Cal. WIC § 4659.21

Notwithstanding any other provision of law, all carriers described in Section 14124.70, including automobile, casualty, property, and malpractice insurers, shall enter into agreements with regional centers and the department to permit and assist the matching of the eligibility files of the department and the regional centers against the carrier’s claim files, utilizing, if necessary, social security numbers as common identifiers for the purpose of determining whether services were provided to a child eligible for the California Early Intervention Program or consumer because of an injury for which another person is liable, or for which a carrier is liable in accordance with the provisions of any policy of insurance. The carrier shall maintain a centralized file of claimants’ names, mailing addresses, and social security numbers or dates of birth. This information shall be made available to the department and the regional center upon a reasonable request by the department or a regional center. The agreement described in this section shall include financial arrangements for reimbursing carriers for necessary costs incurred in furnishing requested information.