(a) It shall be the duty of the commissioner to enforce the provisions of this article. If the commissioner finds that a corporation is impaired, he may issue such orders and otherwise require that the corporation take all actions that in his judgment are necessary for the corporation to cure the impairment. Failure of the corporation to follow such orders and directions is evidence that the management is incompetent and grounds for an order of rehabilitation or liquidation, as the commissioner deems appropriate.

(b) No such corporation shall deliver or issue for delivery any subscriber's contract, changes in the terms of such contract, application, rider or endorsement, until a copy thereof and the rates pertaining thereto have been filed with and approved by the commissioner. All such forms filed with the commissioner shall be deemed approved after the expiration of sixty days from the date of such filing unless the commissioner shall have disapproved the same, stating his reasons for such disapproval in writing. Such forms may be used prior to the expiration of such periods if written approval thereof has been received from the commissioner.

(c) No rates to be charged subscribers shall be used or established by any such corporation unless and until the same have been filed with the commissioner and approved by him The procedure for such filing and approval shall be the same as that prescribed in subsection (b) of this section for the approval of forms. The commissioner shall approve all such rates which are not excessive, inadequate or unfairly discriminatory.

(d) The commissioner shall pass upon the actuarial soundness of the schedule of fees to be paid hospitals, physicians, dentists and other health agencies.