Every fall, the mailbox fills up with glossy promises: zero-dollar premiums, free dental, groceries on a debit card, gym memberships.
Medicare Advantage plans spent years selling themselves as the smarter, cheaper alternative to old-fashioned Medicare supplements.
The pitch works because it's partly true — and partly a trap that shows up later.
Original Medicare pays about 80% of covered costs, and a Medigap supplement picks up most of the rest.
You pay a monthly premium for that supplement, but you can generally see any doctor in the country who takes Medicare, and you don't need referrals.
Medicare Advantage, by contrast, is a private insurance plan that replaces the government's payment system.
The government pays the insurer a set amount per member, and the insurer keeps whatever it doesn't spend on care.
That last sentence is the whole ballgame.
When an insurer profits by spending less on your care, every prior authorization, every out-of-network denial, and every "we need to review that" becomes a revenue decision.
A 2022 federal report found that Medicare Advantage plans denied 13% of prior authorization requests in a single year — and when patients appealed, about 80% of those denials were overturned.
Read that again: the denials were wrong four times out of five, but only for people who fought them.
Those dental, vision, and grocery benefits vary wildly by plan and county, and they can shrink or vanish the next plan year.
Your doctors can drop out of the network mid-year.
Your prescriptions can move to a pricier tier.
The supplement side has its own gut punch: premiums.
A Medigap Plan G can run $120 to $200 a month or more depending on age, gender, and state, on top of the standard Part B premium, which is $185 a month in 2025.
That's real money for a household on a fixed income.
And here's the catch that quietly ruins retirement planning — in most states, Medigap insurers can charge you more or reject you outright based on health once you're past your initial enrollment window.
Switch to Advantage to save money at 67, develop a condition, and try to switch back at 74, and you may find the door locked.
Medicare Advantage now covers more than half of all eligible beneficiaries, and companies like UnitedHealth and Humana have built enormous profit centers around it.
Politicians like it because it looks cheaper on paper.
You might win too — if you're healthy, live in a dense metro area with strong networks, and never need expensive specialists.
The honest answer is that neither option is universally better.
It depends on your doctors, your medications, your zip code, and how much risk you can absorb.
The people who get burned are usually the ones who picked based on a mailer.
Before you decide, do three things: check whether your specific doctors and hospitals are in-network, price your actual prescriptions under each plan, and look up your state's Medigap rules.
A free hour with a State Health Insurance Assistance Program counselor beats a free gym membership every time.
The real scandal isn't that Medicare Advantage exists.
It's that the choice is engineered to be confusing at exactly the moment you're least equipped to untangle it.
Final Thoughts
Read the fine print, ask who profits from your answer, and assume the "free" plan has a bill somewhere.