Cal. Bus. & Prof. Code § 511.4
(a) A contracting agent, as defined in paragraph (2) of subdivision (d) of Section 511.1, shall beginning July 1, 2006, prior to contracting, annually thereafter on or before the contract anniversary date, and, in addition, upon the contracted provider’s written request, disclose to contracting providers all of the following information in an electronic format:
(2) The detailed payment policies and rules and nonstandard coding methodologies used to adjudicate claims, which shall, unless otherwise prohibited by state law, do all of the following:
(C) At a minimum, clearly and accurately state the policies regarding all of the following: