Chestnut Health Systems is a not-for-profit organization that has cared since 1973 for the most vulnerable in our communities. They offer a comprehensive scope of behavioral health and human services in Illinois and Missouri. The professional and experienced staff is committed to providing high-quality care and services to the communities we serve. From substance use treatment facilities (residential and outpatient) to primary care medical homes, to a research institute, Chestnut continuously works to achieve its mission to make a difference and improve quality of life through excellence in service.

Chestnut is comprised of the following four core service areas:

• Applied behavioral research, training, and publications (Lighthouse Institute)
• Mental health treatment and housing for persons with mental illness
• Primary care treatment and preventative services
• Substance use treatment and prevention

Chestnut has been continuously accredited by The Joint Commission since 1975. Learn more at www.chestnut.org.