If the enrolled employer elects to change coverage from one participating carrier to a different participating carrier at the time of policy renewal and premium subsidy renewal, the enrolled employer shall identify the new carrier in the renewal application. If the enrolled employer elects to change coverage from one participating carrier to a different participating carrier at any time other than the time of policy renewal and premium subsidy renewal, the enrolled employer shall notify the Commission at least 30 days in advance of the change and shall complete the renewal application specified under Regulation .09 of the chapter for the new health benefit plan.