Cal. Bus. & Prof. Code § 651.3

(a) Any labor organization, bona fide employee group or bona fide employee association having contracted health care services from a health care service plan under the Knox-Keene Health Care Service Plan Act of 1975 (commencing with Section 1340 of the Health and Safety Code) may inform its members as to the benefits available and the charges therefor.
(b) Any new or revised written advertising or solicitation, or any form of evidence of coverage adopted by a health care service plan under the Knox-Keene Health Care Service Plan Act of 1975 (commencing with Section 1340 of the Health and Safety Code) for distribution to members pursuant to subdivision (a) shall comply with the provisions of the Knox-Keene Health Care Service Plan Act of 1975 and the regulations thereunder.
(c) Any labor organization, bona fide employee group or bona fide employee association, contracting for a health care service plan under this section, shall not derive any profit from such plan.
Nothing contained in this section shall be construed as authorizing a provider of medical assistance, including a prepaid health plan, under the Medi-Cal Act or the Waxman-Duffy Prepaid Health Plan Act to advertise in violation of any of the provisions of such acts and regulations developed thereto.