Cal. Bus. & Prof. Code § 650.01
(b) For purposes of this section and Section 650.02, the following shall apply:
(4) “Licensee” means all of the following:
(5) “Licensee’s office” means either of the following:
(6) “Office of a group practice” means an office or offices in which two or more licensees are legally organized as a partnership, professional corporation, or not-for-profit corporation, licensed pursuant to subdivision (a) of Section 1204 of the Health and Safety Code, for which all of the following apply:
(f) A licensee who refers a person to, or seeks consultation from, an organization in which the licensee has a financial interest, other than as prohibited by subdivision (a), shall disclose the financial interest to the patient, or the parent or legal guardian of the patient, in writing, at the time of the referral or request for consultation.