California Code, Health and Safety Code - HSC § 1347.5

(a) A health care service plan providing individual coverage in the Exchange shall cooperate with requests from the Exchange to collaborate in the development of, and participate in the implementation of, the Medi-Cal program's premium and cost-sharing payments under Sections 14102 and 14148.65 of the Welfare and Institutions Code for eligible Exchange enrollees.

(b) A health care service plan providing individual coverage in the Exchange shall not charge, bill, ask, or require an enrollee receiving benefits under Section 14102 or 14148.65 of the Welfare and Institutions Code to make any premium or cost-sharing payments for any services that are subject to premium or cost-sharing payments by the State Department of Health Care Services under Section 14102 or 14148.65 of the Welfare and Institutions Code.

(c) For purposes of this section, “Exchange” means the California Health Benefit Exchange established pursuant to Title 22 (commencing with Section 100500) of the Government Code.