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Medicare AEP 2026: Key Dates, Rules, and What's New

Senior organizing medications and Medicare cards

The 2026 Medicare Annual Enrollment Period runs October 15 through December 7, and any change you make during that window takes effect January 1, 2026. This year’s headline change is the Part D redesign: a $2,100 annual out-of-pocket cap on covered drugs and a maximum Part D deductible of $615. Once you hit that cap, covered Part D drugs cost you nothing for the rest of the year.

Start comparing plans as soon as Medicare’s Plan Finder tool refreshes with final 2026 plan data on October 1. That gives you two full weeks before AEP even opens to look at premiums, drug lists, and provider networks before you’re rushed.

Quick facts to anchor your planning:

  • AEP window: October 15 to December 7, 2026
  • Effective date: January 1, 2026, no matter when during AEP you enroll
  • Part D out-of-pocket cap: $2,100 for covered drugs
  • Part D maximum deductible: $615 (some plans set it lower or waive it)
  • Plan comparisons open: October 1, via Medicare Plan Finder

Pro Tip: Enrolling on October 16 gets you the exact same January 1 start date as enrolling on December 6. Use the extra weeks to actually read your Annual Notice of Change instead of rushing a decision.

Key Takeaways

The 2026 Medicare AEP runs October 15 through December 7, and pairing that window with the new $2,100 Part D out-of-pocket cap and $615 deductible ceiling determines how much your prescriptions will actually cost next year.

Point Details
Mark the window AEP runs October 15 to December 7, 2026; all accepted changes take effect January 1.
Read your ANOC first Your Annual Notice of Change arrives in September and flags cost and coverage shifts before you compare anything else.
Know the 2026 Part D numbers The $2,100 out-of-pocket cap and $615 maximum deductible reshape which plan structure saves you the most.
Compare with your real data Load your actual prescriptions and pharmacy into Medicare Plan Finder rather than sorting by premium alone.
Get local guidance Mountaintop Insurance offers free Central Oregon consultations to review your ANOC and handle enrollment paperwork directly.

Table of Contents

What Is Medicare AEP 2026 and Who Can Use It?

The Annual Enrollment Period, sometimes called the Annual Election Period, is the one stretch of the year when nearly every Medicare beneficiary can change their coverage for any reason, no questions asked. You don’t need a qualifying life event. You don’t need to explain yourself to anyone. You just need to act within the window.

AEP is built for people already enrolled in Medicare who want to adjust what they have. That’s a critical distinction: this isn’t the period for signing up for Medicare for the first time (that’s your Initial Enrollment Period, tied to turning 65). It’s for people who already have Part A, Part B, a Medicare Advantage plan, or a standalone Part D plan and want something different for the coming year.

During AEP, you can:

  • Switch from one Medicare Advantage plan to another
  • Move from Medicare Advantage back to Original Medicare
  • Move from Original Medicare into a Medicare Advantage plan
  • Join, drop, or switch a Part D prescription drug plan

It helps to understand how AEP sits next to Medicare’s other enrollment windows, because people mix them up constantly. The Medicare Advantage Open Enrollment Period, which runs January 1 through March 31, is much narrower. It only applies if you’re already in a Medicare Advantage plan, and it only lets you switch to a different MA plan or drop back to Original Medicare. You can’t use it to join a stand-alone Part D plan from Original Medicare. Special Enrollment Periods are different still. They’re triggered by specific life events (moving, losing employer coverage, qualifying for Medicaid) and are available whenever that event happens, not tied to a calendar window at all.

If you skim just one distinction from this section, make it this: AEP is the wide-open, no-excuses-needed window. Everything else on the Medicare calendar comes with restrictions on who qualifies or what you’re allowed to change. That’s exactly why insurers, agents, and Medicare itself put so much emphasis on these seven weeks. It’s the one shot most beneficiaries get each year to reset their coverage from the ground up.

2026 AEP Calendar and Key Planning Dates

Treat AEP less like a single deadline and more like a six week to two month process with checkpoints. Missing an early checkpoint doesn’t disqualify you, but it usually means a rushed decision in early December.

  1. September: Your current plan mails you an Annual Notice of Change. Read it before you do anything else. It spells out exactly how your premium, deductible, drug tiers, and provider network are changing for 2026.
  2. October 1: Medicare’s Plan Finder tool updates with finalized 2026 plan data. This is your green light to start serious comparisons, even though you can’t submit a change yet.
  3. October 15: AEP opens. You can now formally submit changes.
  4. December 7: AEP closes. Your plan must receive your request by this date, not simply have it postmarked or started.
  5. January 1, 2026: Every accepted change takes effect, and your new plan year begins.
  6. January 1 to March 31, 2026: The Medicare Advantage Open Enrollment Period opens for anyone who wants a second look after AEP, though it’s limited to MA-to-MA switches or a return to Original Medicare.
Date What Happens
September 2026 ANOC letters arrive detailing 2026 plan changes
October 1, 2026 Plan Finder updates with final 2026 plan details
October 15, 2026 AEP officially opens
December 7, 2026 AEP closes; plan must receive your request
January 1, 2026 New coverage and 2026 costs take effect

Special Enrollment Periods run outside this calendar entirely, triggered by events like a move or a loss of coverage rather than a fixed date.

