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Just over half of everyone eligible for Medicare now gets coverage through a private plan instead of the government program itself. That’s roughly 34 million people, and the number grows every enrollment season. If you’re turning 65 this year, or you’re rethinking your coverage before December, Medicare Advantage is the option you’ll see advertised hardest and understand least.
Here’s the version the commercials leave out.
What Medicare Advantage Really Is
Medicare Advantage, also called Part C, is a private insurance plan that delivers your Part A hospital coverage and Part B medical coverage. The federal government pays the insurer a fixed amount per member each month, and the insurer decides what network you can use, what your copays look like, and which extras it will add to attract you.
Two rules define the whole product. By law, every Advantage plan must cover everything Original Medicare covers. And most plans also fold in Part D prescription coverage, which Original Medicare does not include. That bundling is the big selling point: one card, one insurer, usually a premium of zero dollars beyond the Part B premium you already pay.
What you trade away is freedom. Original Medicare works with almost any doctor or hospital in the country that accepts Medicare. An Advantage plan works with its list, and the list can change every January.
The Costs, in Plain Numbers
The average Medicare Advantage premium runs around $17 a month, and a large share of plans charge nothing on top of the standard Part B premium. That headline number is genuine, which is why the ads work.
The spending just moves to the point of care:
- Doctor visits: typically $0 to $30 for primary care, $20 to $50 for a specialist
- Hospital stays: often a daily copay for the first several days, then fully covered
- Prescriptions: tiered copays that can climb steeply for brand-name and specialty drugs
- Out-of-network care: usually not covered at all, with emergencies as the main exception
The out-of-pocket maximum is the number that actually protects you
For 2025, plans can’t make you pay more than $9,350 in-network for covered Part A and B services. Many set their limit far lower, sometimes between $4,000 and $6,000. Compare that with Original Medicare, which has no annual cap at all unless you buy a supplement. If you end up with a cancer diagnosis or a long hospital stay, that ceiling is the single most important figure in the plan’s summary of benefits. Find it before you look at anything else.
What You Get Beyond Original Medicare
The extras are where plans compete, and they are real, if inconsistently generous. Most include some combination of dental, vision, hearing aid allowances, a fitness membership, an over-the-counter drug allowance, and rides to medical appointments.
Read the limits, not the headlines. A plan advertising a $2,000 dental benefit might cap cleanings and X-rays at $1,500 and put only $250 toward a crown. A hearing aid allowance of $1,000 may only apply at one retail chain. These benefits are worth having, but they rarely replace the coverage people imagine they’re getting.
Where Medicare Advantage Gets Tricky
Networks and referrals
HMOs require you to choose a primary care doctor who coordinates your care and refers you to specialists. PPOs give you more room to see whoever you want, but you pay more and may face out-of-network deductibles. Neither type travels well.
Prior authorization
Before an MRI, a surgery, or an expensive drug gets covered, the plan often has to approve it first. Insurers approve the large majority of requests, but denials happen, and appealing takes weeks you may not have. Ask your specialist a blunt question: does this plan approve this procedure without a fight?
The travel problem
If you spend winters in another state, check whether your plan’s service area covers both addresses. If you travel abroad, know that many plans cover overseas care only in limited emergencies, and some cover none of it.
Comparing Plans Without the Headache
A single county can offer 20 to 50 plans, and the differences that matter are buried in a 100-page document. Start with your prescriptions instead of the premium. Enter every drug you take into Medicare’s Plan Finder at medicare.gov, being precise about dosage, then look at total annual cost rather than monthly cost. A $0 premium plan with poor drug tiers can cost you $2,000 more per year than a plan charging $30 a month.
Then check your doctors. Call the offices directly and ask whether they’re in network for the specific plan you’re considering, not just the insurer. Networks shift between the brand name on the card and the plan underneath it, which is why a step-by-step walkthrough of how to choose between Medicare Advantage plans is worth reading before you commit.
Brand Names You’ll See Everywhere
AARP-branded plans are underwritten by UnitedHealthcare and tend to have broad networks and predictable copays, though the extras vary widely by county. If you want a clear picture of what AARP Medicare Advantage covers and what it charges, that breakdown walks through the trade-offs. Humana builds its pitch around extras and chronic-condition support, and its Medicare Advantage plans differ significantly from one market to the next. Aetna leans on pharmacy tools and flexible networks, with details in this look at how Aetna Medicare plans are structured. The brand tells you something about service, not much about value. Two plans with the same logo can have completely different copays in neighboring counties.
Medicare Advantage or Medigap?
This is the decision underneath the decision. Medigap, or Medicare Supplement, works alongside Original Medicare, and Medigap fills the cost gaps Original Medicare leaves behind with no networks and no referrals. You pay a higher monthly premium, often $100 to $200, and you buy a separate drug plan. In exchange, your out-of-pocket exposure drops close to zero.
The catch is timing. In most states, insurers can reject you or charge more based on health once you’re past your initial enrollment window, and a cancer diagnosis or a heart condition can make switching back expensive or impossible. Advantage plans are easier to join and easier to leave early on. That asymmetry should shape how you decide.
Enrollment Windows You Can’t Miss
Your first chance is the seven-month Initial Enrollment Period around your 65th birthday. After that, Annual Enrollment runs October 15 to December 7, and changes take effect January 1. Between January 1 and March 31 there’s a Medicare Advantage Open Enrollment Period that lets you switch to a different Advantage plan or drop back to Original Medicare once.
Miss the window, and you generally wait a year. Set a calendar reminder for early October, not December 6.
The Five Numbers to Write Down
Before you sign, pull these from the plan’s summary of benefits: the monthly premium, the annual drug deductible, the maximum out-of-pocket limit, the specialist copay, and the highest tier copay for a drug you actually take. If a plan won’t give you those five numbers in writing, that alone tells you something.
Write them on the back of the summary and keep the page with your insurance card. When you’re sitting at a hospital admissions desk at 11 p.m. and someone asks about your coverage, that single sheet is worth more than every advertisement you saw during enrollment season.
