Ind. Code § 27-13-2-7

Sec. 7. Any modification or amendment requiring the approval of the commissioner under rules adopted under section 6 of this chapter is considered approved unless the commissioner disapproves the modification or amendment not more than thirty (30) days after the modification or amendment is submitted. However, the commissioner may postpone the action, if necessary for proper consideration, and if the commissioner gives written notice of the postponement to the applicant before the expiration of the thirty (30) day period.