### Question
How does the law define special populations?


### Answer
Under *42 U.S.C. § 290bb*, **special populations** is defined as:

> adults with mental illnesses who have co-occurring primary care conditions and chronic diseases

#### Citation:
  - *42 U.S.C. § 290bb*
  - Heading: **CHAPTER 6A-PUBLIC HEALTH SERVICE > SUBCHAPTER III&ndash;A-SUBSTANCE ABUSE AND MENTAL HEALTH SERVICES ADMINISTRATION > Part B-Centers and Programs > subpart 3-center for mental health services**

