Key takeaways
Medicare Advantage (Part C) is a private plan that delivers Medicare benefits, often with extra perks and usually with networks. A Medicare Supplement works with Original Medicare to help pay cost-sharing, typically with nationwide access to Medicare providers.
- They are different structures, not two versions of the same product.
- Networks, referrals, and prior authorization are more common with Advantage.
- Medigap premiums can be higher monthly; Advantage copays can add up with use.
- Prescription coverage is usually bundled in Advantage and separate with Medigap.
A simple way to think about it
Original Medicare + Medigap and Medicare Advantage work differently. Compare them across the factors that matter to you: doctors, hospitals, prescriptions, monthly premiums, out-of-pocket costs, travel, referrals and prior authorization.
You can review — you may not always be able to switch easily
Switching from Advantage to Medigap later can involve underwriting in many situations. That is one reason the first decision deserves an unhurried conversation.
Side-by-side snapshot
| Feature | Medicare Advantage | Medicare Supplement |
|---|---|---|
| How it works | Private plan delivers Medicare benefits | Works with Original Medicare |
| Doctors | Usually a network (HMO/PPO) | Generally any U.S. provider that accepts Original Medicare |
| Prescriptions | Often included (Part D) | Separate Part D plan |
| Extra benefits | May include dental, vision, hearing | Generally not included |
| Costs | Copays; yearly in-network max | Premium plus remaining Original Medicare costs |
| Travel | May be limited outside the service area | Nationwide access to providers that accept Original Medicare; limited foreign-travel benefits may apply with some Medigap plans |
Confirm current details on Medicare.gov for your ZIP code.
My Medicare Checkup
Compare these for your situation →
Start My Medicare CheckupYou will get a summary of the questions to verify. You can also talk it through with Alan.
Want the full story? Get my book. Medicare 2026: Choose the Right Plan & Avoid Costly Mistakes walks through how Medicare is built. It does not pick a plan.
For the other pages on this topic, open the Keeping your doctors guide.