Mark two dates now: October 15 and December 7. That is Medicare’s annual open enrollment window, the one stretch of the year when almost everyone on Medicare can rework their coverage for the following January. It is still more than three months away, which is exactly why late June is a good time to think about it. The people who get burned each fall are usually the ones who started looking at their options the week before the deadline.
Here is what the window ahead actually lets you do, what it does not, and what you can do over the summer so that October is easy.
What the October 15 to December 7 window allows
During fall open enrollment, according to Medicare’s official enrollment-period rules, you can make any of these moves, and the change takes effect January 1:
Switch from Original Medicare to a Medicare Advantage plan, or from Medicare Advantage back to Original Medicare. Move from one Medicare Advantage plan to another. Join a stand-alone Part D prescription drug plan, switch from one drug plan to another, or drop drug coverage entirely. You can make more than one change during the window; the last choice you make by December 7 is the one that counts.
If you do nothing, your current plan generally rolls over into next year. That sounds convenient, but it is precisely how people end up in plans whose premiums, drug lists, and provider networks have quietly shifted underneath them.
What the fall window does not cover
Two common misunderstandings are worth clearing up early. First, fall open enrollment is not for signing up for Medicare itself. If you are turning 65, you have your own seven-month initial enrollment period around your birthday, and people who kept working past 65 with employer coverage get a special enrollment period when that coverage ends.
Second, Medigap supplement policies play by different rules. Your one-time guaranteed-issue window for Medigap is generally the six months after you first enroll in Part B. Outside that window, an insurer in most states can review your health history and charge more or decline coverage. So a fall switch from Medicare Advantage back to Original Medicare deserves extra homework: leaving is easy, but getting a supplement to go with it may not be.
There is also a second, narrower window later on. From January 1 through March 31, people already in a Medicare Advantage plan can make a single switch to another Advantage plan or drop back to Original Medicare. It is a useful safety valve, but it is only for those already in Advantage plans.
The mail that matters in September
Every fall, your current plan must send you an Annual Notice of Change, which typically arrives in September. It lists, side by side, what your plan charges and covers this year versus what it will charge and cover next year. It is the single most useful document in this process and the most commonly discarded. When it arrives, read three things: the premium, the drug formulary changes, and the provider network changes. Any one of them can turn a plan that worked this year into a bad fit next year.
The updated Medicare & You handbook also lands in the fall, and plan details for the coming year become searchable on Medicare’s plan-finder in October. Costs and plan menus for 2027 have not been announced yet; those come from CMS and the insurers in the fall, which is another reason the window starts October 15 and not sooner.
The numbers you are comparing against
To judge whether a plan pitch is a good deal, it helps to know the current baseline. In 2026, the standard Part B premium is $202.90 a month with a $283 annual deductible, per the CMS fact sheet on this year’s premiums and deductibles; higher earners pay income-adjusted amounts above that. On the drug side, Part D now carries a hard annual cap on out-of-pocket costs, set at $2,100 for 2026. Once your covered drug spending hits the cap, the plan pays the rest of the year. There is also an option to spread drug costs across monthly payments rather than paying at the pharmacy counter all at once.
These figures will be updated for 2027 in the fall announcements. What matters for now is understanding the structure so that when the new numbers arrive, you know where to look.
A summer checklist that makes October easy
You cannot make changes yet, but you can do the prep work that takes the panic out of the deadline. Write down every prescription you take, with dosages, because drug-plan comparisons live or die on your actual medication list. Note which doctors and hospitals you are unwilling to give up. Pull your claims from this year and tally what you actually spent out of pocket, since that number, not the premium alone, is what you are trying to beat. And create or check your account at Medicare’s plan-compare tool so you are not fighting with passwords in October.
Free help exists, and it is not a sales call
Every state runs a State Health Insurance Assistance Program, or SHIP, offering free one-on-one counseling from trained volunteers who do not earn commissions. You can find your state program through shiphelp.org. That matters because the fall also brings a flood of TV ads and phone pitches, some of them from marketers with a strong financial interest in moving you to a particular plan. A good rule for the season ahead: no legitimate counselor will cold-call you, and no decision needs to be made on the phone the day someone calls.
The window is October 15 to December 7. The homework season starts now.
This article was produced with AI assistance and reviewed by a human editor. Figures are linked to their primary sources; where a claim could not be verified from the public record, we say so.
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