The New York State Office of Mental Health (OMH) operates the largest state mental health system in the country, with 22 hospitals, 90 clinics, two world class research institutes and community services. OMH hospitals are all Joint Commission accredited and recognized as among the best mental health hospital systems in the United States. Patients stay as long as needed, treatment is comprehensive, recovery oriented, and all services are built on principles of effective, measurable, and accountable care.