California Code, Welfare and Institutions Code - WIC § 16519.65

(a) For matters set before the State Hearings Division, the county or respondent may file a request with the department for a rehearing within 30 days after receiving the decision of the department that is a proposed decision of an administrative law judge adopted by the department as a final decision and order, a final decision rendered by an administrative law judge, or a decision issued by the department. The department shall grant or deny the request no later than the 90th business day after the request is made. The remaining provisions of Section 10960 shall apply to the rehearing request.

(b) If the department grants the request, the rehearing shall be conducted in accordance with Section 16519.6 and following.