PPO (Preferred Provider Organization): A combination of traditional fee-for-service and an HMO. When you use the doctors and hospitals that are part of the PPO, you can have a larger part of your medical bills covered. You can use other doctors, but at a higher cost.
Preexisting Condition: A health problem that existed before the date your insurance became effective.
Premium: The amount you or your employer pays in exchange for insurance coverage.