What the fall window is for
Between October 15 and December 7, 2026, people already on Medicare can change how their Medicare is delivered for the coming year. That is the whole function of the window. Changes made inside it take effect with the new plan year rather than immediately, and the confirmation notice you receive is where the effective date is stated.
The season closes on December 7. That date sits before the state marketplace deadline of December 15 and well before the marketplace closing date of January 31, which is exactly why the two get confused every autumn in households where one person is on Medicare and another is not.
If you are happy with your plan, and you have checked next year’s costs, network and drug list against it, the correct action in this window is nothing. That is a legitimate outcome. It is only a bad outcome when “nothing” means “did not look.”
Two seasons in one autumn, kept apart
| Program | Window | What it changes |
|---|---|---|
| Medicare annual enrollment | Oct 15 to Dec 7, 2026 | Your Medicare Advantage plan, your drug plan, and whether you use Original Medicare or an Advantage plan |
| NY State of Health marketplace | Nov 1, 2026 to Jan 31, 2027 | Marketplace plans for people not on Medicare. Dec 15 for a January 1 start |
| Medicaid, Essential Plan, Child Health Plus | Year-round | Nothing seasonal. Applications accepted any month |
The practical consequence in a mixed household: two calendars, two applications, two sets of paperwork, and no overlap between the people who administer them. A marketplace navigator is not the right person for a Medicare Advantage question, and the reverse is equally true. The full enrollment calendar keeps the dates in one place.
The four parts, in the order they matter to a decision
Medicare is built in parts, and the parts are the vocabulary every phone call will use.
Part A is hospital insurance: inpatient hospital care and related institutional services.
Part B is medical insurance: doctor visits, outpatient care, and the services that happen outside an admission.
Part C, usually called Medicare Advantage, is the alternative delivery route. A private plan provides your Part A and Part B benefits, generally through a defined network, and often bundles drug coverage with them.
Part D is prescription drug coverage, sold as a standalone plan or built into an Advantage plan.
The decision most people are actually making in the fall is between two structures: Original Medicare with a separate drug plan, or a Medicare Advantage plan that bundles. Networks, referral rules and drug lists differ between them, and that difference is what shows up in your life. We do not publish premium figures or cost-sharing amounts for any of these, because those numbers change annually per plan, and a stale figure in an article is worse than no figure.
What the window changes, and what it does not touch
| You want to | Is the fall window the right tool? |
|---|---|
| Switch from one Medicare Advantage plan to another | Yes |
| Move from Original Medicare to Medicare Advantage, or back | Yes |
| Join, drop or switch a Part D drug plan | Yes |
| Sign up for Medicare for the very first time | No. First enrollment runs on your own dates, not the fall calendar |
| Buy or change a Medicare supplement policy | No. Supplement rules turn on when an insurer must sell to you, which is a separate question |
| Apply for Medicaid alongside Medicare | No. That application is year-round, through the local department of social services if you are 65 or older |
The two “no” rows are where people lose money. First-time enrollment timing depends on your birthday and on whether you or a spouse are still working with employer coverage, so we deliberately print no dates for it here. Get those dates from Medicare directly and write them down, because missing them has lasting cost consequences that a later phone call cannot undo.
The envelope that decides whether you should do anything
Every fall, your plan sends a notice of what changes next year. It is the least interesting piece of mail you will receive all season and the only one that matters. Open it with three questions in hand.
Did my costs change? Premiums and cost sharing are set annually by each plan.
Did my doctors stay in network? Practices join and leave plans between years, and no one sends a separate letter about your specific doctor. Call the practice, give the exact plan name, and ask whether they participate for the coming year.
Did my prescriptions move? Drug lists are rewritten annually. A medication can shift to a tier that costs several times what it did, or leave the list entirely. Read the formulary with your actual medication names and doses in front of you.
Sentence for the plan’s member services line: “I’m reviewing my plan for next year. Please confirm whether my prescriptions are still covered at the same tier, and whether my primary care doctor is still in network for the 2027 plan year.”
