What Is Medicare Advantage?
Medicare Advantage (Part C) is an alternative to Original Medicare. Instead of getting your Part A and Part B benefits directly from the federal government, you receive them through a private insurance company approved by Medicare. The federal government pays these insurers a set amount to cover your care.
Most Medicare Advantage plans also include Part D prescription drug coverage, bundling hospital, medical, and drug benefits into a single plan. Many additionally offer extra benefits that Original Medicare does not cover — such as dental, vision, hearing, and fitness memberships.
Medicare Advantage vs. Original Medicare: Side-by-Side
| Feature | Original Medicare (A+B) | Medicare Advantage (Part C) |
|---|---|---|
| Monthly premium | $185 (Part B only) | $0–$100+ (varies by plan) |
| Network restrictions | Any doctor who accepts Medicare | Usually limited to plan network (HMO) or preferred network (PPO) |
| Out-of-pocket cap | None — unlimited exposure | Max $9,350/year in-network (2025) |
| Referrals needed | No | Yes for HMO; usually no for PPO |
| Prior authorization | Rarely required | Commonly required for specialists, procedures, equipment |
| Extra benefits | None | Often dental, vision, hearing, fitness |
| Drug coverage | Separate Part D plan needed | Usually included (MAPD plan) |
| Coverage outside US | Very limited | Generally not covered |
| Medigap supplement | Can add Medigap | Cannot add Medigap |
Types of Medicare Advantage Plans
HMO (Health Maintenance Organization)
The most common MA plan type. You must use doctors, hospitals, and other providers in the plan's network (except for emergency care). You typically need a referral from your primary care doctor to see a specialist. HMO plans generally have the lowest premiums.
PPO (Preferred Provider Organization)
More flexible than HMO plans. You can see any doctor who accepts Medicare — inside or outside the network — but you pay less when you use in-network providers. No referrals required. PPO plans generally cost a bit more than HMOs.
PFFS (Private Fee-for-Service)
The plan sets its own payment terms for providers. You can see any Medicare-accepting provider who agrees to the plan's terms. Less common today than HMO and PPO plans.
SNP (Special Needs Plan)
Designed for people with specific conditions (chronic illness, dual-eligibility for Medicare and Medicaid, or institutional care needs). SNPs tailor benefits and drug formularies for their specific populations.
The Hidden Trade-Off: Prior Authorization
Prior authorization is rarely an issue in Original Medicare. The federal government does not require approval before you receive most services. This is the single largest practical difference between the two systems.
When Does Medicare Advantage Make Sense?
Medicare Advantage may be a good fit if you: are generally healthy and want extra benefits (dental, vision) at lower monthly cost; prefer an all-in-one plan; are comfortable staying in a network; and live in an area with strong MA plan options (typically urban and suburban areas).
Original Medicare plus Medigap may be better if you: travel frequently or split time between states; have complex medical needs requiring frequent specialist care; want the freedom to see any Medicare-accepting provider without network concerns; or want predictable, capped costs through a Medigap supplement.