Every fall, millions of Americans on Medicare face the same confusing fork in the road: stick with original Medicare and add a supplement plan, or switch to a privately run Medicare Advantage plan that bundles everything together.
Lower premiums, extra perks like dental and vision, sometimes even a grocery allowance.
But consumer advocates warn that the fine print can bite you later in ways that are hard to undo.
Original Medicare pays roughly 80% of covered costs, leaving you on the hook for the other 20% with no annual cap.
A Medigap supplement picks up most of that gap, and you can use any doctor or hospital in the country that accepts Medicare.
Medicare Advantage, by contrast, works more like an HMO or PPO.
You often stay in a network, and the plan manages your care in exchange for capping your yearly out-of-pocket spending.
A Medigap Plan G can run $120 to $200 a month or more depending on your age and state, on top of the standard Part B premium.
Advantage plans frequently advertise $0 premiums, which is why they now cover more than half of all eligible beneficiaries.
But that low upfront number can mask copays for hospital stays, specialist visits, and expensive drugs that add up fast.
When you first enroll in Medicare at 65, you get a one-time guaranteed window to buy any Medigap policy at standard rates, regardless of your health history.
Miss that window, and insurers in most states can charge you more or reject you outright based on conditions like diabetes, heart disease, or cancer.
Advantage plans don't have that restriction, so they're easy to join later.
Someone signs up for Advantage to save money while healthy, then develops a serious illness, wants to switch to a supplement for wider access, and discovers they can't afford the underwritten price, or can't get in at all.
A few states, including New York, Connecticut, Massachusetts, and Maine, require year-round guaranteed issue, but most don't.
Advantage plans usually include Part D, while original Medicare requires a separate drug plan.
Formularies and prior authorizations vary widely, and a medication that's cheap on one plan can be pricey on another.
If you travel a lot or split time between states, network-based Advantage plans can leave you scrambling for in-network care far from home.
If you can afford the supplement premium and want maximum flexibility and predictable costs, Medigap tends to win over the long haul.
If you're healthy, cost-sensitive, and comfortable with a network, Advantage can work well, especially if you check that your doctors and hospitals are covered and your prescriptions are on the formulary.
Either way, read the annual notice of changes.
Plans alter networks, copays, and drug lists every year.
The honest take: this isn't a set-it-and-forget-it decision.
It's one of the few choices in retirement that's genuinely hard to reverse, so it deserves more than a mailer and a phone call.
Final Thoughts
Compare total yearly costs, not just the monthly premium, and factor in what happens if your health changes.