Glossary
HMO (Health Maintenance Organization)
A plan network type where you choose a primary care physician (PCP), need referrals to see specialists, and are generally only covered in-network — except for emergencies.
Last updated: May 18, 2026
An HMO is one of the four major plan network types on the ACA Marketplace. The core idea: stay in a closed network, pick a Primary Care Physician (PCP), and let the PCP coordinate any care you need from specialists.
How an HMO works
- You pick a PCP from the plan’s network when you enroll. The PCP is your “front door” for medical care.
- For routine care (annual physicals, sick visits, basic labs), you go to your PCP.
- To see a specialist (cardiologist, dermatologist, orthopedist, etc.), you need a referral from your PCP. Without one, the plan usually does not cover the visit.
- Care from doctors and hospitals outside the network is not covered, except in true emergencies. There are exceptions for some preventive care or for areas with no in-network providers nearby.
What HMOs are good at
- Lower premiums than PPOs. Because the insurer negotiates harder with a smaller network of doctors, the premium and out-of-pocket costs are usually lower.
- Coordinated care. Having one PCP who knows your full picture often produces better continuity, especially for chronic conditions (diabetes, hypertension, asthma).
- Predictable costs. Copays are typically flat dollar amounts ($25 for PCP, $50 for specialist) instead of coinsurance percentages, so you know what you owe at the desk.
What HMOs are not good at
- Travel and out-of-state care. If you travel often or split time between two states, an HMO can mean every routine visit while away is out of pocket.
- Hand-picked specialists. If you already see a specialist (a particular surgeon, an out-of-area expert), the HMO probably will not cover them unless they happen to be in the network.
- Skipping the PCP. The referral requirement adds a step every time you need a specialist. Some patients find this friction worth the cost savings; others find it frustrating.
HMO vs PPO
| Feature | HMO | PPO |
|---|---|---|
| Premium | Lower | Higher |
| PCP required | Yes | Optional |
| Referrals to specialists | Required | Not required |
| Out-of-network coverage | Emergencies only | Yes, at higher cost |
| Best for | Predictable, in-network care | Flexibility, travel |
PPO is the opposite trade-off: more freedom, higher cost. EPO is a hybrid: no PCP or referrals, but still in-network only.
HMO and Hispanic communities
HMOs are common in markets with strong Hispanic-American populations (Florida, Texas, California) because major insurers like Florida Blue, Ambetter, and Molina lead with HMO products at low premium price points — often the cheapest path to a Silver plan with CSR for lower-income families. If your PCP and any specialists you already see are in the network, an HMO can be the best-value plan.
How to evaluate an HMO before enrolling
- Does the network include the doctor and hospital you actually use?
- Are there in-network specialists for any chronic conditions you have?
- Is the referral process the same network (online portal, phone) or paperwork?
- How does the plan handle out-of-area care if you travel?
A licensed agent can run the network lookup for any HMO plan in your county before you commit.