An integrated delivery system (IDS) is a network of health care organizations under a parent holding company. Some IDS have an HMO component, while others are a network of physicians only, or of physicians and hospitals. Thus, the term is used broadly to define an organization that provides a continuum of health care services.[1] There is some discussion over the efficiency and sustainability of IDS.[2] Integrated delivery systems are one example of the emergence of managed care organizations in the United States.