If You Do Nothing During Medicare AEP, Here Is Exactly What Happens for 2027

Annual Enrollment opened on October 15. Between now and December 7, most Houston households on Medicare will do exactly what they did last year: nothing.

That is not automatically a mistake. CMS expects about eight in ten Medicare Advantage enrollees to be able to stay in their current plan at the same premium or a lower one for 2027. For a lot of people, doing nothing lands somewhere reasonable.

But “nothing” is not nothing. It is a decision with mechanics, and the mechanics are worth knowing before you make it by default.

The short answer: if your plan still exists in your county for 2027, you are automatically enrolled in its 2027 version on January 1 — with whatever that version changed about premiums, drug tiers, networks and extras. Nobody asks you to confirm. The document that told you what changed was the Annual Notice of Change, which arrived by September 30. If your plan is ending, different rules apply and you have longer than December 7.

What “doing nothing” actually does

Medicare Advantage and Part D plans are annual contracts. Each autumn a plan tells CMS what it will look like next year, and each autumn you get the chance to leave. If you do not leave, you are renewed.

The crucial detail is what you are renewed into. Not the plan you have been using all year — the plan as it will exist on January 1, with next year’s premium, next year’s drug list, next year’s network and next year’s cost sharing. Your plan ID stays the same. Much of what sits behind it may not.

Three things follow:

• Nobody asks you to confirm. There is no form, no phone call and no checkbox. Silence is consent.
• Your January premium can differ from your December premium without anything having gone wrong.
• A drug that was covered in December can be uncovered in January, or sit on a different tier with different cost sharing.

None of this is a trick. Plans are required to tell you in advance, in writing, and they do. The gap is that the telling happens in a document most people do not read.

The document that explains it

Your Annual Notice of Change arrived by September 30. It is the single most useful piece of paper in this process and it is written to be skimmed past.

If you still have it, the sections worth reading are the premium, the deductible, the maximum out-of-pocket, the drug tier changes, and any note about the provider network. If you do not still have it, call the number on your member card and ask them to send it again, or look for it in your plan’s online account. It is worth the ten minutes.

We went through that document line by line, in the order the sections actually appear, in the Annual Notice of Change decoder. If you read one other thing before deciding to stay put, read that.

One distinction people get wrong: the Annual Notice of Change tells you your plan is changing. A non-renewal notice tells you your plan is ending. Those are different letters with different deadlines, and we come back to the second one below.

Why CMS says most people can stay put

In its September 28 release on the 2027 landscape, CMS said it expects the Medicare Advantage and Part D markets to remain stable, and gave some numbers behind it.

CMS also says more than 99% of beneficiaries can access at least one MA plan and 97% can access ten or more, that supplemental benefits like dental, vision and hearing are expected to remain stable, and that about eight in ten MA enrollees can remain in their current plan with the same or a lower premium.

Take that seriously — it is the agency’s own projection and it argues against panic. Then notice what it does not say. It is an average across the whole country, it is about premiums rather than drug costs or networks, and eight in ten leaves two in ten for whom staying put costs more. The useful question is not whether the market is stable. It is which group you are in, and that is answerable from your own paperwork.

If you are in Original Medicare with a drug plan

Roughly half of Houston’s Medicare population is not in a Medicare Advantage plan at all. If you have Original Medicare plus a stand-alone Part D drug plan — with or without a Medigap policy alongside it — most of what you read about AEP is written for somebody else, and the mechanics of doing nothing are different in one important respect.

Original Medicare itself does not renew annually in the way a private plan does. Parts A and B carry on, with no network to change and no benefits to be withdrawn. Your Medigap policy, if you have one, generally renews without the yearly benefit redesign that Medicare Advantage plans go through. So for the medical half of your coverage, doing nothing is close to genuinely nothing.

Your drug plan is the exception, and it is the part most likely to move. A stand-alone Part D plan renews with a new formulary, new tiers and new cost sharing every January, exactly as the drug half of an MA plan does. It also sits on the wrong side of a divergence that CMS’s own projections make plain: the average stand-alone Part D premium is projected to rise from $35.09 to $36.00, while the average Part D premium inside a Medicare Advantage plan is projected to fall from $11.32 to $7.00. Those are different markets, and only one of them is being subsidised by medical-side rebates.

That divergence is not a reason to abandon Original Medicare — the reasons people hold it, no network and no prior authorisation on most services, are unaffected by what a drug premium does. It is a reason to shop the drug plan specifically, every single year, rather than letting it roll. And if your drug plan is one of those not continuing into 2027, see what a Part D non-renewal notice means, because that letter puts you on a different clock.

Where doing nothing usually costs money

In our experience the premium is rarely what bites. Prescriptions are.

