Explain the three main types of managed care arrangements that have proliferated in the United States.

What will be an ideal response?

An HMO is a prepaid, organized system for providing comprehensive health care services within a geographic area to all persons under contract, emphasizing preventive medicine. An IPA is a community-based group of independent practitioners who contract to provide care for prepaid, enrolled individuals. A PPO consists of a network of participating hospitals, physicians, medical groups, and other providers who contract with a sponsor, such as an insurance company or employer, to provide services to those enrolled in the PPO.