Except as otherwise provided in this regulation, a carrier shall render a final decision on a grievance that involves a: Prospective denial in a nonemergency case within 30 working days after the filing date; and Retrospective denial within 45 working days after the filing date. With the written consent of the member, member’s representative, or health care provider who filed a grievance on behalf of the member, a carrier may extend the period for making a final decision for an additional period of not longer than 30 working days.