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
If keeping any Medicare doctor and predictable cost-sharing matters most, many people look at Original Medicare plus Medigap plus Part D. If extra benefits, a lower premium, and a coordinated plan network matter more, many people look at Medicare Advantage. Your ZIP code, doctors, and medications still have to work for the specific plan.
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.