An insurer desiring to use the alternate procedure specified in Regulation .04 of this chapter may elect the procedure for: All groups; or Groups in excess of a certain size. An insurer shall notify the Insurance Commissioner of its election under this regulation and Regulation .04 of this chapter within 90 days of the effective date of this chapter. An insurer that follows the procedures set forth in Regulation .03 of this chapter, or that elects to comply with the procedures set forth in this regulation and Regulation .04 of this chapter, may change its procedures only after approval by the Commissioner.