Dr. Julia Green is a primary care physician (PCP) licensed to practice medicine in the Commonwealth of Massachusetts. On October 1, 1994, Dr. Green signed a one-year, renewable contract with Allcare Health Plan (AHP). Pursuant to the terms of the contract, on January 1, 1995, AHP placed her on its select list of PCPs available to its 100,000 covered lives (“enrollees”). Dr. Green provided for all primary care and specialist referrals for those enrollees who chose her as their physician. AHP paid her on a fee-for-service (FFS) basis for all preapproved procedures and treatments.Dr. Green felt that this contract might decrease her autonomy slightly; however, she also felt that it would increase her patient pool significantly and lessen the burden of collecting fees directly from patients. Dr. Green knew that choosing not to sign the contract would preclude AHP enrollees from making her their PCP because AHP only covered treatment provided by its own physicians. She further feared that as enrollment in managed care organizations (MCOs) increases, and more of her colleagues sign managed care contracts, her pool of potential patients would decrease drastically.