Which of the following is described when a selected group of practitioners, in a certain area, agrees to provide services at a pre-arranged cost on a fee-for-service basis?

An indemnity plan, also known as a fee-for-service plan, allows individuals to choose their healthcare providers and pays for services after treatment. Unlike the described scenario, indemnity plans do not involve pre-arranged costs or agreements with specific practitioner groups.

Health Maintenance Organizations (HMOs) typically require patients to select a primary care physician and obtain referrals for specialty care within the network. The described model of practitioners agreeing to set fees for services without the need for primary care physician involvement aligns more closely with a PPO rather than an HMO.

Point of Service (POS) plans combine features of HMOs and PPOs, allowing patients to choose between in-network and out-of-network care. While POS plans offer flexibility, the concept of a selected group of practitioners agreeing to provide services at pre-arranged costs aligns more with a PPO structure.