28 Tex. Admin. Code § 3.5602
A request for an approved deviated rate must be made in writing and must include all of the information which is required under this subchapter. It must be accompanied by a list of the creditors whose experience is the basis for such request, and must be attested to by an officer of the insurer. The use of any approved rate deviation approved by the commissioner is limited to those creditors whose names appear on such list. No rate deviation may be used unless and until approved by the commissioner in writing. Any request for an approved deviated rate must be submitted to the commissioner through the Filings Intake Division in the manner prescribed on Form CI-DRF provided by the department for that purpose. The form can be obtained from the Texas Department of Insurance, Life and Health Division, Filings Intake, MC-LH-LHL, P.O. Box 12030, Austin, Texas 78711-2030. The form can also be obtained from the department's internet website at www.tdi.texas.gov/forms. In order to provide the commissioner sufficient time for review, all requests for approved rate deviations must be submitted a minimum of 60 days prior to the proposed effective date of the approved deviated rate.
28 Tex. Admin. Code § 3.5602