### Question
How is the term dual diagnosis defined?


### Answer
The term **dual diagnosis** is defined in *25 U.S.C. § 1665* as the following:

> coexisting substance abuse and mental illness conditions or diagnosis

#### Citation:
  - *25 U.S.C. § 1665*
  - Heading: **CHAPTER 18-INDIAN HEALTH CARE > SUBCHAPTER V&ndash;A-BEHAVIORAL HEALTH PROGRAMS > Part A-General Programs**

