If you're turning 65 this year, your mailbox is already a battlefield.
One pile of envelopes promises free gym memberships, dental, and a $0 monthly premium.
Another warns that if you don't buy a Medigap supplement now, you'll be locked out forever.
Both sides are selling hard, and both are leaving out the part that actually costs you.
Start with the names, because they confuse people on purpose.
Original Medicare is the government program: Part A for hospitals, Part B for doctors, and you pay 20% of most outpatient bills with no annual cap.
A Medicare Advantage plan (Part C) is run by a private insurer that takes over your Medicare benefits, usually adds extras, and puts you in a network with prior authorizations.
A supplement, also called Medigap, is different: it pays the 20% that Original Medicare leaves behind, and you keep seeing any doctor nationwide who accepts Medicare.
The premium math is where the marketing gets slippery.
Advantage plans often advertise $0 per month, but that's not the whole bill.
You still pay Part B, and you can face copays per visit, per day in the hospital, and per prescription.
A 2023 KFF analysis found a meaningful share of Advantage enrollees rack up thousands in out-of-pocket costs in a bad year, even with the plan's annual limit.
Medigap premiums run higher each month, but once you pay them, a Plan G or Plan N typically leaves you with very little else owed.
Then there's the catch almost nobody explains at the kitchen table.
With a few exceptions, you get one guaranteed shot to buy a Medigap policy without health questions: a six-month window that starts the month you're 65 and enrolled in Part B.
Miss it, and an insurer in most states can check your health history and charge you more or turn you down.
Advantage plans, meanwhile, let you switch back to Original Medicare every year during open enrollment, but that doesn't guarantee you a supplement.
Advantage plans are paid a set amount per member by the government, so they profit by managing care tightly.
Medigap insurers profit from healthy buyers paying premiums for years.
Brokers earn commissions on whichever product they place you in, and the commission structures are not identical.
None of this makes either product evil, but it does mean the friendly voice on the phone has a financial reason to steer you.
Advantage plans can be the smarter pick if you're healthy, cost-conscious, and want extras like dental or a fitness benefit.
They're also popular for a reason: about half of eligible Medicare beneficiaries now choose them.
Supplements can make more sense if you travel, see specialists, hate prior authorizations, or simply want predictable bills.
It's which one survives your worst-case year.
One practical move: before you sign anything, write down your actual prescriptions and doctors, then ask each plan whether they're covered and what a hospital stay would cost.
Check the plan's star rating and read the evidence-of-coverage document, not the glossy flyer.
If a salesperson rushes you, that's information too.
My take: the Advantage-versus-Medigap fight is mostly a fight over who absorbs your risk, and the ads are designed to keep you from doing that math.
The deadline that deserves real panic is the Medigap guaranteed-issue window, not the countdown timer in a commercial.
Final Thoughts
Decide with your prescriptions and your travel plans in front of you, not with a mailbox full of fear.