What are the disadvantages of Medicare Advantage?

A plain list of the trade offs in Medicare Advantage, including the six month window that makes the choice harder to reverse than people expect.

Updated September 3, 2026 · 4 min read · by Gerino Alejos

Key points

Medicare Advantage limits you to the plan's list of doctors and hospitals, and some care needs the plan's approval first.
You pay less in a healthy year, and in a heavy year your costs can climb to the plan's yearly limit.
You have six months from the day your Part B starts to buy a Medicare Supplement with no health questions, and after that a company can say no.

Medicare Advantage works well for many people, and most people with Medicare in this county are on one of these plans. It still has trade offs. Doctor choices are narrower, some care needs the plan's approval, and costs rise with how much care you use.

Networks limit where you can go

Every Advantage plan has a network, the list of doctors and hospitals it has a contract with. An HMO (health maintenance organization) covers care only inside that network, except in an emergency. A PPO (preferred provider organization) covers outside care at a higher cost to you.

Either way, your list of doctors is shorter than under Original Medicare, the government plan, where any doctor who takes Medicare will do.

Networks also change. A hospital system or a doctor group can leave a plan at the end of a year. You often learn that from the fall paperwork, not from your doctor.

Prior authorization

Many services need prior authorization, meaning the plan approves the care before you get it. Scans, some surgeries and some drugs are common. So are skilled nursing stays, nursing home care while you recover from a hospital stay.

Most requests get approved. What it costs you is time, paperwork, and now and then a denial you have to appeal while you are unwell. Original Medicare asks for it far less often.

Costs are unpredictable in a heavy year

A low monthly premium looks good while you feel fine. A premium is the monthly bill for the coverage.

Then comes a year with a hospital stay, surgery and rehab. You owe a copay, the set amount you pay for a service, each time you use care. They add up to the plan's out of pocket maximum, the most it can charge you in a year.

Compare that yearly maximum against a year of Medicare Supplement premiums before you decide Advantage costs less. A supplement is a separate policy that pays the share of the bill Original Medicare leaves to you. The answer turns on how much care you use.

Coverage is local

An Advantage plan is built around a service area, the counties where it has its network. If you spend winters elsewhere or split the year between two states, routine care may only be covered at home.

Emergency care is covered anywhere. Regular visits and follow up care usually are not. See how Advantage plans handle travel.

The big one: you may not be able to switch back

You can always drop an Advantage plan and return to Original Medicare. What you may not be able to do is buy the supplement that makes Original Medicare affordable.

Your protected window to buy one runs six months from the month your Part B starts. Part B pays for doctor visits and outpatient care. In those months, no company in Texas can turn you down or charge more for your health history.

After that, companies can ask health questions. That is underwriting, and it means a company may say no.

The trade off runs one way. Joining at 65 takes one form and no health questions. Leaving at 75, after a diagnosis, can mean a supplement company turns you down. Few people hear that part while they are choosing.

Plans change every year

Premiums, copays, networks and extra benefits are set one year at a time. So is the formulary, the list of drugs a plan covers. The plan you liked can look different in January.

That is what the Annual Notice of Change (ANOC) in your fall mail is for. It lists what changes next year, so a yearly review is not optional. See how to read the ANOC.

How to decide with the trade offs in view

None of this makes Advantage a poor choice. It makes it a choice with conditions attached, and they are easier to weigh while you still have every option open.

If you travel a lot, expect heavy medical needs, or want to stop thinking about networks, look closely at the supplement path. If your doctors are local and in network, and the extra benefits matter, an Advantage plan fits well.

Not sure which side of that line you fall on? Talk it through with a licensed agent. Call our McAllen office at (956) 687 3334, or enter your ZIP code in the plan pricing box on this page.

Common follow-up questions

Is Medicare Advantage a scam?

No. These plans are federally regulated and must cover everything Original Medicare covers. The complaints you read are about networks, prior authorization and switching back later.

Can I leave my Advantage plan whenever I want?

You can leave during fall Annual Enrollment, or during the Advantage open enrollment window from January through March. Returning to Original Medicare is allowed. Buying a supplement afterward may mean answering health questions.

Do all Advantage plans require prior authorization?

Most use it for at least some services, though how much varies from plan to plan. It is a fair thing to ask before you enroll.

Want this looked at properly?

We are an independent agency in McAllen serving Hidalgo, Cameron and Starr counties. There is no obligation to talk it through.

Call (956) 687 3334

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