Formularies are rebuilt every year. A drug can move to a higher tier, acquire a prior authorization or step therapy requirement, hit a quantity limit, or come off the list entirely. None of that changes your premium, and all of it changes what you pay at the counter.

The structure underneath also changed for 2027. The standard Part D deductible rises to $700 from $615, and the annual out-of-pocket threshold rises to $2,400 from $2,100 — both from CMS’s own 2027 Rate Announcement. We cover what that means in practice in our guide to the Part D out-of-pocket cap, and the reason premiums moved in why your 2027 Part D premium jumped.

So the single highest-value thing you can do, if you do only one thing, is check every prescription you take against your plan’s 2027 drug list. Medicare Plan Finder does this if you enter your drugs at the correct doses, which we walked through in how to use Plan Finder from a Houston ZIP code.

When doing nothing is a different decision

Everything above assumes your plan still exists in your county next year. If it does not, the rules change in your favour.

At least eleven insurers are leaving Medicare Advantage for 2027, and UnitedHealthcare and Humana sent non-renewal letters dated October 2 covering more than a million members between them. If you got one of those, you are not on the December 7 clock — CMS guidance gives you a special enrollment period running through the last day of February, and the month you enrol decides when coverage starts.

Doing nothing in that situation does not renew you into anything. You revert to Original Medicare on January 1, with no out-of-pocket maximum and no drug coverage. That is a materially worse outcome than the renewal we have been describing, and it is why the distinction between the two letters matters. The full mechanics are in what to do when your plan is cut for 2027.

When staying put is genuinely the right call

Worth saying clearly, because articles like this one tend to imply that everybody should switch. Most people should not.

Your plan is one of the eight in ten. The premium held or fell, your drugs are still covered at the same tiers, your doctors are still in network, the out-of-pocket maximum did not jump. Staying is right, and you reached that conclusion on evidence instead of inertia.

You take no regular prescriptions and use little care. The usual sources of unpleasant surprise do not apply to you. A quick network check and you are done.

Switching would cost you something specific. A relationship with a physician who is only in your current plan’s network, say, or a supplemental benefit you genuinely use. A higher premium can be the right price for keeping a cardiologist.

You are in a plan nothing else matches. If you are dually eligible for Medicare and Texas Medicaid, an integrated D-SNP may fit your circumstances in ways an ordinary plan does not — see integrated D-SNPs in Harris County.

The difference between a good decision to stay and a bad one is not the outcome. It is whether you looked.

The three-thing check

If the full comparison feels like too much, do this instead. It takes about twenty minutes and catches most of what goes wrong.

1. Your doctors. List them by practice name, then call each practice and ask whether they are in network with your plan for 2027. Name the plan exactly. Do not rely on the directory alone.
2. Your drugs. Every prescription, at the exact dose, checked against your plan’s 2027 formulary. Note any that moved tier, acquired a restriction, or came off.
3. Your maximum out-of-pocket. Find the 2027 number in your Annual Notice of Change and compare it with 2026. It is the figure that matters in a bad year, and it rarely gets read.

If all three come back clean, staying put is a decision rather than a default, and you can stop. If any one of them comes back wrong, that is your signal to compare properly. Our Houston AEP checklist has the longer version.

If you decide wrong

There is one more safety net, and it is narrower than people assume.

If you are in a Medicare Advantage plan on January 1, the Medicare Advantage Open Enrollment Period lets you make one change between January 1 and March 31 — switch to another MA plan, or drop back to Original Medicare. One change, not an open season. We covered it in the January 1 to March 31 window.

Two limits worth knowing now rather than in February. It does not apply if you are in Original Medicare on January 1 — it is for people already in an MA plan. And it does not help with Medigap: returning to Original Medicare does not come with a guaranteed right to buy a supplement, and in Texas a Medigap insurer can medically underwrite you outside protected windows. That asymmetry is why the October decision carries more weight than the January one.

Frequently asked questions

Talk it through with someone local

Most years, for most people, staying put turns out to be right. That is not an argument for not looking — it is an argument for looking quickly, so you can stop thinking about it.

Bring your Annual Notice of Change, a list of your doctors by practice name, and your prescriptions with doses. We will tell you which group you are in. If your plan is fine, we will say so and you can get on with your October.

Call 832-400-6538 or email sara@wisehealthins.com, or read more about the Medicare plans and Medicare Advantage options we work with. We serve clients from North Houston and South Houston.

This article is for general information and is accurate as of October 19, 2026. It is not medical, tax or legal advice. CMS projections are national estimates and do not describe any individual plan. Plan availability, networks, formularies and costs vary by plan and county, and your own Annual Notice of Change and plan documents govern where this article is general. Talk to a licensed agent before choosing a plan.