Cal. Health & Safety Code § 127673.05
(b) Notwithstanding any other state law, for the purpose of providing information for inclusion in the system, PBMs shall provide to the department data regarding drug pricing, the fees paid for pharmacy benefit management services, payments or rebates to or from pharmacy benefits managers regarding drugs or services, and other information as needed to provide transparency on pricing and payments related to prescription drugs. This may include all of the following:
(13) Information needed to calculate any of the following: