The GI, or digestive, tract extends from mouth to anus (see the image below). The division of the GI tract into upper and lower is a matter of some confusion and debate.
Dental PPO insurance plans, also known as dental preferred provider organizations or DPPOs, are a popular dental insurance option due to their flexibility in allowing insured members to choose dentists and dental specialists.
Definitions for common health insurance terms. preferred provider organization (PPO) DEFINITION: A preferred provider organization (PPO) is a managed care organization of health providers who contract with an insurer or third-party administrator (TPA) to provide health insurance coverage to policy holders represented by the insurer or TPA.