What Happens If You Do Nothing During Medicare Open Enrollment?

Every autumn brings the same quiet question from people who are tired of the commercials: do I actually have to do anything?

It’s a fair question, and the honest answer has two halves. For a lot of people, the answer is genuinely no — their plan still fits, and letting it roll over is the right call. For others, doing nothing is how a coverage problem gets discovered at a pharmacy counter in January.

Here’s precisely what happens when you take no action, and how to tell which group you’re in.

The default: your plan renews into next year’s version

If you’re enrolled in a Medicare Advantage plan or a standalone Part D drug plan and you do nothing between October 15 and December 7, your plan generally continues automatically on January 1.

The crucial detail is in the wording. You are not renewed into the plan you have now. You are renewed into next year’s version of it — with whatever changed to the premium, the deductible, the drug list, the pharmacy network, the provider network, the prior authorization rules, and the extra benefits.

That is exactly what the Annual Notice of Change exists to tell you, and why it arrives by September 30. Our walkthrough of how to read it covers the five sections worth checking.

When doing nothing is genuinely fine

Let’s be fair to the do-nothing option, because plenty of good reviews end exactly there.

If you’ve read your ANOC and the premium is similar, your medications are still covered at the same tier, your doctors and hospital are still in network, your pharmacy is still preferred, and your maximum out-of-pocket hasn’t jumped — then staying put is a perfectly good decision. You don’t earn points for switching.

Every year a meaningful share of the people we sit down with keep the plan they already have. The value of the review wasn’t a change. It was the certainty.

The three situations where it goes wrong

1. Your plan is being discontinued

This is the big one, because it breaks the assumption entirely. If your plan is not being offered next year, there is nothing to renew into.

Depending on the circumstances, you may be returned to Original Medicare — and if your coverage included drugs, you could end up without Part D coverage, which risks a late enrollment penalty on top of uncovered prescriptions. Plans that are ending must notify you, and a discontinuation comes with its own Special Enrollment Period, so you have options. But only if you open the letter.

This isn’t hypothetical this year: we wrote about the Humana plans being cut for 2027 and roughly 600,000 members affected.

2. A medication moved tiers or left the formulary

Formularies change every year. A drug can move to a higher tier, gain a prior authorization requirement, or come off the list altogether — and none of that changes your premium, so nothing looks wrong until you refill.

This is the most common expensive surprise, and it’s invisible unless you check your actual medication list against next year’s formulary.

3. A doctor or hospital left the network

Networks are renegotiated annually. Your plan can renew perfectly while the cardiologist you’ve seen for a decade moves out of network. We covered what to do when that happens in your doctor just left your plan’s network.

What if you’re on Original Medicare?

If you have Original Medicare with a Medicare Supplement, this works differently and more calmly.

Original Medicare doesn’t need renewing — it continues. Medigap policies are guaranteed renewable as long as you pay the premium, so there’s nothing to re-elect each autumn. Your Medigap premium can still change, but that arrives as a rate notice from your insurer rather than an ANOC.

The one piece that does deserve an annual look is your standalone Part D plan, which changes like any other drug plan and will auto-renew into next year’s version.

A five-minute version of the check

If you do nothing else this season, do this:

1. Find your ANOC (it arrived by September 30, possibly by email).
2. Check your medications — by name and dose — against next year’s drug list.
3. Check your doctors and hospital are still in network for next year.
4. Look at the premium, deductible, and maximum out-of-pocket for a jump.
5. Decide on purpose — and if everything still fits, do nothing with confidence.

That’s the whole thing. Our September prep checklist covers how to gather the inputs if you’d like to be thorough.

Frequently asked questions

Will my plan automatically renew? Generally yes, if it’s still being offered — into next year’s version of the plan, with all its changes.

What if my plan isn’t offered next year? You’ll be notified, and you get a Special Enrollment Period. Don’t ignore it: without acting, you could end up in Original Medicare without drug coverage.

Does my Medicare itself end if I do nothing? No. Your Medicare eligibility is not at risk. This is only about the private plan layered on top.

Can I change my mind after January 1? Medicare Advantage members get the MA Open Enrollment Period, January 1 to March 31, for one switch. Part D-only enrollees generally don’t have that option, so a drug plan mistake tends to last the year.

I have a Medigap plan — do I need to do anything? Usually not for the Medigap itself. Do review your standalone Part D plan, which changes annually.

Is it bad to keep the same plan every year? Not at all — as long as it’s a checked decision rather than an assumed one.

Doing nothing, on purpose

There’s no prize for changing plans, and there’s nothing wrong with keeping coverage that works. The only thing worth avoiding is finding out in January what you could have known in October.

If you’d like a second pair of eyes on your ANOC before December 7 — including the answer “your plan is still your best option” if that’s what the comparison shows — reach out for a free, no-obligation review or call 904-654-5450. Kate Spilsbury (RSSA®, CMIP®) is an independent, licensed agent based in Jacksonville, serving Northeast Florida and Camden County, GA.

This article is educational and not medical, tax, or legal advice. Plan renewal rules, benefits, and networks vary by plan and service area — confirm details in your own plan documents. Mere Benefits is not connected with or endorsed by the U.S. government or the federal Medicare program. We don’t offer every plan available in your area.