Your Medicare Annual Notice of Change: Read It by Oct 15

The envelope reached Frank Delgado's mailbox in Akron on September 29 last year, fourteen pages thick, and he nearly dropped it in the recycling with the grocery flyers. It was his Medicare plan's Annual Notice of Change. Buried on page four: his monthly premium was climbing from $18 to $41, his cholesterol drug was sliding to a pricier tier, and his cardiologist was leaving the network on January 1.

Frank is made up. The letter is not, and neither is the trap he almost walked into. Every fall, Medicare Advantage and Part D plans mail an Annual Notice of Change, usually shorthanded to the ANOC, telling you exactly how your coverage and costs will shift on January 1. Then most people file it under "deal with later," never open it, and let the plan renew itself.

That reflex is expensive. According to KFF, nearly 7 in 10 Medicare beneficiaries, about 69%, did not compare their coverage against other options during a recent open enrollment period. Actual switching is rarer still: KFF found only around 8% of people in Medicare Advantage drug plans and about 10% in standalone Part D plans voluntarily moved to a different plan. Your plan is counting on that inertia. The ANOC is the one piece of mail that lets you beat it.

What the ANOC letter really tells you

Think of the ANOC as your plan's confession. By federal rule, Medicare Advantage and Part D plans have to mail it so it reaches you by September 30, and it lays out every change taking effect the following January: premium, deductible, copays, the drug formulary, the pharmacy and provider networks, and whether the plan is even sticking around in your area.

It arrives on a deliberate schedule. You get the ANOC by the end of September. Then October 1 through October 14 is what brokers call the "window shopping" period, when the official Medicare Plan Finder at Medicare.gov updates with next year's plans and prices so you can compare. Open enrollment itself, the stretch when you can change plans, runs October 15 through December 7. Whatever you pick, or don't, takes effect January 1.

That timeline is your friend if you use it. The gap between the letter landing and enrollment opening exists so you can read, gather questions, and check your drugs and doctors before the clock starts. Frank had almost three weeks to notice his cardiologist was leaving. He just didn't open the envelope.

What is changing across Medicare for 2027

Even before you read your specific plan's letter, it helps to know the backdrop, because 2027 brings real structural changes that will show up in a lot of ANOCs.

The headline is the Part D out-of-pocket cap. Since 2025, there has been a hard ceiling on what you can pay out of pocket for covered prescriptions in a year. It started at $2,000, rose to $2,100 for 2026, and the Centers for Medicare and Medicaid Services finalized a jump to $2,400 for 2027. Once your covered-drug spending hits that number, you pay nothing for those drugs the rest of the year. The ceiling is drifting up, but it still spares anyone with serious prescription costs from an open-ended bill.

The standard Part D deductible is rising too, to $700 for 2027 from $615 in 2026, an $85 bump, per CMS. Not every plan charges the full deductible, and many waive it on cheaper generic tiers, so your letter is what tells you whether it hits you.

Premiums are the wild card this year. A temporary federal program called the Part D Premium Stabilization Demonstration, which quietly propped up plans and held premium increases down, expires after 2026. Without that cushion, insurers set 2027 premiums on their own. CMS has signaled most enrollees should see monthly increases under $10, but "most" is doing heavy lifting there. Some plans will spike, some will barely move, and a few will drop. This is precisely the number your ANOC spells out for your plan, and precisely the number Frank's letter showed jumping from $18 to $41.

One piece of good news sits in the same mail. A second round of Medicare drug price negotiations takes effect January 1, 2027, cutting prices on 15 more widely used drugs by roughly 44% off their list prices on average. If one of your medications is on that list, your share could fall even as other costs rise.

The five lines in your letter that matter most

You do not need to read all fourteen pages like a contract. Five items carry almost all the money.

Is your plan still being offered? Start here. If the ANOC says your plan is terminating, shrinking its service area, or changing its contract, everything else is moot and you must pick something new. Plan exits have been common the last couple of years as insurers reshuffle around the new drug-cap rules.

Your monthly premium. Compare the 2027 figure against what you pay now. A $20 monthly increase is $240 a year, real money on a fixed income.

Your deductible and copays. Look at the deductible, then at what you pay for a primary care visit, a specialist, and a hospital stay. Small copay changes on services you use often add up fast.

Your drugs and their tiers. This is where people get burned. A drug can stay "covered" while quietly moving to a higher tier, which means a bigger copay, or it can require new prior authorization. Pull out your actual medication list and check each one against the plan's 2027 formulary.

Your doctors and pharmacies. Networks change every year. Confirm your primary care doctor, any specialists you see, and your regular pharmacy are still in network for 2027. Frank's cardiologist leaving was the kind of change no premium comparison would have caught.

Here is what Frank's letter looked like once he laid the two years side by side.

Seen that way, the letter stops being junk mail and starts being a bill preview. Frank's premium alone was set to cost him $276 more over the year, before the higher drug copay and the hassle of finding a new cardiologist.

Why auto-renewing is the pricey default

If you do nothing during open enrollment, your plan renews with all of those changes baked in. That is not a neutral choice. It is a choice to accept whatever your insurer decided, which is why the low comparison numbers from KFF matter so much. Coverage and costs vary widely from plan to plan and shift year to year, and the people who never look are the ones most likely to get surprised at the January pharmacy counter or the first specialist visit.

The fix is not complicated, but it does take an afternoon. When Frank finally sat down with his ANOC and the Plan Finder, he found a comparable plan in Akron with a lower premium and his cardiologist in network. The switch took twenty minutes online during open enrollment. The letter he almost recycled was worth a few hundred dollars and a doctor he trusted.

One caution if you are thinking bigger than drug plans. If you are weighing a move between Medicare Advantage and traditional Medicare, the ANOC is your prompt to think it through carefully, because switching back later can be harder than it sounds once medical underwriting for a Medigap policy enters the picture.

Bottom Line

Your ANOC is the most useful piece of Medicare mail you get all year, and it lands before open enrollment for a reason. Do these four things this week.

1. Find the letter and open it. It reached you by September 30. Dig it out of the pile before October 15, when open enrollment opens.
2. Run the five-line check. Confirm the plan still exists, then compare your premium, deductible and copays, your drug tiers, and your doctor and pharmacy networks against this year.
3. Compare on Medicare's Plan Finder. Starting October 1, enter your exact drug list at Medicare.gov and see whether a cheaper or better plan covers your medications and doctors for 2027.
4. Decide and act by December 7. If a better plan exists, switch during open enrollment so it starts January 1. If your current plan still wins, doing nothing is fine, as long as it is a decision you made on purpose.