Medicare Advantage vs. Medicare Supplement: A Plain-English Comparison

Once you're eligible for Medicare, you face a fork in the road: stick with Original Medicare and add a Medigap (Supplement) policy, or replace it with a Medicare Advantage plan. Each route has its own trade-offs.

Medicare Advantage (Part C) bundles Parts A, B, and usually D into one plan from a private insurer. Premiums are often $0 (you still pay Part B), and many plans include dental, vision, hearing, and gym memberships. The catch: provider networks (HMO/PPO) and prior-authorization rules.

Medicare Supplement (Medigap) sits on top of Original Medicare and pays the gaps — copays, coinsurance, deductibles. You can see *any* doctor in the U.S. who accepts Medicare. No networks, no referrals. The trade-off is a monthly premium that often runs $100–$250.

Rule of thumb: if you travel often or want maximum doctor choice, Medigap is hard to beat. If you're in good health, prefer predictable copays, and value extras like dental, Advantage usually wins on total cost.

One critical detail: switching from Advantage *back* to Medigap later can be hard — many states allow underwriting, which means a pre-existing condition can lock you out. Pick carefully the first time.