Which network requires the patient's primary care physician to be a member, with partial reimbursement for costs outside the network?

The correct answer is a type of health insurance plan known as a Point of Service (POS) plan. This plan combines features of both Health Maintenance Organizations (HMOs) and Preferred Provider Organizations (PPOs). In a POS plan, patients are typically required to select a primary care physician (PCP) who must be a member of the network. This PCP coordinates the patient's care and provides referrals to specialists within the network.

One of the key features of a POS plan is that while patients are encouraged to receive care from network providers, they do have the option to seek care outside of the network. However, if they choose to do so, the reimbursement for services received outside the network is often partial, requiring the patient to pay higher out-of-pocket costs.

This structure is beneficial for patients who prefer having a primary care physician to manage their healthcare while still having the flexibility to see specialists outside of the network if needed, albeit at a higher cost. The requirement of a primary care physician helps maintain coordinated care, making a POS plan appealing for those who prioritize access to a central point of healthcare management.