Final answer:
The organization known for contracting with physicians to provide services at a fixed fee is the Independent Practice Association (IPA) Model. Among the options given, the Network Model may be the closest, as it involves contracts with multiple groups, but it does not precisely match the question's description.
Step-by-step explanation:
In this model of Health Maintenance Organizations (HMOs), the HMO contracts with physicians to provide services at a set fee. The organization that operates by contracting with a physician to provide service at a set fee is known as the Independent Practice Association (IPA) Model, which is not explicitly listed in the provided options. Therefore, the correct answer to the fill-in-the-blank question would depend on the specific options given in the course material. Among the listed options, Network Model is somewhat similar as it involves contracts with multiple physician groups or individual physicians. However, this does not precisely match the description given in the question. HMO models can include the Staff Model, where physicians are salaried employees of the HMO, the Group Model, where the HMO contracts with a single multi-specialty medical group, and the Network Model, which contracts with more than one medical group. The Independent Model is not a recognized term in standard HMO configurations.