At-A-Glance MHM provides behavioral health, medical and dental specialty services to governmental agencies in a wide variety of patient care settings, including correctional facilities, state hospitals, courts, juvenile facilities and community clinics. MHM Services and its subsidiaries serve clients in 16 states across the country. Real People. Real Results. MHM employs approximately 6,000 clinical, managerial, and administrative professionals nationwide. Our leadership team is the largest and most experienced staff of correctional mental health experts in the industry.