October 15 – December 7
Medicare Annual Enrollment Guide 2027: dates, changes & what to review.
One window a year lets you reset your Medicare coverage from scratch. Here’s when it opens, what tends to shift, and a straightforward way to make sure your 2027 plan actually fits.
Every fall, Medicare gives everyone enrolled the same opportunity: a set window to keep, switch, or drop coverage for the year ahead, no questions asked about health history. This is Medicare’s Annual Enrollment Period — sometimes called Open Enrollment — and it runs the identical dates every single year: October 15 through December 7, confirmed directly on CMS’s official site.
Anything you select during that window takes effect January 1, which means this year’s enrollment period is really about choosing your Medicare coverage for 2027. It’s easy to let it pass quietly if last year’s plan felt adequate — but “felt adequate” and “still your best option” aren’t guaranteed to be the same thing, and this guide walks through how to actually check.
What makes this window worth treating seriously is that plans genuinely do change underneath you, whether or not you go looking. A premium can shift, a medication can move to a different pricing tier, a favorite doctor can quietly leave a network — none of it requires you to have done anything wrong, and none of it waits for you to notice on its own.
A short checklist before you decide
Open your Annual Notice of Change
Every plan mails this each September, spelling out exactly what’s different about your coverage heading into next year. It’s the fastest single source for what’s actually changing, and it’s also the document most people set aside without reading.
Re-check your prescription drug list
Match your current medications against your plan’s updated formulary and its pricing tiers for next year. A drug that cost you little this year can shift tiers with barely any warning.
Verify your doctors are still in-network
Provider networks get revised annually, even for plans you haven’t touched. Confirm your usual doctors and any specialists are still covered rather than assuming last year’s answer still holds.
Total up the real yearly cost
Premium, deductible, expected copays, and the out-of-pocket maximum together give a far more honest picture than the premium alone ever will.
Look at what extras are actually included
Dental, vision, and hearing add-ons vary widely between plans and shift year to year. Confirm the specifics rather than trusting a plan’s marketing summary.
Glance at the plan’s star rating
It’s not the full picture, but a plan with a consistently weak rating in your area is worth a second look before you re-commit to it for another twelve months.
What usually shifts from one year to the next
The specifics differ by carrier and plan, but the categories that move are consistent year after year.
Medicare plan changes for the coming year typically show up in the same handful of places: premiums and deductibles, drug formularies and their pricing tiers, provider networks, and whatever extra benefits a plan decides to offer. None of these are guaranteed to move on any specific plan — but assuming nothing changed without actually checking is exactly how people end up quietly stuck with a worse fit than they realize.
That’s also why two plans that looked nearly identical last year can diverge meaningfully by the time this year’s Annual Notice of Change goes out. Coverage doesn’t stay static just because you didn’t touch it — the plan itself keeps moving underneath you.
How to actually compare plans for 2027
Once you know what’s changed, the comparison itself is a short, repeatable process.
Start with your current medications and doctors, then check each one against a plan’s updated formulary and network before you even glance at the price. Comparing Medicare Advantage plans specifically means running that same list against every option sold in your county, not just the couple of names you already recognize from mail or television.
Changing plans during this window is simpler than most people expect — enroll through Medicare.gov, by phone, or through a licensed agent, and the new coverage takes over automatically on January 1. There’s no separate step to “cancel” the old plan; enrolling in the new one handles that for you.
Know your options before comparing
Before diving into specific plans, it helps to understand what each piece of Medicare actually does.
Comparing plans doesn’t have to be a solo project
Working through a full plan comparison alone, across everything available in your county, takes real time — more than most people expect to spend in a seven-week window. A licensed insurance agent can run your specific doctors and prescriptions against every option in your area and show you the real differences side by side.
This kind of enrollment help typically costs nothing out of pocket, since a licensed agent is generally paid by the insurance carrier rather than by you. A short consultation can often turn a long, confusing list of plans into two or three real contenders in a single conversation — genuine plan comparison help, without the guesswork.
Questions people tend to ask
What is Medicare Annual Enrollment?
It’s the yearly stretch when anyone with Medicare can review, switch, or keep their coverage for the following plan year — available to everyone, with no health questions involved.
When is Medicare Open Enrollment for 2027?
October 15 through December 7, the same dates every year, for coverage that starts the following January 1. You can browse plans through Medicare’s official Plan Finder tool once each year’s plan details are published.
Can I change my Medicare plan during AEP?
Yes — you can switch between Medicare Advantage plans, move between Medicare Advantage and Original Medicare, add or change a Part D plan, or leave everything exactly as it is.
What Medicare changes should I look for in 2027?
Focus on your Annual Notice of Change first — it will flag any shifts to your premium, deductible, drug formulary, network, or extra benefits specific to your plan.
Should I review my Medicare plan every year?
Yes. Even a plan you’re satisfied with can quietly shift in cost, formulary, or network from one year to the next, so a yearly check is worth building into the habit.
How do I compare Medicare Advantage plans for 2027, and can I switch during AEP?
Run your current doctors and prescriptions against every plan available in your county, not just the ones you already recognize. And yes — switching to a different Medicare Advantage plan is one of the most common changes people make during this window.
What happens if I do nothing during Medicare Annual Enrollment?
In most cases your current plan simply rolls into the next year automatically. The real risk isn’t losing coverage — it’s staying on a plan that’s quietly become a weaker fit than something else now available where you live.
The bottom line
Annual Enrollment isn’t paperwork for its own sake — it’s the one guaranteed chance each year to make sure your coverage still lines up with your doctors, your prescriptions, and your budget. Treat it as an active decision even in a year your plan seems fine, since “seems fine” and “still the strongest option available” aren’t always the same answer.
Mark the window now. October 15 through December 7 arrives faster than it feels like it should, and whatever you choose during it is what you’ll be living with for all of 2027.
If you’d rather not run the comparison alone, a licensed agent can walk through your options side by side — at no cost to you, before the December 7 deadline closes.