“I definitely want a PPO.” “I think Plan G is best.” — I hear confident declarations like these on first calls all the time, and here's the thing: about half the time, once we look at the person's actual doctors and prescriptions, the confident answer flips. This is the decision where that happens.
After Parts A and B, every person on Medicare faces one fork: Medicare Advantage or Original Medicare with a Supplement (Medigap). It’s the highest-stakes choice in the whole process — not because one is bad, but because they’re built on opposite philosophies, and switching later isn’t always easy.
What Medicare Advantage really is
A private insurance plan that replaces how you receive your A and B benefits, usually bundling drug coverage and extras like dental, vision, and hearing. Premiums are low — often $0 — because the plan manages costs through its network and through cost-sharing: you pay copays and coinsurance as you use care, protected by an annual in-network out-of-pocket maximum. In many counties that maximum spans a huge range between plans, which is why two “free” plans can be thousands of dollars apart in a bad year.
What a Medicare Supplement really is
Original Medicare stays your primary coverage — the supplement rides alongside and pays most of what Medicare doesn’t (deductibles, the 20% coinsurance). You add a stand-alone Part D plan for drugs. The trade runs the other way: a real monthly premium every month whether you use care or not, in exchange for near-total cost predictability and the widest possible doctor access — any provider in the country who takes Medicare, no referrals, no networks.
“So we paid out our nose.” — how one client described the year their coverage didn't match their health. The right answer to this fork depends on a year like that one, not on the good years.
The five questions that actually decide it
1. Your doctors. Are the ones you’d hate to lose in a particular plan’s network? If you have a specialist relationship you’d protect at any cost — or you split time between states — that pushes toward the supplement path. 2. Your prescriptions. The same drug list can price wildly differently across plans; this is arithmetic, not opinion. 3. Your risk temperament. Advantage = lower fixed costs, variable usage costs. Supplement = higher fixed costs, minimal surprises. Which kind of bill bothers you more? 4. Your budget today vs. a bad year. Be honest about both numbers. 5. Your timing. When you first join, Medigap insurers generally can’t turn you down or charge more for health history — a protection that can fade later in many states. The supplement door is widest open exactly once.
The mistake I see most
Choosing by premium alone. A $0 premium is not $0 cost, and a rich supplement isn’t automatically worth its price for someone who never travels and loves their local network. The plan has to fit your facts — which takes about ten minutes to check with your doctor and drug lists in hand, and that’s precisely what a consultation is.
Where to go from here
Schedule a free Medicare consultation — a conversation about your doctors, prescriptions, and timeline, not a pitch. Want the full picture first? Get the free digital edition of my book, 64+. Or search the plans available at your zip code yourself.
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Written and reviewed by Michael Smith, licensed insurance broker, founder of Guardian Health & Wealth, an independent Medicare agency serving clients nationwide, and author of 64+: Your Ultimate Guide to Medicare & Retirement Planning.
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