What is the function of a "health maintenance organization" (HMO)?

A health maintenance organization (HMO) serves a specific role within the healthcare system by offering health insurance through a structured network of providers. Members of an HMO are required to obtain their medical services primarily from this network, which can include family physicians, specialists, and hospitals that have agreed to provide services at reduced costs. This model often emphasizes preventative care, as HMOs typically encourage members to engage in regular check-ups and screenings in order to maintain overall health and prevent more serious health issues.

This focus on a managed care approach helps the organization control costs while providing access to essential healthcare services. The use of a network can also lead to streamlined care and coordination among providers, which benefits members through improved health outcomes and reduced out-of-pocket expenses for covered services.

The other options do not accurately capture the primary function of an HMO. Providing a variety of insurance plans across multiple providers, guaranteeing payment for out-of-network services, or serving as a regulatory body are not consistent with the HMO model, which is centered on coordinated care within a specific network of providers.