Government Code § 854.4
CHAPTER 5. Medical, Hospital and Public Health Activities
As used in this chapter, “mental illness or addiction” means any condition for which a person may be detained, cared for, or treated in a mental institution, in a facility designated by a county pursuant to Chapter 2 (commencing with Section 5150) of Part 1 of Division 5 of the Welfare and Institutions Code, or in a similar facility.