What Can You Actually Change During AEP?

The permissions differ depending on what you’re enrolled in right now, and mixing them up is one of the more common enrollment mistakes.

If you currently have Medicare Advantage

You can switch to a different Medicare Advantage plan, whether that means chasing a lower premium, a broader provider network, or better drug coverage. You can add or drop Part D drug coverage bundled into your MA plan. And you can leave Medicare Advantage altogether and return to Original Medicare, pairing it with a stand-alone Part D plan if you want drug coverage.

If you currently have Original Medicare

You can join a Part D prescription drug plan for the first time, switch from one Part D plan to another, or move into a Medicare Advantage plan instead. This is also the moment plenty of people discover that adding Part D isn’t automatic. If you never enrolled and don’t have other creditable drug coverage, you may be carrying a late enrollment penalty that follows you regardless of which plan you pick.

Where Medigap gets tricky

Medigap, also called Medicare Supplement insurance, isn’t governed by AEP rules at all. Federal guaranteed-issue protections mostly apply during your six-month Medigap Open Enrollment Period right after you turn 65 and enroll in Part B. Outside that window, insurers in most states can medically underwrite you, meaning they can deny coverage or charge more based on health history.

Medicare Supplement insurance cards on rustic table

Oregon is an exception worth knowing if you’re a Central Oregon resident. The state’s Medigap Birthday Rule gives current Medigap policyholders an annual 30-day window around their birthday to switch to a plan with equal or lesser benefits, without medical underwriting. It’s not tied to AEP, and it’s not available to people without an existing Medigap policy, but it’s a real, state-specific opportunity that a national call center agent outside Oregon may not even mention.

Pro Tip: If you’re on Medigap and considering a switch, mark your birthday on the calendar every year. Oregon’s Birthday Rule window is short, and it closes whether or not you remembered it existed.

Why the fine print matters after you switch

Every one of these changes carries downstream consequences that don’t show up until you try to use your new coverage. A Medicare Advantage plan with a great premium might exclude your cardiologist from its network. A Part D plan with low copays might require prior authorization or step therapy for the exact drug you take every day. None of that shows up in a headline premium comparison. It shows up in January, at the pharmacy counter or in a doctor’s waiting room, which is precisely why comparing plans properly matters more than comparing prices.

The 2026 Part D Redesign: What Changed and Why It Matters

The Inflation Reduction Act reshaped Part D over the last few years, and 2026 locks in the next round of those changes. Two numbers drive almost everything else: the $2,100 out-of-pocket cap and the $615 maximum deductible.

Here’s what the cap actually does in practice. Once your true out-of-pocket spending on covered Part D drugs hits $2,100 in a calendar year, you enter the catastrophic phase, and your covered drugs cost you $0 for the rest of the year. That’s a hard ceiling. It doesn’t matter whether you’re on an expensive specialty medication or a handful of generics; once you cross that line, the meter stops.

The redesign changes who benefits most from which plan structure. Beneficiaries with stable, low-cost prescriptions may do better with a plan that skips the deductible entirely, while people managing high-cost or specialty drugs tend to come out ahead once they clear the $2,100 threshold and stop paying anything at all.

The deductible side works differently. For 2026, no Part D plan can charge a deductible above $615, but plans are free to set something lower, or waive it completely. That’s a real design choice insurers make, and it’s exactly why two plans with similar premiums can produce very different total costs depending on your prescription list.

Coverage in 2026 still moves through phases, even though the redesign flattened some of the old structure. You typically start in the deductible phase (up to $615, if your plan charges one), move into initial coverage where you and your plan share costs, and then hit the catastrophic phase once you reach the $2,100 out-of-pocket cap. What changed under the redesign is that the old “coverage gap,” commonly known as the donut hole, effectively disappears as a separate, more expensive phase. The Medicare Drug Price Negotiation Program, detailed in CMS’s final CY 2026 program instructions, is also starting to influence formularies, since negotiated prices on select drugs can shift how insurers structure their tiers.

Diagram of 2026 Medicare Part D coverage phases and caps

None of this matters in the abstract. It matters when you sit down with your actual drug list. Pull up each plan’s formulary, or better yet, use the Medicare Plan Finder and enter every prescription you take along with your pharmacy. The tool estimates your total yearly cost, not just the premium, factoring in the deductible, copays, and how close you’ll get to that $2,100 cap. Skipping this step and picking a plan on premium alone is how people end up paying far more than they expected by October of next year.

