Final answer:
The principal goal of a Preferred Provider Organization (PPO) is not to provide medical services only from physicians in the network, but to offer reduced costs and a choice of physicians and hospitals, with the flexibility to use out-of-network providers.
Step-by-step explanation:
The principal goal of a Preferred Provider Organization (PPO) is to provide medical services at a reduced cost to the subscriber while also offering a choice of physicians and hospitals.
Unlike Health Maintenance Organizations (HMOs), PPOs allow for some flexibility to see providers outside of the network, although at a higher cost. Thus, the correct answer to which does NOT describe the principal goal of a PPO is: B Provide medical services only from physicians in the network, as PPOs do allow services from out-of-network providers, albeit with potentially higher out-of-pocket costs for the subscriber.