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AEP, Explained Without the Sales Pitch: A Straight Guide to Medicare's Annual Enrollment Period

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Every fall, mailboxes fill with glossy brochures promising lower premiums and extra benefits, and roughly 68 million Medicare beneficiaries have to sort the real information from the marketing. The Annual Enrollment Period is a seven-week window that decides what your health coverage looks like on January 1. This guide walks through what the window actually allows, what it does not, and how to run the numbers for your own household before the December 7 deadline.

What the Annual Enrollment Period Actually Lets You Change

The Annual Enrollment Period runs from October 15 through December 7, and any election you make inside that window takes effect January 1. Those two dates carry more weight than any commercial you will see this fall. Inside AEP you can move from Original Medicare into a Medicare Advantage plan, move from one Advantage plan to another, drop Advantage and return to Original Medicare, or join, switch, or leave a standalone Part D drug plan.

What you cannot do matters just as much. AEP does not reopen Medigap guaranteed issue in most states, so trading an Advantage plan for a Medicare Supplement can mean answering health questions and risking a denial. AEP does not let you enroll in Medicare for the first time if you are not yet eligible, and it does not let you drop Part B. If you already carry a Medicare Supplement, the window offers you nothing except a Part D review, because supplement plans are not sold through the annual election.

One timing detail helps. Medicare's Plan Finder at Medicare.gov usually refreshes with next year's plan data on October 1, two weeks before the window opens. Save a screenshot of your current plan's 2026 details before that refresh so you can compare cleanly against whatever replaces it.

Four Enrollment Windows That Surround AEP

Four other windows sit around AEP, and confusing them causes most of the expensive mistakes. Your Initial Enrollment Period starts three months before the month you turn 65, includes your birthday month, and runs three months past it. Someone born in March gets January 1 through July 31 to sign up for Part A and Part B. Enrolling in the final three months of that window delays your Part B start date and can leave a coverage gap.

The Medicare Advantage Open Enrollment Period runs January 1 through March 31 and belongs only to people already enrolled in an Advantage plan. It permits one change: swap to a different Advantage plan, or leave Advantage for Original Medicare and add a standalone drug plan. You cannot use it to move from Original Medicare into Advantage, which surprises a lot of people who call in February.

The General Enrollment Period, also January 1 through March 31, catches people who missed their Initial Enrollment Period. Signing up there can trigger a Part B late penalty of 10% for every full 12 months without coverage, and that surcharge stays on your premium for as long as you have Part B. Special Enrollment Periods cover job-based coverage, a permanent move, dual eligibility for Medicaid, and the five-star rule, which lets you switch into a Medicare Advantage plan rated five stars at any point in the year.

Your ANOC Is a Legal Notice, Not Junk Mail

Insurers must mail the Annual Notice of Change by September 30 to every member of a Medicare Advantage or Part D plan, and it describes exactly what shifts on January 1. The document lists premium changes, deductible changes, copay changes by tier, drugs removed from the formulary, drugs moved to a higher tier, and any change to the pharmacy network. Reading it takes fifteen minutes and prevents most January surprises.

A typical example: a member's Part D plan kept its $42 premium but moved a thyroid medication from tier 2 to tier 3, raising the copay from $12 to $47 a month, and dropped one brand inhaler from the formulary entirely. Nothing in the marketing mailer mentioned either change. The ANOC did, on page four.

The companion document, the Evidence of Coverage, runs 60 to 100 pages and holds the fine print on prior authorization, referral rules, and out-of-network costs. You do not need to read all of it. Look for the sections on prior authorization and the drug formulary, since those two drive most denials and most surprise bills. If your ANOC shows no changes at all, you still want to confirm the plan's star rating, because a drop to two and a half stars over consecutive years can lead CMS to terminate the contract.

The Math of Part D in 2026

The Inflation Reduction Act reshaped drug coverage, and the 2026 numbers are worth memorizing. The out-of-pocket cap on Part D drugs is $2,100 for the year, up from $2,000 in 2025, and once you hit it your covered drug spending drops to $0 for the rest of the calendar year. The maximum deductible a plan may charge is $615. Covered insulin costs no more than $35 per month per prescription, and ACIP-recommended vaccines cost nothing.

