Preferred provider organization
In health insurance in the United States, a preferred provider organization (PPO), sometimes referred to as a participating provider organization or preferred provider option, is a managed care organization of medical doctors, hospitals, and other health care providers who have agreed with an insurer or a third-party administrator to provide health care at reduced rates to the insurer's or administrator's clients.
Ministries of the Soviet Union
Finally, in what is known as dual subordination, the staff of each ministry was required to respond to orders and directions from its primary party organization (PPO), as well as to the ministries' hierarchy. Party members on the staff of the ministry were bound by the norms of democratic centralism to obey the orders of the secretary of the PPO, who represented the CPSU hierarchy in the ministry. The secretary of the PPO ensured that CPSU policies were carried out in the day-to-day activities of the ministries.