Most Medicare Advantage plans come in two flavors: HMO and PPO. The difference sounds technical but it affects how much you pay, which doctors you can see, and how much paperwork you deal with. Here is the breakdown in plain English.
The quick answer
An HMO has a smaller network of doctors and usually lower costs. A PPO has a bigger network and more flexibility but higher costs. HMOs require referrals to see specialists. PPOs do not.
For most healthy seniors who stay in one area, an HMO is fine. For people who travel a lot, see lots of specialists, or want more flexibility, a PPO is usually worth the extra cost.
What is a Medicare HMO?
HMO stands for Health Maintenance Organization. With a Medicare Advantage HMO plan:
- You have a contracted network of doctors, hospitals, and other providers
- You must use in-network providers (except for emergencies)
- You pick a primary care doctor (PCP) who coordinates your care
- You usually need a referral from your PCP to see a specialist
- Costs are usually lower (lower premiums, lower copays)
- Plans often include extras like dental, vision, and gym memberships
HMOs work like a tighter system. Your PCP is the gatekeeper. The trade-off for the lower cost is less flexibility.
What is a Medicare PPO?
PPO stands for Preferred Provider Organization. With a Medicare Advantage PPO plan:
- You have a preferred network of in-network providers
- You can see out-of-network providers, but at a higher cost
- You usually do NOT need to pick a primary care doctor
- You do NOT need referrals to see specialists
- Costs are usually higher (higher premiums, higher copays)
- More freedom to choose doctors and hospitals
PPOs work like looser insurance. You can see who you want, but in-network costs less.
Side by side
Network
- HMO: Must stay in network except for emergencies
- PPO: Can go out of network at higher cost
Referrals
- HMO: Yes, usually required to see specialists
- PPO: No referrals needed
Premium
- HMO: Often $0 or very low
- PPO: Usually $20 to $100 per month
Out-of-pocket maximum (MOOP)
- HMO: One MOOP for in-network care
- PPO: Two MOOPs (one in-network, one combined in-and-out-of-network)
Travel coverage
- HMO: Limited to emergency care outside the area
- PPO: Out-of-network coverage works nationwide
Doctor selection
- HMO: Must use in-network only
- PPO: Wider choice, including out-of-network
Prior authorization
- HMO: Often required for specialists, procedures, imaging
- PPO: Less frequent (but still happens)
What about HMO-POS?
POS stands for Point of Service. An HMO-POS is a hybrid. You have an HMO network, but you can go out of network for certain services with a referral.
HMO-POS plans are less common than regular HMOs or PPOs. They give you a little more flexibility than a pure HMO without the higher costs of a PPO.
How costs actually compare
Real example for a 67-year-old in a major metro area in 2026:
Typical HMO
- Premium: $0
- PCP copay: $0
- Specialist copay: $20-40 (with referral)
- ER copay: $90-120
- Hospital copay: $250-400/day for days 1-7
- Maximum out-of-pocket: $4,500-6,500
- Out-of-network: Not covered except emergencies
Typical PPO
- Premium: $30-80/month
- PCP copay: $0-15
- Specialist copay: $40-60 (no referral)
- ER copay: $90-120
- Hospital copay: $300-450/day for days 1-7
- Maximum out-of-pocket (in-network): $5,000-7,500
- Maximum out-of-pocket (combined): $8,000-12,000
- Out-of-network: 30-50% coinsurance after deductible
When to pick an HMO
HMOs make sense if:
- You live in one place year-round
- You don't travel internationally or live in multiple states
- Your current doctors are all in the plan's network
- You're comfortable with one primary care doctor coordinating your care
- You want the lowest possible monthly cost
- You don't see many specialists
When to pick a PPO
PPOs are usually better if:
- You travel often or live in two states (snowbird)
- You see multiple specialists across different health systems
- You want the freedom to pick any Medicare doctor
- You have a complex condition that needs out-of-area specialists
- You don't want to deal with referrals
- You can afford the higher premium
What about Medicare Supplement (Medigap)?
Original Medicare with a Medigap plan is a different path entirely. It works like an even more flexible PPO. Any doctor that takes Medicare is in network. No referrals. No prior authorization for most services. The trade-off is higher monthly premium.
For most people who travel frequently or want maximum flexibility, Medigap is the strongest choice. See our Medicare Advantage vs Medigap guide.
Common mistakes
Mistake 1: Picking the lowest-premium HMO without checking the network
A $0 premium HMO is no bargain if your favorite doctor is out of network. Always verify the network FIRST.
Mistake 2: Assuming PPO out-of-network is cheap
PPO out-of-network costs are real. A specialist visit out of network might be $150 instead of $50. A hospital stay out of network might be 50% coinsurance instead of a flat copay.
Mistake 3: Not noticing the two MOOPs on PPOs
PPOs have a lower MOOP for in-network and a higher combined MOOP. Out-of-network costs count toward the higher combined limit. People budget for the lower number and get caught.
Mistake 4: Switching to a PPO just for flexibility you'll never use
If you've seen the same doctors for 10 years and never travel, the PPO flexibility is wasted. An HMO with those doctors in network is the better fit.
The bottom line
HMOs trade flexibility for lower costs and tighter coordination. PPOs trade higher costs for the freedom to see any doctor. Neither is universally better. The right pick depends on your situation.
If you're not sure, an independent Medicare agent can show you both types side by side using your actual doctors and prescriptions. The answer is usually obvious once you see the comparison.
