guide.

One last calendar collision: ACA marketplace open enrollment (November 1 – January 15) is a separate system with separate dates. If you're under 65 — retiring early, between jobs, covering a younger spouse — those are the dates that govern you, and our missed open enrollment guide covers what to do outside them. Confused about which side of the line you're on? That's a 5-minute phone call: (844) 788-3733.

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FAQ

Frequently Asked Questions

What are the 3 enrollment periods for Medicare?

The Initial Enrollment Period, the Annual Enrollment Period, and the Medicare Advantage Open Enrollment Period. The IEP is the 7 months around your 65th birthday; AEP runs October 15 – December 7; MA Open Enrollment runs January 1 – March 31. The full calendar adds two more: the General Enrollment Period and Special Enrollment Periods.

When is Medicare open enrollment for 2026?

October 15 – December 7. "Medicare open enrollment" is the everyday name for the Annual Enrollment Period, and it runs the same dates every fall. Changes you make — switching Medicare Advantage plans, moving between Original Medicare and MA, or changing Part D drug plans — take effect January 1.

What is the Medicare Advantage Open Enrollment Period?

January 1 – March 31, for people already enrolled in a Medicare Advantage plan. It allows one switch: to a different MA plan, or back to Original Medicare plus a standalone Part D plan. You can't use it to jump from Original Medicare into Medicare Advantage — that move waits for the fall AEP.

What is the Medicare General Enrollment Period?

January 1 – March 31, for people who missed their Initial Enrollment Period and don't qualify for a Special Enrollment Period. You can sign up for Part A and/or Part B, with coverage starting the month after you enroll. A late penalty of roughly 10% per 12 months of delay is usually added to Part B for life.

Do you have to enroll in Medicare every year?

No. Original Medicare continues automatically, and Medicare Advantage and Part D plans auto-renew every January 1. But "no action required" isn't the same as "no changes happening" — read the Annual Notice of Change your plan sends each September before deciding to stand pat for another year.

Can you change Medicare plans after open enrollment?

Sometimes. If you're in a Medicare Advantage plan, the MA Open Enrollment Period (January 1 – March 31) allows one switch. Outside that, you need a Special Enrollment Period trigger — moving, losing other coverage, your plan leaving your area, or qualifying for Extra Help. Otherwise you wait for the next October 15.

When is the Medicare Part D enrollment period?

First during your 7-month Initial Enrollment Period, then every fall October 15 – December 7. You can also add Part D if you drop a Medicare Advantage plan during MA Open Enrollment. Going 63+ days without creditable drug coverage adds a penalty of about 1% of the national base premium per month — permanently.

What happens if you miss your Initial Enrollment Period?

You wait for the General Enrollment Period (January 1 – March 31) unless a Special Enrollment Period applies. The big exception: if you kept working past 65 with employer group coverage, you get an 8-month window to add Part B penalty-free after that employment or coverage ends.

Is Medicare open enrollment the same as ACA open enrollment?

No — they're separate systems with separate dates. Medicare's fall window runs October 15 – December 7; ACA marketplace open enrollment runs November 1 – January 15. They overlap on the calendar, which is exactly why families mix them up. Medicare covers you at 65+; the marketplace covers you before that.

When does coverage start after I enroll?

It depends on the window. AEP changes start January 1. General Enrollment Period signups start the month after you enroll. During your Initial Enrollment Period, enrolling before your birthday month typically starts coverage the month you turn 65; enrolling later pushes the start date back. We can map your exact dates — call (844) 788-3733.

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