HMO Definition | OnlineHealthIns.com Glossary

HMO (Health Maintenance Organization)

Also known as: Health Maintenance Organization

A health plan that covers care mainly through a network of contracted providers and usually requires you to pick a primary care physician and get referrals to see specialists.

An HMO (Health Maintenance Organization) is a type of health plan built around a defined network of doctors, hospitals, and other providers. In exchange for lower premiums and predictable costs, you generally agree to get your care within that network and to coordinate it through a primary care physician (PCP).

You choose or are assigned a PCP who manages your routine care.
To see a specialist, you typically need a referral from your PCP first.
Care from out-of-network providers usually isn't covered except in emergencies.

HMOs tend to have lower premiums and out-of-pocket costs than PPOs because the plan can negotiate better rates by directing members to a smaller, tightly managed network. The tradeoff is less flexibility: if your preferred doctor isn't in the network, switching to an HMO usually means switching doctors too.

A common misconception is that HMOs never cover out-of-network care at all. Most will still cover true emergencies regardless of network, but routine or non-emergency care outside the network is typically your full responsibility.

Example

A member enrolled in an HMO sees their assigned primary care physician for a persistent cough, and the PCP refers them to an in-network pulmonologist for further testing.

Good to Know

If you move or travel frequently, an HMO's network restrictions can make it harder to get routine, non-emergency care away from home.

Related Terms

PPO (Preferred Provider Organization) — A health plan that gives you a network of preferred providers for the lowest cost, but still lets you see out-of-network providers and specialists without a referral.

EPO (Exclusive Provider Organization) — A health plan that only covers care from its network, like an HMO, but typically doesn't require referrals to see a specialist.

Network (In-Network / Out-of-Network) — The group of doctors, hospitals, and other providers that have agreed to accept a health plan's negotiated rates; using providers outside that group usually costs more.

Premium — The amount you pay, usually monthly, just to keep your health insurance coverage active, regardless of whether you use any care.