If you are one of the 68 million Americans on Medicare, the mail in your mailbox right now is not junk.
Insurance companies want you to pick their Medicare Advantage plan, and they are spending billions to make it look like a no-brainer.
But for many people, that "free" plan can come with a price tag that shows up later.
Original Medicare is the government program: Part A for hospital stays, Part B for doctor visits.
It covers about 80% of most bills, and you pay the other 20% with no ceiling.
A Medigap supplement is a private policy that picks up most of that remaining 20%.
Medicare Advantage is a different animal.
It is a private plan that replaces Original Medicare, usually bundles in drug coverage, and often charges a $0 monthly premium.
Advantage plans save money up front, but they control your care through networks.
You generally must use in-network doctors and hospitals, and you often need referrals or prior approval before treatment.
Supplements cost more each month, but you can see almost any doctor in the country who accepts Medicare, and there are no surprise networks to check.
The math gets real when you actually get sick.
A 2023 Kaiser Family Foundation analysis found that people with Medicare Advantage spent more out of pocket than supplement users when they needed serious care, especially hospital stays and cancer treatment.
Advantage plans cap your yearly costs, but that cap can run $8,000 or more.
A Plan G supplement, by contrast, leaves you with a predictable deductible and little else.
There is another catch that trips people up: switching later is not easy.
In most states, once you leave a supplement, private insurers can charge you more or deny you entirely based on your health history.
If you start with Advantage and get diagnosed with a condition, you may be stuck.
This is why financial advisors often tell healthy people to grab a supplement during their first enrollment window, when insurers must accept them.
It depends on three things: your health, your budget, and your tolerance for paperwork.
If you travel a lot, have ongoing conditions, or want to see specialists without asking permission, a supplement is usually the safer bet.
If you are healthy, want the lowest possible monthly bill, and can live with a network, Advantage can work fine.
The trap is choosing based only on the premium.
A $0 plan that costs you $6,000 during a bad year is not a deal.
Run the worst-case numbers for both options, not the best-case ones.
Before December 7, call your state's Senior Health Insurance Program or a licensed counselor.
Ask one question: what happens if I get really sick?
The answer will tell you more than any glossy brochure. **The bottom line:** Low premiums grab attention, but total yearly cost is the number that matters.
Final Thoughts
Pick the plan that protects you when you are sick, not the one that looks cheapest when you are well.