Every fall, Medicare plans quietly rewrite themselves. Premiums move, drug lists get reshuffled, copays shift, and doctor networks change. The Medicare plan changes for 2027 are coming, and by law your plan must spell out every single one of them in a letter that reaches your mailbox by September 30.

That letter is called the Annual Notice of Change, or ANOC. It looks like junk mail. It is anything but. Here is how to put it to work in about fifteen minutes.

Whether you have a Medicare Advantage plan, a drug plan, or a Medigap policy, the next few weeks set up the decisions of the fall. A little preparation now makes each one easier.

How you will learn about Medicare plan changes for 2027

If you have a Medicare Advantage plan or a stand-alone Part D drug plan, the ANOC lists exactly what will be different next year: the premium, the deductible, the drug list, the pharmacy network, the provider network, and any extra benefits. The September 30 delivery date is no accident. It gives you time to compare your options before the fall enrollment window opens.

Think of it as your plan's report card for next year — written by the plan itself, and mailed before you have to decide anything.

Three dates worth writing down

September 30 is the ANOC deadline. October 15 through December 7 is Medicare's Annual Enrollment Period, when you can switch plans. January 1, 2027 is when any change — including the ones your current plan is making — takes effect. If you like your plan after reading the letter, you do not need to do anything at all. But that choice should be made with the letter open, not sitting in a drawer.

If the window slips by, all is not lost. People already in a Medicare Advantage plan get a separate switching window early in the new year, and special enrollment periods cover moves and certain life events. Still, fall is the clean shot, with every option on the table.

Five quick checks, one cup of coffee

When the envelope arrives, set aside one unhurried sitting and look for five things. Most people finish the whole review before the coffee goes cold.

Even if your plan looks unchanged, a short comparison can pay off. Plans compete every year, and an option in your area may have improved while yours stood still. People on Original Medicare with a drug plan should give that plan the same fifteen-minute treatment.

Doing nothing is also a decision

Skip the letter and your plan simply renews itself on January 1 under its new terms. For some people that works out fine. The risk is slow drift: plans evolve a little every year, and a plan that fit you well three years ago can quietly become a poor match without you ever choosing a change. The ANOC exists so the drift at least gets announced.

Our team sees the same story every January: someone discovers a medication jumped tiers or a favorite doctor left the network, and the fix has to wait for the next window. Fifteen minutes in October prevents that call.

A different checklist for Medigap households

Medicare Supplement policies work differently. Their benefits are standardized and do not change each year, so there is no ANOC to read. But your separate Part D drug plan sends its own change letter, and it deserves the same medication-by-medication review, since formularies and pharmacy networks shift annually. One caution: moving from Medicare Advantage back to Original Medicare with a Medigap policy can involve health underwriting in many states, so get guidance before assuming that door is open.

What this means for you

Build a simple baseline before the letter comes: one page listing your premium, your medications and doses, your pharmacy, your doctors, and roughly what you spent out of pocket this year. Then every announced change lands against a fact instead of a feeling. That single page also becomes your script if you sit down with a counselor or agent this fall. If something looks off, the Medicare Plan Finder at Medicare.gov compares every plan in your area, SHIP counselors offer free unbiased help in every state, and licensed agents can walk you through options at no cost.