Open enrollment season brings a flood of slick commercials promising freebies, dental perks, and zero premiums.
But buried in the fine print is a decision that can swing your annual health care costs by $5,000 or more.
The battle between Medicare Advantage and Medicare Supplement plans isn't just jargon — it's the single biggest money call most retirees will make.
Original Medicare covers hospital and doctor visits but leaves you on the hook for 20% of most bills with no annual cap.
A Medicare Supplement plan, often called Medigap, picks up most of that leftover tab.
Medicare Advantage, by contrast, is a private plan that replaces Original Medicare and usually bundles in extras like vision and hearing — but it controls costs through networks and prior authorizations.
The premium math looks lopsided at first glance.
A Medigap Plan G can run $130 to $200 a month or more depending on your age and state, on top of the standard Part B premium of $174.70 in 2024.
Many Advantage plans advertise $0 premiums.
That gap is exactly why Advantage now covers more than half of all eligible Medicare beneficiaries, according to federal data.
Advantage plans cap in-network out-of-pocket spending around $8,850 in 2024, and that ceiling can climb higher for out-of-network care.
A rough year with a hospital stay and specialist visits can push you toward that limit fast.
Medigap, meanwhile, often leaves you paying almost nothing beyond the premium once you're enrolled.
You get a one-time, six-month Medigap open enrollment window that starts when you're 65 and enrolled in Part B.
Miss it, and insurers in most states can reject you or charge more based on your health history.
Switch to Advantage first and develop a condition, and you may be locked out of the supplement market for good.
You generally need referrals to see specialists, and care must be pre-authorized.
Denials happen, and a government watchdog has flagged concerns about plans delaying or denying care that should be covered.
Medigap users skip that maze and can see any provider nationwide who accepts Medicare.
If you can afford the higher premium and want predictable costs with no networks, Medigap tends to pay off — especially if you travel or have ongoing health needs.
If you're healthy, budget-focused, and comfortable with managed care, an Advantage plan can work, but you should bank the premium savings for the bad year that may come.
Compare total costs, not just the monthly number.
Read the out-of-pocket maximum, check whether your doctors are in network, and look up drug coverage under each plan's formulary.
A few hours of homework now can save you thousands later.
My take: the $0 premium pitch is a masterclass in selling the sizzle, not the steak.
For most people with any savings cushion, Medigap's predictability is worth the monthly hit — and once that enrollment window shuts, you don't get a do-over.
Final Thoughts
Choose like your wallet depends on it, because it does.