(a) A 30-day waiting period may be implemented or extended under the following circumstances:
(1) After finding that the market is not competitive, under § 2603 of this title, the Commissioner may adopt a rule requiring that any subsequent changes in rates or supplementary information be filed with the Commissioner at least 30 days before they become effective.
(2) The Commissioner may extend the waiting period under this section for a period not exceeding 30 additional days by written notice to the filer before the first 30-day period expires.
(3) Upon written application by an insurer or advisory organization, the Commissioner may authorize a filing, which the Commissioner has reviewed, to become effective before the expiration of the period described in paragraph (a)(1) or (2) of this section.
(4) The filing shall be approved or disapproved during the waiting period and if not disapproved before the expiration of the waiting period shall be deemed to meet the requirements of this section.
(b) If a rule is adopted under subsection (a) of this section, the Commissioner may require the filing of supporting data as to classes of risks or combinations thereof as the Commissioner deems necessary for the proper functioning of the rate monitoring and regulating process. The supporting data shall include:
(1) The experience and judgment of the filer and, to the extent the filer wishes or the Commissioner requires, the experience and judgment of other insurers or the advisory organization;
(2) The filer's interpretation of any statistical data relied upon;
(3) A description of the actuarial and statistical methods employed in setting the rate; and
(4) Any other relevant matters required by the Commissioner.
(c) A rule adopted under this section shall expire not more than 1 year after issue. The Commissioner may renew it after hearings and appropriate findings under this section.
(d) Whenever a filing is not accompanied by the information as the Commissioner has required under subsection (b) of this section, the Commissioner shall so inform the insurer within 10 days of the initial filing. The filing shall be deemed to be made when the required information is furnished.