This is THE most important Medicare decision you'll make. The wrong choice can cost thousands — or lock you out of options forever. Let's break it down.
After you enroll in Medicare Parts A and B, you have a fundamental choice: how do you want to receive and pay for your healthcare?
Path 1: Original Medicare + Medigap + Part D — You keep government-run Medicare and add a private supplement (Medigap) to cover the gaps. You also buy a separate Part D drug plan.
Path 2: Medicare Advantage (Part C) — You switch to a private plan that replaces Original Medicare. It bundles everything (hospital, doctor, often drugs) into one plan with one card.
Both paths are valid. Neither is universally "better." The right choice depends on your health, your budget, your doctors, and your tolerance for trade-offs.
This decision trips up more people than any other in Medicare. Insurance agents push Advantage plans because the commissions are higher. But some people belong in Medigap, and some belong in Advantage. There's no one-size-fits-all. What matters is whether YOU understand the trade-offs before you commit.
| Feature | Original Medicare + Medigap | Medicare Advantage |
|---|---|---|
| Monthly premium | Part B ($202.90) + Medigap ($50–$300+) + Part D ($0–$100+) | Part B ($202.90) + MA plan ($0–$50 typical) |
| Out-of-pocket maximum | Medigap covers most/all gaps — effectively capped | Capped by law ($8,850 in-network max in 2026) |
| Doctor choice | Any doctor in the U.S. who accepts Medicare | Network only (HMO) or in-network preferred (PPO) |
| Referrals needed | No | Often yes (HMO); usually no (PPO) |
| Drug coverage | Separate Part D plan required | Usually built in |
| Extra benefits | None — medical only | Often includes dental, vision, hearing, fitness, OTC |
| Travel coverage | Works anywhere in the U.S. — some Medigap plans cover foreign travel | Usually limited to plan's service area |
| Prior authorization | Rarely required | Common for procedures, imaging, specialists |
| Switching flexibility | Medigap: locked after initial enrollment (medical underwriting may apply later) | Can switch plans annually during AEP |
| Best for | People who want maximum doctor choice, travel often, or have complex health needs | People who want lower premiums, extra benefits, and don't mind using a network |
A printable side-by-side comparison with 2026 costs, plan letters, and the questions to ask before choosing.
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Medigap (Medicare Supplement) plans are standardized by the federal government into lettered plans (A, B, C, D, F, G, K, L, M, N). Every Plan G from any company covers the exact same benefits — only the premium differs.
Plan G — The most popular Medigap plan. Covers nearly everything except the Part B deductible ($283/year in 2026). Once you pay that $283, you have essentially zero out-of-pocket costs for the rest of the year for any Medicare-covered service.
Plan N — Lower premium than G, but you pay up to $20 copays for some office visits and up to $50 for ER visits that don't result in admission. Good for people who don't go to the doctor frequently.
Plan F — Covers everything including the Part B deductible. Only available if you were Medicare-eligible before January 1, 2020.
You have a 6-month Medigap Open Enrollment Period starting the month your Part B begins. During this window, insurance companies cannot deny you or charge you more based on your health. After this window closes, they can. This is your one guaranteed shot at Medigap — don't waste it.
Plan G is king for a reason. The only thing it doesn't cover is the $283 Part B deductible. But the premium difference between Plan G and the old Plan F (which covers that $283) is often more than $283/year. So you'd pay more in premiums to save $283. Do the math — G almost always wins.
Medicare Advantage plans are run by private insurance companies but approved by Medicare. They must cover everything Original Medicare covers, and most add extras.
Lower premiums: Many MA plans have $0 monthly premiums (you still pay Part B).
Extra benefits: Dental, vision, hearing aids, fitness memberships, OTC allowances, and sometimes grocery cards.
Out-of-pocket cap: Unlike Original Medicare, MA plans cap your annual out-of-pocket costs ($8,850 max in-network in 2026).
All-in-one: One card, one plan for medical + drugs + extras. Simpler to manage.
Network restrictions: HMO plans require you to use in-network doctors. If your specialist isn't in the network, you either switch or pay out-of-pocket.
Prior authorization: MA plans often require pre-approval for procedures, imaging, and specialist visits. This can delay care.
Geographic limits: Coverage may not work well if you travel or spend time in another state.
Plan changes annually: Benefits, networks, and formularies can change every January. Your doctor could drop out of network or your drug could be removed from the formulary.
Here's what the TV ads won't tell you: Medicare Advantage plans make money by managing your care — which sometimes means limiting your care. Prior authorization denials are a real issue. A 2022 OIG report found that 13% of prior authorization denials by MA plans were for services that actually should have been covered. That doesn't mean all MA plans are bad — many are excellent. But go in with your eyes open.
Want to see any doctor in the country without referrals or network restrictions. Have complex health conditions requiring multiple specialists. Travel frequently or split time between states. Can afford the higher monthly premium for peace of mind. Want predictable costs with virtually no surprises. Are within your 6-month Medigap Open Enrollment window right now.
Want lower monthly premiums and are comfortable using a network. Value extra benefits (dental, vision, hearing, fitness, OTC). Have a chronic condition and want coordinated care (especially C-SNPs or D-SNPs). Are dual eligible for Medicare and Medicaid. Don't travel much and most of your doctors are in one area. Prefer an all-in-one plan with one card.
If you're healthy at 65 and picking for the first time, here's my honest take: Medigap gives you more freedom; Advantage gives you more extras at lower cost. The catch is that Medigap freedom comes with a price tag, and Advantage extras come with network strings attached. Neither is wrong — but the Medigap window is the one you can't get back. If you're unsure, seriously consider getting Medigap now (you can always switch to Advantage later), because you can't always go back to Medigap without medical underwriting.
This is the most important Medicare decision you'll make. Chapter's licensed advisors compare every Medigap and Medicare Advantage plan in your area, check your doctors and medications, and help you choose — completely free.
Chapter's advisors are licensed, independent, and don't charge you anything — they're paid by insurance companies, not by you.