Every fall, roughly 60 million Medicare enrollees get buried in a pile of glossy mailers promising free dental, free gym memberships, and a $0 monthly premium.
The pitch comes from Medicare Advantage plans, the privately run alternative to original Medicare.
What the ads rarely lead with is the part where you can end up paying for those perks later.
Original Medicare (Parts A and B) pays its share, and you cover the rest unless you buy a Medigap supplement policy to fill the gaps.
Medicare Advantage, also called Part C, replaces that structure with a private plan that often bundles drug coverage and extras.
Open enrollment runs October 15 to December 7 each year, and the marketing blitz is not accidental.
The advantage of Advantage is the sticker price.
Many plans show a $0 premium on top of the standard Part B charge, which in 2024 runs about $174.70 a month for most people.
The government pays the insurer a set amount per member, and the plan keeps whatever it doesn't spend on care.
That's not a conspiracy — it's the business model — but it's why networks, prior authorizations, and copays are where the real math lives.
Medigap plans sold by private insurers pick up most or all of what Medicare doesn't, and you can see any provider nationwide who accepts Medicare.
The trade-off is the monthly premium, often $100 to $200 or more depending on your plan letter and state.
You pay more up front for fewer surprises later.
The catch that trips people up is switching.
In most states, Medigap insurers can reject you or charge more based on health history once you're past your one-time guaranteed enrollment window, which generally starts when you first sign up for Part B.
Go with Advantage first and develop a health condition, and moving back to a supplement can be costly or impossible.
A handful of states, including New York and Connecticut, have looser rules, but most don't.
Advantage plans profit when members stay healthy, and supplement carriers collect steady premiums.
Brokers earn commissions either way, which is worth knowing when someone calls to "help" you choose.
A 2022 report from the Kaiser Family Foundation found that Advantage enrollees with certain conditions faced higher rates of prior-authorization denials, while an earlier federal study flagged concerns about upcoding — billing for sicker patients than warranted.
None of this means Advantage is a trap or that Medigap is the answer for everyone.
If you're healthy, live near a strong network, and want low fixed costs, Advantage can pencil out.
If you travel, see specialists, or want predictable bills, a supplement plus a Part D drug plan often wins despite the premium.
The practical move: list your actual doctors and prescriptions, then check each plan's formulary and network before you're swayed by a freebie.
Compare total yearly costs, not the monthly headline.
And read the denial and appeal rules — that's where the money hides.
The closing take: the marketing war between these two products is louder than it is useful.
Your doctors, drugs, and tolerance for surprise bills matter more than any television ad.
Final Thoughts
Pick based on your real medical life, not the free tote bag.