Medical Medical Reference Centers for Medicare and Medicaid Services Information, publications, and data and statistics on a wide variety of health and safety Health information for the whole family, from the American Academy of Family Physicians. National Institutes of Health's Web site for patients and their families. Leading scientific and professional organization representing psychology in the United States The National Institute of Mental Health (NIMH) is the lead federal agency for research on mental disorders. Organization of psychiatrists working together to ensure effective treatment for all persons with mental illness, including substance use disorders.