Cal. Welfare and Institutions Code § 14088.17

(a) The department may contract under this article, on an exclusive or nonexclusive basis, with an established professional organization with a membership which consists of physicians who engage in the types of practices or who provide services in the locations set forth in subdivision (a) of Section 14088. (b) (1) A contract under this section shall be implemented in a manner consistent with any federal waivers which are obtained by the department to enable such an arrangement. (2) Where federal waivers permit restrictions on beneficiary freedom of choice, the contract shall provide covered Medi-Cal beneficiaries with an initial choice of a primary care physician and a procedure through which a beneficiary may change primary care physicians with good cause. (c) This section shall apply only to the provision of services to beneficiaries who, for purposes of Medi-Cal eligibility determination, are residents of Lake County, Mendocino County, or Sonoma County.