California Code, Welfare and Institutions Code - WIC § 14024

When health care services are provided to a person under this chapter who at the time the service is provided has any other contractual or legal entitlement to such services, the director shall have the right to recover from the person, corporation, or partnership who owes such entitlement, the amount which would have been paid to the person entitled thereto, or to a third party in his behalf, or the value of the service actually provided, if the person entitled thereto was entitled to services. The Attorney General may, to recover under this section, institute and prosecute legal proceedings against the person, corporation, or partnership owing such entitlement in the appropriate court in the name of the director.

To the extent permitted by federal law and subject to the director's prior right to recover upon any contractual or legal entitlement or other third-party liability for the cost incurred in rendering care, the provider of services shall remain entitled to recover remaining unpaid charges to the extent that any third party is obligated to pay the charges by reason of the beneficiary's other contractual entitlement. Any claim shall not be permitted to the extent that the claim would reduce the director's right to recover pursuant to Section 14124.78.

The provider of services shall be required to notify the department of any potential contractual or legal entitlement or other third-party liability within 60 days of discovery. A provider who has obtained proof of Medi-Cal eligibility and who makes a claim for payment by any third party shall disclose in the claim that the patient is a Medi-Cal beneficiary.