Negotiated prices for the first ten selected drugs took effect January 1, 2026, and they show up in plan formularies. Eliquis is priced at $231 for a 30-day supply, Xarelto at $197, Jardiance at $197, Januvia at $113, and Entresto at $295. Those figures are the maximum fair price, so your actual copay depends on where the drug lands in the plan's tiers and whether you are still working through a deductible.

The comparison mistake people make is shopping on premium alone. A plan with a $0 premium and a $615 deductible can cost more than a $55-a-month plan with a $0 deductible if you fill four brand drugs. Add up twelve months of premiums, the deductible, and the copays for your actual drug list at your actual pharmacy, then check the total against the $2,100 ceiling. If your calculated total lands near the cap, plan design matters much less than the premium.

Medicare Advantage Versus Medigap: The Switch You May Not Be Able to Undo

Moving from Original Medicare with a supplement into a Medicare Advantage plan is easy. Moving back is where people get trapped. Federal law guarantees you the right to buy a Medigap policy without health underwriting only during your six-month Medigap open enrollment, which starts the month you are 65 or older and enrolled in Part B. There is also a 12-month trial right if you join Advantage when you first become eligible for Medicare and then leave within the year.

Outside those protections, insurers in 46 states and the District of Columbia can ask about your health and decline you. A 71-year-old with well-controlled diabetes and a prior stent placement can be turned down for Plan G in Ohio and accepted in New York, where guaranteed issue applies year-round. Connecticut, Massachusetts, and Maine also require insurers to sell Medigap regardless of medical history, and several states offer a birthday rule that gives you a short annual window to change supplement plans without underwriting.

The price gap is real. A 67-year-old woman in good health might pay $150 to $220 a month for Plan G depending on ZIP code, while a $0-premium Advantage plan in the same county may cap in-network out-of-pocket spending at $9,250 for 2026. Advantage plans also come with networks and prior authorization. Compare the worst-case year, not the best one: premiums plus the out-of-pocket maximum on one side, premiums plus the Part B deductible of $283 on the other.

IRMAA: The Surcharge That Follows Your Old Tax Return

Medicare's income-related monthly adjustment amount is the most overlooked cost in the enrollment decision. IRMAA is based on your modified adjusted gross income from two years earlier, so your 2026 premium reflects your 2024 tax return. The 2026 thresholds begin at $109,000 for a single filer and $218,000 for married couples filing jointly, and married filing separately crosses the first threshold at $109,000.

The standard Part B premium for 2026 is $202.90 a month. In the second bracket, which covers single filers earning $137,000 to $171,000, the Part B premium roughly doubles, adding about $2,400 a year on top of standard costs. Part D carries its own surcharge that runs alongside, from about $14 to roughly $90 a month depending on the bracket. The highest brackets add several hundred dollars a month across both programs.

If your income dropped because of a life-changing event, you can appeal. Retirement, the death of a spouse, marriage, divorce, or the loss of income-producing property all qualify for a new initial determination using Form SSA-44, filed with Social Security along with proof of the event. A one-time Roth conversion or the sale of a rental property raises your MAGI for two years without qualifying, so talk to a tax professional before December 31 if a large conversion could push you over a threshold.

The Five Mistakes That Cost People the Most

First, missing December 7. There is no grace period, and a plan change made on December 8 will not happen. Second, assuming a $0 premium means free health care. Advantage plans advertise $0 premiums and then charge $45 for a specialist visit, $350 a day for the first five days of a hospital stay, and 20% for outpatient surgery until you reach the out-of-pocket maximum.

Third, skipping the doctor and pharmacy check. Provider networks change every January, and a plan directory is not always accurate. Call the office and ask two questions: are you in network for this specific plan, and are you accepting new patients on it. Fourth, ignoring the drug list. A plan that covered your inhaler in 2025 may have dropped it, and a formulary exception takes time your refill may not allow.

Fifth, letting a plan auto-renew without a review. Auto-renewal is the default, and it is how roughly 70% of beneficiaries end up in a plan they would not choose again. The other quiet error is skipping Part D altogether because you take no medications. The late enrollment penalty is 1% of the national base beneficiary premium for every full month without creditable drug coverage, and it never goes away. The 2025 base beneficiary premium was $36.78, so twelve months without coverage adds roughly $4.41 a month permanently, and that number grows with each year of delay.

