A network model HMO is one in which contracted health care services are provided by which of the following?

In a network model Health Maintenance Organization (HMO), contracted health care services are often delivered through two or more physician multispecialty group practices. This model allows the HMO to create a larger network of providers, offering a wider selection of services and specialties to its members while controlling costs and maintaining quality of care.

By establishing relationships with multiple group practices, the HMO can provide comprehensive care through coordinated services that include preventive, acute, and specialty care. This structure also facilitates better patient management and the sharing of resources among various specialties, which can improve health outcomes and patient satisfaction.

The other options suggest narrower or different types of provider arrangements that do not fully encapsulate the essence of a network model HMO. For instance, participating physicians in an independent multispecialty group practice or individual physicians may not reflect the integrated approach of multiple group practices. Similarly, physicians employed directly by the HMO imply a more closed system rather than the collaborative nature of a network. Therefore, the choice aligned with two or more physician multispecialty group practices accurately reflects the operational model of a network model HMO.