Cal. WIC § 6006

A person admitted as a voluntary patient to a state hospital, a private mental institution, or a county psychiatric hospital shall have the following rights in addition to the right to leave such hospital as specified in this chapter: (a) He shall receive such care and treatment as his condition requires for the full period that he is a patient; (b) He shall have the full patient rights specified in Article 7 (commencing with Section 5325) of Chapter 2 of Part 1 of Division 5 of this code.