Which term refers to a combination of traditional free-for-service and health maintenance organization?

The term that refers to a combination of traditional fee-for-service and health maintenance organization is "Preferred Provider Organization" (PPO). PPOs allow members to receive care from a network of preferred providers at reduced costs while still offering the flexibility to see out-of-network providers, albeit at a higher out-of-pocket expense. This hybrid model aims to balance cost control with patient choice in healthcare services.