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Medicare's 2026 Enrollment Window Closes December 7 — The Money Decisions Hiding In Plain Sight

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Today is November 12, 2026. Twenty-five days remain in Medicare's Annual Enrollment Period, which opened on October 15 and shuts at midnight on December 7. Everything you elect in that window takes effect January 1, 2027, and stays in place for a full calendar year. For most households on Medicare, the choices made in these three weeks move more money than any other financial decision they will make all year — often more than a year of property taxes, and sometimes more than a year of portfolio income. The premiums, deductibles, formularies and provider networks for 2027 are already published and sitting in the Annual Notice of Change booklet that landed in mailboxes in September. What follows is a plain walk through the numbers, the deadlines and the traps, so the decision you make before December 7 is one you can defend with arithmetic rather than hope.

1. Twenty-Five Days Left in the 2026 Annual Enrollment Period

Medicare's Annual Enrollment Period for 2026 opened October 15 and closes at midnight on December 7, 2026. As of today, November 12, that leaves 25 days. Any election you make in that window applies to coverage beginning January 1, 2027, and locks in for the whole year.

The 2026 plan year you are living in now was set last December. What you are choosing today is your 2027 coverage, which means the premium and copay figures you should be comparing are the ones printed in the 2027 plan materials, not the amounts you have been paying since January.

Doing nothing is an option, and it is where a great deal of money leaks away. If your plan is still offered and you take no action, you stay enrolled on its new terms. Insurers refile premiums, copays, drug tiers and physician networks every single year. A plan that cost you $1,900 out of pocket in 2026 can cost $3,400 in 2027 with the identical name on the card, because a preferred pharmacy left the network and one of your drugs moved up two tiers.

Two other windows matter for planning. The Medicare Advantage Open Enrollment Period runs January 1 through March 31, 2027, and allows one change for people already in an Advantage plan: move to a different Advantage plan or return to Original Medicare with a stand-alone drug plan. It does not reopen Medigap guaranteed issue in most states. Separately, if you turn 65 in the months ahead, your Initial Enrollment Period is a seven-month window that starts three months before your birthday month and ends three months after it.

2. Part B: The 20% With No Ceiling

Part B is the medical half of Original Medicare, and its cost structure is simple in a way that catches people badly. After you meet the annual deductible, Medicare pays 80% of the approved amount for covered services and you pay the other 20%. There is no out-of-pocket maximum in Original Medicare. None.

Run the arithmetic on realistic numbers. If you have $8,000 in Part B covered charges after the deductible in 2026, your 20% is $1,600. At $60,000 in approved charges, your share is $12,000. A hip replacement with rehab, a cancer course, or a cardiac event followed by a long recovery can push approved charges past $150,000, and 20% of that is $30,000 coming out of your own account.

The premium comes out of your Social Security check automatically once you are collecting benefits, which is why some people never notice it rising. Confirm the exact 2026 Part B premium and deductible on your Medicare Summary Notice or your Social Security statement rather than relying on a figure you remember from a prior year, because both are reset annually by the Centers for Medicare & Medicaid Services.

Two structural points are worth holding onto. First, the 20% applies to Medicare-approved amounts, so a provider who does not accept assignment can bill you above that approved amount, up to a limit, and that extra is entirely yours. Second, the 20% is the reason Medigap and Medicare Advantage exist. Everything in the rest of this article is, in one way or another, a hedge against that uncapped number.

3. IRMAA: The Surcharge Tied to a Tax Return You Filed Two Years Ago

Medicare's income-related monthly adjustment amount is a surcharge stacked on top of your Part B and Part D premiums when your modified adjusted gross income crosses certain thresholds. The tier structure has five steps above the base level, and the cutoffs are indexed each year. Confirm the exact 2026 dollar figures with Social Security before you plan around them, because a few thousand dollars of income can move you a full tier.

The timing is what surprises people. Social Security uses the tax return from two years earlier. Your 2026 premiums were calculated from your 2024 return. If you sold a rental property in 2024 and booked a $90,000 gain, that decision is still raising your Medicare premium in 2026, long after the money has been spent on something else.

The surcharge grows quickly at the top. At the highest tiers, a married couple filing jointly pays thousands of dollars more each year across Part B and Part D than a couple at the base premium, and the surcharge applies whether you are in Original Medicare or a Medicare Advantage plan. Advantage enrollees sometimes assume they are exempt. They are not.

You have one real remedy: Form SSA-44. If your income fell because of a life-changing event — work stoppage or reduction, retirement, marriage, divorce, death of a spouse, or loss of income-producing property — you can ask Social Security to use your current income instead of the two-year-old return. File it with documentation and keep a copy. Retirees who stop working at 66 and see an IRMAA notice at 68 based on their final working year are the classic successful appeal.

4. Part D and the Annual Out-of-Pocket Cap

Part D is where the smallest monthly premium can conceal the largest annual bill. The restructured benefit created by the Inflation Reduction Act includes an annual cap on what you pay out of pocket for covered drugs, a $35 monthly cap on covered insulin, and $0 cost sharing for recommended adult vaccines. The cap was set at $2,000 when it took effect in 2025 and is indexed from there, so confirm the 2026 figure on Medicare.gov or with the plan before you budget around it.

The mechanics decide the real cost. Every plan publishes a formulary that sorts drugs into tiers, plus a pharmacy network that prices preferred and standard pharmacies differently. Two plans can charge $0 and $47 a month and reverse their ranking once your actual prescriptions are entered.

Worked example. Suppose you take two generics and one brand drug that lists at $600 a month. Plan A has a $0 premium and places the brand on tier 4 with 40% coinsurance, which is $240 a month, or $2,880 a year, plus small generic copays. Plan B costs $38 a month and puts the same drug on tier 3 for a $47 copay: $564 in copays plus $456 in premiums, or $1,020 a year. Same drug, same body, $1,860 difference.

The annual cap protects the worst case, but it does not equalize plans, because premiums sit outside the cap and because reaching the cap at all depends on which tiers your drugs land in. Check the 2027 formulary for each drug by name and dose, and confirm that your pharmacy is in the preferred network before you enroll.

5. Medigap: The Six-Month Window That Prices Your Whole Retirement

Medigap policies are sold by private insurers and labeled by letter. Plans C and F are closed to anyone who became eligible for Medicare on or after January 1, 2020, which is why Plan G has become the common choice: it pays the Part A deductible, the Part B coinsurance and hospital costs beyond Medicare's limits, leaving you responsible only for the Part B deductible. Plan N trades a lower premium for small copays on office visits and emergency care.

The six-month Medigap open enrollment window is the single most valuable deadline in Medicare. It begins the month you are 65 or older and enrolled in Part B and runs six months. During that window an insurer cannot refuse you, charge you more, or impose a waiting period because of your health history. Miss it and most states permit medical underwriting. A diagnosis of heart disease, diabetes with complications or a prior cancer can mean a denial or a premium 50% higher than the advertised rate.

Pricing method matters as much as the letter. Community-rated policies charge everyone the same rate regardless of age. Issue-age-rated policies set the price by your age at purchase. Attained-age-rated policies rise as you age, and those increases compound. A $150 monthly premium at 65 growing 2.5% a year reaches roughly $217 by 80; at 6% a year it reaches about $359, and the gap widens every year after.

One more rule worth knowing: a Medicare Advantage plan cannot be paired with Medigap, and dropping Advantage to buy Medigap later usually requires underwriting.

6. Medicare Advantage: Lower Premium, Higher Ceiling

Medicare Advantage plans are paid a fixed amount per member per month by the federal government and administer your Part A and Part B benefits under a network contract. Premiums are frequently $0, which is accurate and also incomplete: your Part B premium still comes out of your Social Security check, and that is the floor of what you pay no matter which plan you pick.

What you trade for the low premium is network control and prior authorization. Advantage plans use provider networks, and a specialist you have seen for a decade may sit outside the 2027 network. Many plans also require prior authorization for imaging, procedures and post-acute care, and the approval process can delay care by days.

The number that decides whether an Advantage plan is a good deal is the annual out-of-pocket maximum. Every plan must cap in-network spending, and some set their limit well below the statutory ceiling. Find the 2027 in-network maximum in the plan's Summary of Benefits and compare it against your Medigap alternative. A Medigap Plan G at $180 a month costs $2,160 a year in premium and leaves you with a Part B deductible and no 20% exposure. A $0-premium Advantage plan with a $6,900 in-network cap costs nothing in premium and up to $6,900 if you have a bad year.

Neither answer is universally right. Healthy members who stay in network often come out ahead with Advantage. Members with complex conditions or broad specialist needs often come out ahead with Original Medicare plus Medigap.

7. The Late-Enrollment Penalties That Never Expire

Part B carries a penalty of 10% for each full 12-month period you were eligible but not enrolled, and that percentage is added to your premium for as long as you have Part B. Twenty-six months late means two periods, so a 20% surcharge. On a premium in the range of $185 to $200 a month, that is roughly $37 to $40 extra every month, or more than $450 a year, for the rest of your life.

Part D carries its own penalty: 1% of the national base beneficiary premium for each full month you went without creditable drug coverage, rounded to the nearest ten cents. Fourteen months without coverage adds 14% of the base premium, permanently. The base premium changes each year, so the dollar amount drifts, but the percentage does not go away.

