Chestnut Health Systems™ is a private, not-for-profit 501(c)(3) charitable organization governed by a volunteer Board of Directors. Chestnut offers a comprehensive scope of behavioral health and human services in Illinois and Missouri. Our professional and experienced staff is committed to providing high-quality care and services to the communities we serve. From drug and alcohol addiction 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: Substance use treatment and prevention Mental health treatment and housing for persons with mental illness Applied behavioral research, training, and publications Primary care treatment and preventative services Chestnut has been continuously accredited by The Joint Commission since 1975.
