Final answer:
In the group practice model, physicians are employed by the group practice itself.
Step-by-step explanation:
In the group practice model, physicians are employed by the group practice itself.
A group practice is a healthcare organization where multiple physicians work together to provide medical services to patients. They may share resources, such as facilities and staff, and collaborate on patient care.
Other entities mentioned in the question, such as HMOs, IPAs, and PPOs, may contract with group practices to provide healthcare services, but the physicians themselves are typically employed by the group practice.