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Home About Us News Members File Library Contact Us The Massachusetts Association of Behavioral Health Systems MABHS is the only trade association in Massachusetts whose central mission is to focus on inpatient psychiatric and substance abuse issues. Originally founded in 1989 by the freestanding psychiatric hospitals the MABHS has grown over the years and now consists of 50 inpatient facilities statewide from the Berkshires to Cape Cod. Its member facilities have over 2500 beds and admit over 60000 patients on an annual basis. The facilities consist of Freestanding Hospitals General Hospital psychiatric units and Substance Use Disorder facilities throughout Massachusetts.