California Code, Welfare and Institutions Code - WIC § 14105.25

(a) Notwithstanding any other provision of law, to the extent permitted by federal law and regulations, the maximum rate of reimbursement under the Medi-Cal program for any service or item that is a benefit under Part B of the Medicare program, excluding physician and diagnostic clinical laboratory services, shall not exceed the lowest maximum allowance established by the federal Medicare program for that service or item in any area of the state.

(b) The director shall reduce the rate of reimbursement for any service or item, as required, to comply with subdivision (a).

(c) The director shall administer this section and establish standards, procedures, and rates of reimbursement, as the director deems necessary in carrying out this section. Reimbursement rates are not required to be adopted as regulations pursuant to the Administrative Procedure Act (Chapter 3.5 (commencing with Section 11340) of Part 1 of Division 3 of Title 2 of the Government Code).