Part A is free for most people because they or a spouse accumulated 40 quarters of Medicare-taxed work. If you fall short, you pay a monthly premium, and there is a 10% late-enrollment penalty on that premium for twice the number of years you were late.

The trap that catches retiring workers is the eight-month Special Enrollment Period that follows the end of employer group coverage. It is generous but narrow. COBRA does not count as employer coverage for this purpose, so relying on COBRA for 18 months and then signing up for Part B can produce a gap. Retiree coverage from a former employer is usually secondary to Medicare, which means it may not delay Part B at all. Ask your benefits office for the creditable coverage notice in writing.

8. The Mistakes That Cost the Most

The costliest error is choosing on premium alone. A $0 premium plan with a narrow formulary and a high drug deductible can cost a household taking four medications $2,000 more per year than a plan charging $45 a month. Premiums are the visible number; drug tiers and the out-of-pocket maximum are the ones that decide the year.

The second mistake is assuming physicians stay in network. Networks are refiled annually, and a specialist group can leave a plan effective January 1. Call the office and ask which plans they will accept in 2027 rather than trusting the directory, which is frequently out of date.

Third, people skip the Annual Notice of Change. That booklet states in plain type what changed: the premium, the deductible, drugs leaving the formulary, and pharmacies leaving the network. Read the page that lists your drugs. If you find a change that matters, you still have until December 7 to act.

Fourth, IRMAA notices go unchallenged. Anyone who retired in the past two years and received a surcharge based on working-year income likely qualifies for relief through Form SSA-44, and many never file it.

Fifth, some enrollees accept a plan without a documented Scope of Appointment or a written summary, then discover the drug they needed was never covered. Ask for the plan name, the premium and the drug list in writing before anything is submitted.

9. How to Check Your Own Situation Before December 7

Start with the tax return you filed for 2024, since that is the return behind your 2026 IRMAA calculation. Find your adjusted gross income on the first page and add any tax-exempt interest. If that total sits near a tier boundary, look up the 2026 thresholds on the Social Security website. If your income dropped because of retirement or another qualifying event, note the date and the documentation you would attach to Form SSA-44.

Next, write out every prescription by name, dose and frequency, including the ones you take occasionally. Then list every physician, clinic, lab and hospital you used in 2026, plus the two you are most likely to need in 2027. That second list is shorter than people expect and more predictive than a broad directory search.

Then build one number per plan: twelve monthly premiums, plus the deductible, plus expected drug copays, plus a reasonable allowance for office visits and any planned procedures. Compare the totals side by side. If you are considering an Advantage plan, also note its in-network out-of-pocket maximum, because that is your worst case for the year. If you are considering Original Medicare with Medigap, note that your worst case is the Medigap premium plus the Part B deductible.

Finally, confirm three things in writing from each plan you are seriously weighing: that your drugs are on the 2027 formulary, that your preferred pharmacy is in network, and that your physicians are contracted. Those three answers settle most of the decision.

10. What to Bring to the Conversation, and What to Ask

Whether you call a licensed agent or 1-800-MEDICARE, the quality of the answer depends on what you bring. Have your red, white and blue Medicare card, your 2024 tax return, and your written prescription list in front of you. Add the Annual Notice of Change from your current plan, because the agent can read the changes with you instead of guessing at them.

Ask five questions in this order. What is the total annual cost of this plan for my specific drug list, not the average member? Is each of my physicians contracted for 2027, and is my pharmacy in the preferred network? What is the out-of-pocket maximum, in network and out? What happens to my costs if I need a specialist, an MRI or a short hospital stay? And what am I giving up if I leave my current plan?

Listen for specifics. An answer of "you'll be fine" without numbers is not an answer. A credible comparison names the premium, the deductible, the drug tiers, the maximum, and the doctors. Get the recommendation in writing before anyone submits an enrollment, and confirm the effective date of January 1, 2027.

One caution about timing. The final week before December 7, 2026 is the busiest of the year for carrier call centers and for 1-800-MEDICARE, with hold times that routinely run past 45 minutes. A decision made in haste on December 6 costs the same as one made calmly on November 13, except that the rushed one is more likely to contain a wrong drug or a missing doctor.

Twenty-five days is enough time to do this properly. It is not enough time to do it twice.

If you would rather work through this with someone who does it daily, call a licensed Medicare agent this week. There is no charge for the conversation, no obligation to change plans, and a good agent will build the total annual cost comparison in writing so you can see the arithmetic for yourself. Have your Medicare card, your 2024 tax return and your prescription list ready, ask for the numbers behind every recommendation, and get the answer in writing before December 7, 2026 closes the window.

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Published 2026-11-12 12:16:51.101189+00:00