How to Check Your Own Situation in Under an Hour

Start with a written drug list. Include the name, the dose, and the number of fills per month, because a plan priced on a 30-day supply behaves differently when you use 90-day mail order. Then log in to Medicare.gov, enter your ZIP code, and run the Plan Finder with all of your drugs and your preferred pharmacy. Run it three times with three different pharmacies, since preferred cost-sharing networks can swing annual drug costs by several hundred dollars.

Next, total your fixed costs. Multiply the monthly premium by twelve, add the deductible, and add the copays for a typical year. Then total the same figures for a bad year, when you might hit the hospital or the $2,100 drug cap. The plan that wins on the typical year often loses on the bad year, and the bad year is what insurance is for.

Finally, check two eligibility items. Ask whether your income puts you near the Extra Help limits, which have covered people at roughly 150% of the federal poverty level, because that assistance lowers drug costs and eliminates late penalties. And check the plan's star rating on Medicare.gov. A five-star rating gives you a Special Enrollment Period to switch into that plan at any point in the year, which is a flexibility worth paying a little premium for. Write your three finalists on one page with the annual totals beside them.

Three Households, Three Different Answers

Household A is a 68-year-old woman with diabetes on four generic drugs. She has Original Medicare, Plan G at $185 a month, and a Part D plan at $38 a month. Her fixed annual cost is $2,434.80 for Part B, $2,220 for Plan G, and $456 for Part D, plus the $283 Part B deductible, for a total near $5,394 before drug copays. An Advantage plan with a $0 premium would save her roughly $2,676 a year if she stays healthy, and cost her up to $9,250 in a bad year instead of $283.

Household B is a 72-year-old man in an Advantage plan whose cardiologist is leaving the network on January 1. He has two options: a different Advantage plan that includes the cardiologist, or Original Medicare plus Plan G. At 72 with a prior cardiac procedure, underwriting in his state will likely block Plan G, so his real choice is which Advantage plan, and he should confirm the cardiologist's network status in writing before December 7.

Household C is a 66-year-old single woman with 2024 income of $150,000. She sits in the second IRMAA bracket, so her Part B premium is about $405 a month instead of $202.90, adding roughly $2,400 a year, plus about $35 a month in Part D IRMAA. If she retired in 2025, Form SSA-44 could recover most of that. Her plan review should run on total cost, not premium, because the surcharge dwarfs any difference between competing plans.

Your Next Steps Before December 7

Give yourself a three-week runway. In the first week, gather your ANOC, your Evidence of Coverage, your drug list, and your pharmacy address, then run the Plan Finder. In the second week, call the two or three doctors you actually see and confirm network status for each plan on your shortlist. In the third week, make the election on Medicare.gov or by calling 1-800-MEDICARE, and save the confirmation number in a place you will find in February.

If you are on Original Medicare with a supplement, your work is smaller: review Part D, confirm the premium and formulary, and leave the supplement alone unless you have moved to a new state. If you are in an Advantage plan that is leaving your county or terminating its contract, you have a special election period that begins before AEP and gives you additional options, including a guaranteed issue right for Medigap in some termination cases.

Write down the January 1 effective date and the first premium due date for any new plan. January is when most billing problems appear, and a call in the first week of the month resolves them faster than a call in March. Keep your old plan's ID card until the new one arrives and confirm the new card shows the correct plan name, the correct drug coverage, and the correct effective date.

The decisions inside this window are reversible for most people during the January 1 through March 31 Medicare Advantage Open Enrollment Period, but not all of them, and the Medigap decision usually is not. That asymmetry is the reason to spend an hour with the numbers now rather than an hour on the phone in February trying to undo a choice. A licensed agent can pull your plan's actual formulary, verify network status for your specific doctors, and run the total-cost comparison with you line by line at no cost to you. Call one before December 7 with your drug list and your ANOC in hand, and ask them to show you the bad-year number, not just the premium.

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Published 2026-11-14 12:21:15.359266+00:00