HMO (Health Maintenance Organization)

An HMO is a collection of hospitals, doctors, and other health services all organized under one network. By managing care and contracting with the providers, HMOs keep costs down while providing a full range of health services. You usually pay only small co-pays when using services, no matter how many or what kind of services you use. In return, though, you must usually use the hospital(s), doctors, and other health providers in the HMO's network. In an HMO, you select a primary care physician. If you need a specialist, the primary care physician must first refer you to that specialist before you can see them.

HMOs in California are regulated by Department of Managed Health Care (DMHC).