The superintendent shall issue an order or decision within 30 days after the close of the hearing, or of any rehearing or reargument or within such other period as the superintendent for good cause may require, but not to exceed an additional 30 days. In the order or decision, the superintendent shall either approve or disapprove the rate filing. If the superintendent disapproves the rate filing, the superintendent shall establish the date on which the filing is no longer effective, specify the filing the superintendent would approve and authorize the insurer to submit a new filing in accordance with the terms of the order or decision. [PL 1989, c. 269, §14 (AMD).]