How to Compare Medicare Plan Options for 2026

Comparing plans properly means working through a short list in a specific order, not eyeballing premiums and calling it done.

Here’s the priority checklist, roughly in the order it should matter to you:

  1. Total estimated yearly cost, not just the monthly premium. This includes deductibles, copays, and projected drug spending.
  2. Formulary coverage for every medication you currently take, checked by name and dosage, not drug class.
  3. Pharmacy access, since preferred pharmacy networks can swing your copay significantly.
  4. In-network providers, especially specialists you see regularly.
  5. Prior authorization and step therapy rules attached to your specific drugs or planned procedures.
  6. Maximum out-of-pocket limit for Medicare Advantage plans, which caps your worst-case annual spending.

Your Annual Notice of Change and Evidence of Coverage are the two documents that make this process manageable instead of overwhelming to sort through. The ANOC tells you what’s different about your current plan next year; the EOC spells out the full rulebook for how that plan works. Comparing this year’s ANOC against last year’s EOC often reveals a formulary tier change or a new prior authorization requirement that never made it into any marketing material.

The Medicare Plan Finder is built to handle steps one through three for you, provided you use it correctly:

  • Enter your ZIP code and confirm your county
  • Add every prescription drug you take, including dosage and frequency
  • Add your preferred pharmacy or pharmacies
  • Review the ranked list, sorted by estimated total annual cost, not premium

Skipping the prescription entry step is the single most common way people misuse this tool. Without your actual drug list loaded in, the ranking defaults to premium-based sorting, which can put the worst plan for your situation at the very top.

If you’re working with a licensed agent or calling a plan directly, come prepared with pointed questions: Is my specific drug covered at this tier, and does it require prior authorization? Is my primary care doctor and specialist in-network for next year, not just this year? What’s the maximum out-of-pocket limit, and does it include Part B drugs administered in-office? Treat vague answers, or an agent who steers you toward one plan without walking through your specific medications, as a red flag worth pushing back on.

Pro Tip: Call your pharmacy directly and ask what a plan’s formulary tier actually means in dollars for your specific prescriptions. Tier names like “preferred generic” sound reassuring but tell you nothing about your actual copay.

How Do You Enroll in Medicare Coverage for 2026?

You have four legitimate channels to make an AEP change, and each has its own rhythm.

  1. Online through Medicare.gov Plan Finder. After you’ve compared plans and settled on one, the Plan Finder lets you enroll directly for most Medicare Advantage and Part D plans. You’ll need your Medicare number, the effective dates for Part A and Part B, and a list of your current prescriptions to complete the process in one sitting.
  2. By phone through 1-800-MEDICARE. Available 24 hours a day, this line can process most enrollment changes directly, or route you to the plan’s own customer service line if the plan handles enrollment separately. Have your Medicare card and Social Security number ready.
  3. Through a licensed agent. A local, licensed agent can walk through your options in person or remotely, compare plans against your actual medications and providers, and submit the enrollment on your behalf. Bring your Medicare card, a current list of medications with dosages, and your ANOC letter to make the conversation productive rather than exploratory.
  4. By paper application. Some plans still accept mailed enrollment forms. If you go this route, mail early. Medicare requires the plan to receive your request by December 7, not simply postmark it by that date. Certified mail with tracking gives you proof of when it arrived.

Whichever channel you use, don’t consider the change final until you’ve confirmed it. Most plans send a confirmation letter or enrollment acknowledgment within a couple of weeks. If you haven’t heard anything by mid-December, call the plan directly and verify your application was received and processed before the year turns over.

Pro Tip: Screenshot or print your online enrollment confirmation the moment you submit it. If there’s ever a dispute about timing, that timestamp is your best evidence.

What Happens if You Miss the AEP Deadline?

Missing December 7 isn’t necessarily the end of your options, but it does narrow them considerably.

If you’re already in a Medicare Advantage plan, the Medicare Advantage Open Enrollment Period gives you a second chance from January 1 through March 31. It only allows a switch to a different MA plan or a return to Original Medicare, and you can’t use it to pick up a stand-alone Part D plan if you’re not already in an MA plan with drug coverage.

Beyond that, Special Enrollment Periods cover specific circumstances outside your control:

  • Moving out of your current plan’s service area
  • Losing employer or union coverage
  • Gaining or losing Medicaid eligibility
  • Moving into or out of a nursing home or long-term care facility
  • Your plan losing its Medicare contract or reducing service area

Each of these typically requires documentation, such as a lease showing your move date or a letter confirming your coverage loss, so keep paperwork organized if you think you qualify.

