### Question
What is the definition of dual diagnosis?


### Answer
The definition of **dual diagnosis** is as follows in *25 U.S.C. § 1665*:

> 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**

