Ins. Code, § 11753.1

(a) Any person aggrieved by any decision, action, or omission to act of a rating organization may request that the rating organization reconsider the decision, action, or omission. If the request for reconsideration is rejected or is not acted upon within 30 days by the rating organization, the person requesting reconsideration may, within a reasonable time, appeal from the decision, action, or omission of the rating organization. The appeal shall be made to the commissioner by filing a written complaint and request for a hearing specifying the grounds relied upon. If the commissioner has information on the subject appealed from and believes that probable cause for the appeal does not exist or that the appeal is not made in good faith, the commissioner may deny the appeal without a hearing. The commissioner shall otherwise hold a hearing to consider and determine the matter presented by the appeal.

(b) Any insurer adopting a change in the classification assignment of an employer that results in an increased premium shall notify the employer in writing, or if the insurance was transacted through an insurance agent or broker, the insurer shall notify the agent or broker who shall notify the employer in writing of the change and the reasons for the change. Any employer receiving this notice shall have the right to request reconsideration and appeal the reclassification pursuant to this section. The notice required by this section shall inform the employer of his or her rights pursuant to this section. No notification shall be required when the change is a result of a regulation adopted by the Department of Insurance or other action by or under the authority of the commissioner.

An insurer shall provide written notification of the revised classification assignment to an employer within 30 days after adoption.