Operational since 1957, Frontier Health is one of the largest health services providers in the United States. The organization provides an array of services, such as behavioral health, mental health, substance abuse, co-occurring, intellectual, developmental disabilities and vocational rehabilitation services. It operates more than 85 programs in two states. Frontier Health has been serving the Northeast Tennessee and Southwest Virginia region. The organization also provides services that include treatment for family violence, mental illness, mental retardation, dual diagnosis and substance abuse for children, adolescents, adults, aging adults and families.