In-network: Providers or health care facilities which are part of a health plan’s network of providers with which it has negotiated a discount. Insured individuals usually pay less when using an in-network provider, because those networks provide services at lower cost to the insurance companies with which they have contracts. 

Network: A group of doctors, hospitals and other health care providers contracted to provide services to insurance company’s customers for less than their usual fees. Provider networks can cover a large geographic market or a wide range of health care services. Insured individuals typically pay less for using a network provider. 

Out-of-Network: This phrase usually refers to physicians, hospitals or other health care providers who are considered non-contracted participants in an insurance plan (usually an HMO or PPO). Depending on an individual’s health insurance plan, expenses incurred by services provided by out-of-plan health professionals may not be covered, or covered only in part by an individual’s insurance company.