After you enroll in an HMO, you typically will need to select a primary care physician who will be responsible for coordinating all of your care. Primary care physicians may be family practice doctors, internists, pediatricians, obstetricians-gynecologists, or general practitioners.
If you become ill, your primary care doctor will see you first, unless it is an emergency. Your primary care doctor will give you a referral if he or she thinks you need to see a specialist. Usually, your HMO will not provide coverage for a specialist unless you have this referral.