Turning 65 comes with a mailbox full of promises, and the biggest fork in the road is deciding between Medicare Advantage and a Medicare Supplement.
Pick one path, and you may face copays and network rules.
Pick the other, and you may pay a higher monthly premium but face fewer surprises.
The difference can add up to thousands of dollars a year, so it pays to understand what you're actually buying before you sign.
Medicare Advantage, also called Part C, is run by private insurers that contract with the government.
You typically keep paying your Part B premium, and many plans advertise $0 extra monthly cost.
In exchange, you agree to use the plan's network of doctors and hospitals, and you often need referrals for specialists.
Plans frequently bundle in dental, vision, and hearing benefits that original Medicare doesn't cover, which is why they've grown popular.
Advantage plans can charge copays for doctor visits, hospital stays, and procedures, and those costs reset every year.
There's also an annual out-of-pocket maximum, which in 2024 can run as high as $8,850 for in-network care.
If you get seriously ill or need expensive treatment, you could hit that ceiling.
For healthy people who rarely see a doctor, the math often works in their favor.
Medicare Supplement plans, also called Medigap, work differently.
You pay a monthly premium to a private insurer, and in return the plan picks up most or all of the costs that original Medicare doesn't cover, like coinsurance and deductibles.
There are no networks, so you can see any provider who accepts Medicare.
You can also see specialists without a referral, which matters if you develop a complex condition.
Medigap Plan G, one of the most popular options, can cost $100 to $200 or more per month depending on your age, health, and where you live.
Unlike Advantage plans, Medigap premiums tend to rise as you get older.
You also need to buy a separate Part D drug plan, and Medigap doesn't include dental, vision, or hearing.
But once you're enrolled, your out-of-pocket exposure is far smaller.
The timing of your decision matters more than most people realize.
When you first enroll in Medicare, you get a six-month Medigap open enrollment window, and insurers must sell you a policy regardless of your health.
Miss that window, and you may face medical underwriting, which means a insurer can charge you more or deny you outright.
That's why switching from Advantage to Medigap later can be difficult or impossible if you have health conditions.
If you have ongoing medical needs, travel often, or want the freedom to see any doctor, a Supplement plus a drug plan may offer more predictable costs.
If you're healthy, want lower upfront premiums, and can live with network rules, an Advantage plan can work well.
Run the numbers for your own prescriptions and doctors, because a plan that looks cheap on TV may not be cheap for you.
The honest truth is that neither option is universally better, and the marketing on both sides is designed to make you stop comparing.
Take the time to check whether your doctors are in a plan's network and whether your drugs are covered before you commit.
Final Thoughts
A few hours of research now can save you real money and real stress later.