(a) Whenever the commissioner shall have reason to believe that any person engaged in the business of insurance is engaging in this state in any method of competition or in any act or practice in the conduct of the business that is not defined in Section 790.03, and that the method is unfair or that the act or practice is unfair or deceptive and that a proceeding by him or her in respect thereto would be in the interest of the public, he or she may issue and serve upon that person an order to show cause containing a statement of the methods, acts or practices alleged to be unfair or deceptive and a notice of hearing thereon to be held at a time and place fixed therein, which shall not be less than 30 days after the service thereof, for the purpose of determining whether the alleged methods, acts or practices or any of them should be declared to be unfair or deceptive within the meaning of this article. The order shall specify the reason why the method of competition is alleged to be unfair or the act or practice is alleged to be unfair or deceptive. The hearings provided by this section shall be conducted in accordance with the Administrative Procedure Act (Chapter 5 (commencing with Section 11500) of Part 1 of Division 3 of Title 2 of the Government Code), except that the hearings may be conducted by an administrative law judge in the administrative law bureau when the proceedings involve a common question of law or fact with another proceeding arising under other Insurance Code sections that may be conducted by administrative law bureau administrative law judges. The commissioner and the appointed administrative law judge shall have all the powers granted under the Administrative Procedure Act. If the alleged methods, acts, or practices or any of them are found to be unfair or deceptive within the meaning of this article the commissioner shall issue and service upon that person his or her written report so declaring.