There’s also a narrower, less commonly used option tied to plan quality: a five-star Special Enrollment Period lets you switch into a five-star rated Medicare Advantage or Part D plan once during the year, outside AEP, if one is available in your area. Five-star plans are rare enough that this rarely applies, but it’s worth a quick check on Medicare’s site if you’re stuck after December 7.

If you’re unsure whether you qualify for any of these, the practical next step is a direct call to Medicare or a conversation with a licensed agent who can check eligibility against your specific situation rather than guessing from a general list.

How Mountaintop Insurance Supports You Through AEP

Mountaintop Insurance runs free consultations for Central Oregon residents navigating Medicare decisions, and the approach is built around explaining options clearly rather than pushing a particular plan. That means walking through your Annual Notice of Change with you, comparing your current coverage against 2026 alternatives, and handling the actual enrollment paperwork once you’ve decided.

Consultations happen in person or remotely, and there’s no cost whether or not you ultimately enroll through the agency.

A local agent earns their keep on the situations that don’t fit a national call center script:

  • Timing a Medigap switch around Oregon’s Birthday Rule window
  • Sorting out dual-eligibility questions when someone qualifies for both Medicare and Medicaid
  • Navigating an IRMAA appeal after a life-changing income event
  • Coordinating Part D enrollment with existing employer or retiree drug coverage

A plan that looks identical on paper can behave very differently once your specific prescriptions, providers, and income situation get factored in. That’s where a local conversation tends to catch what a generic comparison tool misses.

If you want a refresher on how Medicare’s parts fit together before your consultation, Mountaintop Insurance’s guide to Medicare Parts explained is a useful starting point.

Editorial Take: What Actually Matters This AEP

Most AEP coverage treats the seven week window as a race, urging beneficiaries to act fast. That framing gets the incentive backward. There’s no reward for enrolling on October 15 instead of December 6, since every accepted change lands on the same January 1 start date. The real risk isn’t moving too slowly. It’s deciding too fast, based on a premium number that ignores your actual drug list.

The 2026 Part D redesign makes this more consequential, not less. A $2,100 cap and a $615 deductible ceiling sound like simplifications, and in some ways they are, but they also mean the gap between a well matched plan and a poorly matched one shows up faster in your wallet. Read your ANOC. Load your real prescriptions into Plan Finder. Ask about prior authorization before you switch, not after your first denied claim.

The conventional advice to “compare plans” is true but useless without specifics. Compare your plans, against your medications, your pharmacy, your doctors. That’s the only comparison that predicts what January actually looks like.

Get Local Help Choosing Your 2026 Medicare Coverage

Comparing dozens of Medicare Advantage and Part D plans through a national call center often means talking to someone who has never set foot in Central Oregon and has no idea whether your doctor is in-network locally. Mountaintop Insurance works differently: it’s a Bend-based agency that sits down with you, reviews your actual ANOC and prescriptions, and explains your 2026 options without steering you toward whichever plan pays the highest commission that month.

The consultation costs nothing whether or not you enroll through the agency, and it covers the details that matter most: which plans actually cover your medications under the new $2,100 out-of-pocket cap, whether your providers stay in-network, and how Oregon-specific rules like the Medigap Birthday Rule might apply to your situation. If you’re weighing a Medicare Advantage switch or trying to figure out whether a stand-alone Part D plan makes sense for 2026, book a free Medicare consultation before AEP closes on December 7.

Sources

For a broader look at how AEP compares to general health insurance open enrollment, Pounds Health’s guide to open enrollment breaks down the mechanics side by side.

This article is general information, not a substitute for advice from a qualified financial advisor. Consult a qualified financial professional about your own circumstances before acting on anything here.

FAQ

What Are the AEP Dates for Medicare in 2026?

The Annual Enrollment Period runs October 15 through December 7, 2026. Any change you make in that window takes effect January 1.

What Will Medicare Part D Costs Be in 2026?

Part D plans can charge a deductible of no more than $615, and once your out-of-pocket spending on covered drugs reaches $2,100, covered drugs cost you nothing for the rest of the year.

What’s New for Medicare Beneficiaries in 2026?

The biggest change is the Part D redesign, which sets the $2,100 annual out-of-pocket cap and caps deductibles at $615, effectively eliminating the old coverage gap phase for prescription drugs.

What Are the Income Limits for Medicare Extra Help in 2026?

Extra Help income and resource limits are set annually and adjust for household size; check the current limits directly on Medicare.gov or ask a licensed agent, since figures vary by state and household composition and aren’t part of the AEP-specific changes covered here.

Can Mountaintop Insurance Help Me Enroll During AEP?

Yes. Mountaintop Insurance offers free consultations for Central Oregon residents, reviewing your ANOC, comparing 2026 plan options against your medications and providers, and completing enrollment paperwork directly.

Disclaimer: This article is for general educational purposes only and does not constitute personalized advice. Medicare rules and plan details change frequently.

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