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Medicare Annual Enrollment Guide 2027: Dates, Changes & What to Review

Get ready for Medicare Annual Enrollment 2027. Learn important dates, plan changes, coverage options, and what to review before choosing your Medicare plan.

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September 29, 2026
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Andrew Faligowski
Medicare Annual Enrollment Period Guide 2027 | Agents Impact

October 15 – December 7

The Medicare Annual Enrollment Guide 2027.

Once a year, you get to reset your Medicare coverage for the year ahead. Here's exactly what changes, what to check, and how to choose your Medicare plans for 2027 with confidence.

So, what is Medicare Annual Enrollment Period 2027, exactly? It's the yearly window — Medicare AEP 2027 — every person with Medicare gets to review their coverage and make changes for the coming plan year, regardless of health history or prior decisions. When is Medicare Open Enrollment 2027? It runs the same dates every year: October 15 through December 7, as confirmed directly by CMS, the federal agency that runs Medicare.

Coverage chosen during this window takes effect January 1 — meaning this fall's Annual Enrollment Period is when you're actually selecting your Medicare coverage 2027. Whether you're happy with your current plan or considering a change, it's worth treating this window as an active decision rather than something to let pass by default.

It's easy to let this window slide by, especially if last year's plan felt fine. But "felt fine" and "still the best available option" aren't the same statement, and the only way to know which one applies to you is to actually look. This guide walks through exactly what to check, what tends to shift year to year, and where to go if you'd rather not do the comparison entirely on your own.

Your Medicare Annual Enrollment checklist 2027

01

Read your Annual Notice of Change

Every plan sends this each September, outlining exactly what's shifting in your coverage for the coming year — premiums, formulary, and network changes included. It's the single most useful document for what to review during Medicare Annual Enrollment, and it's also the one most people file away unread.

02

Check your prescription drug list

Run your current medications against your plan's updated formulary and pricing tiers. A drug that was affordable last year can move tiers without much warning.

03

Confirm your doctors are still in-network

Provider networks shift year to year, even on plans you haven't changed. Confirm your preferred doctors and specialists are still covered before assuming nothing changed.

04

Compare your total costs, not just the premium

Add up premium, deductible, expected copays, and out-of-pocket maximum together for a realistic picture — not just the number on the brochure's cover.

05

Look at extra benefits available to you

Dental, vision, hearing, and other add-on benefits vary a lot between plans and change from year to year. Confirm what's actually included, not just advertised.

06

Check the plan's star rating

Medicare rates every plan from one to five stars based on quality and member satisfaction. It's not the whole picture, but a plan with a consistently low rating in your area is worth a second look before you commit to it for another year.

What tends to shift with Medicare plan changes 2027

The specifics vary by plan and carrier, but the categories that shift are consistent every year.

Medicare changes for 2027 typically show up in a handful of predictable places: premium and deductible amounts, prescription drug formularies and pricing tiers, provider networks, and the extra benefits a plan chooses to offer. None of these are guaranteed to change on any specific plan, but assuming nothing changed without checking is exactly how people end up with a mismatched plan without realizing it.

This is also why Medicare benefits 2027 can look meaningfully different from one carrier to the next, even within the same county. Two plans that were nearly identical last year can diverge significantly by the time next year's Annual Notice of Change goes out — which is exactly the gap this Annual Enrollment window exists to catch.

How to compare Medicare plans for 2027

Once you know what changed, the actual comparison comes down to a short, repeatable process.

Wondering how to choose a Medicare plan for 2027? Start with your current medications and doctors, then check each against a plan's updated formulary and network before looking at price. How to compare Medicare Advantage plans for 2027 specifically means running that same list against every plan available in your county, not just the one or two you already recognize by name.

Knowing how to change Medicare plans during AEP is straightforward once you've picked a new one — enroll through Medicare.gov, over the phone, or through a licensed agent, and the new coverage takes over automatically on January 1. There's no need to separately "cancel" your old plan; enrolling in a new one does that for you.

Know your options before you compare

Before diving into specific plans, it helps to understand how each piece of Medicare fits together.

Medicare

The federal foundation every plan builds on.

Learn more →

Medicare Advantage

Bundled private-plan alternative to Original Medicare.

Learn more →

Medicare Supplement

Fills Original Medicare's cost-sharing gaps.

Learn more →

Medicare Part D

Standalone prescription drug coverage.

Learn more →

Dental & Vision

Coverage Original Medicare leaves out entirely.

Learn more →

Comparing plans is easier with local help

You don't have to work through Medicare plan comparison 2027 alone. A licensed insurance agent near you can run your specific doctors and prescriptions against every plan available in your county — something that's genuinely hard to do thoroughly on your own within a seven-week window.

Medicare enrollment help and Medicare plan assistance typically cost nothing out of pocket, since a licensed insurance agent is generally compensated by the carrier rather than by you. A short Medicare consultation can usually narrow a long list of options down to two or three real contenders in a single conversation — real Medicare plan comparison help, without the guesswork.

Questions people usually ask

What is Medicare Annual Enrollment?
It's the yearly window when anyone with Medicare can review, change, or keep their coverage for the following plan year — no health questions required, regardless of past decisions.

When is Medicare Open Enrollment for 2027?
October 15 through December 7, the same window every year, for coverage beginning the following January 1. You can browse and compare plans on Medicare's official Plan Finder tool once information becomes available each fall.

Can I change my Medicare plan during AEP?
Yes — you can switch Medicare Advantage plans, move between Medicare Advantage and Original Medicare, join or change a Part D plan, or keep everything exactly as it is.

Can I switch Medicare Advantage plans during AEP?
Yes, this is one of the most common changes made during the window — switching to a different Medicare Advantage plan with a better network, formulary, or set of extra benefits for the coming year.

Should I review my Medicare plan every year?
Yes. Even a plan you're happy with can shift in cost, formulary, or network from one year to the next, so an annual review — even a quick one — is worth the habit.

What happens if I do nothing during Medicare Annual Enrollment?
In most cases, your current plan simply continues into the next year. The risk isn't losing coverage — it's staying on a plan that's quietly become a worse fit than something else now available to you.

The bottom line

Medicare Annual Enrollment isn't a formality — it's the one guaranteed window each year to make sure your coverage still matches your doctors, your prescriptions, and your budget. Treat it as an active decision, even in years your plan seems fine, since "seems fine" and "still the best option" aren't always the same thing.

Mark the window now, before it's crowded out by everything else the fall brings — October 15 through December 7 comes around fast, and the plans you're comparing today are the ones you'll be living with for all of 2027.

If you'd rather have someone else run the comparison with you, a licensed agent can walk through your Medicare plans for 2027 side by side — at no cost to you, before the December 7 deadline passes.

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