(a) A prior approval filing shall be made not less than 30 days before the effective date. At the end of the 30-day period, the form filed shall be considered approved unless, before the end of the 30-day period, it has been affirmatively disapproved by the director. Approval of the form by the director before the end of the 30-day period constitutes a waiver of the unexpired portion of the waiting period. The director may extend by not more than an additional 30 days the period for approving or disapproving the form, by giving notice of the extension during the initial 30-day period. At the expiration of the extended period, and in the absence of a prior approval or disapproval, the form shall be considered approved. The director may, by order, at any time after the notice, and for cause shown, withdraw the approval.

(b) The director may require the insurer or rating organization to revise the filing to comply with this title. Failure of the insurer or rating organization to provide the information within 30 days after the director's request, or an extension of the period by the director for an additional 15 days upon written request of the insurer or rating organization within the response period, is considered to be a request by the insurer or rating organization to withdraw the filing from further consideration.

(c) The filing must state an effective date. In place of a specific date, the insurer or rating organization may specify a reasonable time period after approval for the filing to be effective.

(d) A prior approval filing shall be open to public inspection after the filing becomes effective.