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. 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.