Chestnut Health Systems (CHS) is a behavioral healthcare service organization, engaged in providing healthcare programs and services with focuses to rebuild lives and restoring families. It is focused in the development and delivery of superior human services. The organization is specialized in providing behavioral healthcare in Illinois. It offers a wide range of services including, services for the chronic mentally ill, chemical dependency treatment for adults and adolescents, credit counseling, problem gambling services and counseling and mental health services. Furthermore, it also offers special programs and projects. CHS has been Accredited by the Joint Commission on Accreditation of Healthcare Organizations (JCAHO) for many years. It provides services in Central Illinois and in Southwest Illinois. CHS is headquartered at Bloomington in Illinois the US.