The Phone Call That Changed Everything: Medicare Supplement vs. Medicare Advantage
“It Should Have Been Approved”
Gary had done his homework. He’d compared premiums, picked the plan with the lowest monthly cost, felt good about the decision. Then his cardiologist recommended a procedure, and the approval got stuck, denied once, appealed, delayed for weeks while he waited to find out whether his own Medicare Advantage plan would actually cover what his own doctor said he needed.
He wasn’t alone in that experience. According to KFF, Medicare Advantage plans made nearly 53 million prior authorization determinations in 2024, compared to roughly 625,000 in traditional Medicare, denying about 7.7% of those requests. Original Medicare almost never requires that extra approval step at all.
Wondering if a prior-authorization surprise is sitting in your future too? Find out which path actually fits how you use healthcare
Two Paths, Same Destination
Medigap (Medicare Supplement) works alongside Original Medicare. Any doctor who accepts Medicare, nationwide, no referrals, no network. Costs are predictable, plans like Plan G cover nearly every gap Original Medicare leaves behind. You pay a separate Medigap premium and a separate Part D premium.
Medicare Advantage bundles Part A, B, and usually D into one plan, often with a $0 monthly premium. Many add dental, vision, or gym perks. The tradeoff is the one Gary ran into: networks, and prior authorization for many services.
Which One Actually Costs Less?
It depends on how much care you use. Medicare Advantage often wins month-to-month. But get seriously ill, and your exposure can climb to the plan’s out-of-pocket maximum, $9,250 in-network in 2026. Medigap costs more every month but caps that real-world risk far lower.
Want the actual numbers side by side for your situation, not just the marketing pitch? Compare your real cost exposure under both paths
Can I Switch Later?
Going from Medigap to Medicare Advantage is easy. Going back the other way usually means medical underwriting, unless you’re in a guaranteed-issue window. Missouri residents get one extra advantage here worth knowing about: the state’s unique Medigap Anniversary Rule, more on that below.
Will My Doctor Take It?
With Medigap, yes, as long as they accept Medicare. With Medicare Advantage, confirm your specific doctors and hospitals are in-network before you enroll, not after.
Ready to Talk It Through?
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