Because of the changing health care climate in the U.S., the majority of psychiatric services now come from organized entities. They include behavioral health carve-out companies that handle commercial as well as public-sector benefits; state systems, such as state departments of mental health, and federal systems, such as the health services system of the Department of Veterans Affairs, that treat seriously mentally ill populations; and organized nongovernmental delivery systems, some owned and operated by physicians. Several models for organizing physician-owned and -operated systems have been developed, including physician-hospital organizations, physician-sponsored organizations, individual practice associations, foundations, medical service organizations, integrated delivery systems, and group practices that assume financial risk for treatment.