A group practice without walls a. is owned by the hospital(s) and physician groups and allows physicians to maintain their own practices and provide health care services to plan members. b. manages the delivery of health care services offered by hospitals, physicians (who are employees of the IPO), and other health care organizations. c. provides practice management (administrative and support) services to individual physician practices. d. establishes a contract that allows physicians to maintain their own offices and share services.​