Dual eligible: Medicare plus Medicaid
Some people qualify for both programs. Medicare comes with age 65 or with disability. Medicaid is income based, and it is the program that covers long-term care, which Medicare does not.
Holding both is not a paperwork error, and it is worth pursuing if your income is low. It comes with additional help, and the correct move is to ask what specifically applies to you rather than to assume.
Two procedural facts that save wasted calls. For people 65 and older, and for applications based on disability, Medicaid runs through the local department of social services, not through NY State of Health, and it applies asset tests that the working-age categories do not. And Medicaid takes applications year-round, so the December 7 Medicare deadline has nothing to do with it.
Opening line that routes the call correctly: “I have Medicare and I want to apply for Medicaid. I’m over 65, so should this go through the local department of social services?”
How Medicaid works in New York, including the renewal problem that causes most coverage losses.
Where to get help without buying anything
Two kinds of help exist in this season, and they are not the same.
Free counseling that sells nothing. Certified counselors and community organizations in New York help people compare Medicare options without a financial stake in the outcome. Certified navigators at NY State of Health, 1-855-355-5777, are free and commission-free, though their remit is the state marketplace and the year-round programs rather than Medicare plan selection.
Sales contacts. Mailers that look official, television advertisements with a phone number, and unsolicited calls are marketing. Some of the people behind them are competent brokers. All of them are paid when you enroll.
You are allowed to ask, and asking is not rude: “Before we go further, are you an insurance agent or a counselor? Are you paid a commission if I enroll in a plan through you?”
What this page will not tell you
Three deliberate gaps, and the reason for each.
No premium or deductible figures. They are set per plan, per year. Anything printed here in August would be wrong by January, and a wrong number sends people into the wrong plan.
No plan rankings or “best plan” lists. The best plan is the one your doctors take and your prescriptions sit on, and that answer is different for every household on your floor.
No first-enrollment dates. They depend on your birthday and your working situation, and getting them from a general article rather than from your own record is how people acquire permanent cost consequences.
What this page can do is tell you which season you are in, which questions produce real answers, and which envelope to open.
Questions people ask
I turn 65 next spring. Is this fall window mine?
No. First-time enrollment runs on dates tied to your own eligibility, not the October to December window, which is for changing coverage you already have. Get your specific dates from Medicare and note them, especially if you or your spouse are still working with employer coverage.
I have Medicare. Do I need to do anything on NY State of Health?
Not for your Medicare. The marketplace season is a separate program on a separate calendar. The exception is Medicaid: if your income is low, dual eligibility is worth pursuing, and for people 65 and older that application goes through the local department of social services.
What happens if I do nothing before December 7?
Your current plan continues into the new year with next year’s terms. That is fine if you checked those terms and acceptable to you. It is expensive if your drug list changed and you find out at the pharmacy in January.
Can I keep my doctor if I switch plans?
Only if that doctor participates in the plan you are moving to. Call the practice, give the exact plan name and the carrier, and ask about the coming plan year specifically. A carrier can offer several plans with different networks.
I lost employer coverage at 66. What now?
That is a coverage loss, and it has its own timing rules that are separate from the fall season. Do not wait for October. What to do in the first week after losing coverage covers the sequence, and the Medicare-specific timing question goes to Medicare directly.
Sources
- Medicare.gov — when coverage starts (checked 2026-08-12)
- NY State of Health (checked 2026-08-12)
- New York State Department of Health — Medicaid (checked 2026-08-12)
More in Coverage
- Child Health Plus: Coverage for Kids in New York — Child Health Plus covers children under 19 in New York regardless of immigration status, with family income limits far above the adult ones. How to apply.
- You Just Lost Coverage: The First Week — Job loss, turning 26, a move, a divorce — each opens a 60-day window. What to do in the first days, and which New York programs ignore the calendar entirely.
- Which Health Program Are You Likely Eligible For in New York? — Answer five questions and see which New York health coverage programs are open to you — Medicaid, the Essential Plan, Child Health Plus, NYC Care, marketplace plans. Runs in your browser.
This page explains how the system works. It is not medical advice. More.