Modification of Awards

Upon his own initiative, or upon the application of any party in interest, on the ground of a change in conditions or because of a mistake in a determination of fact by the Commissioner, the Commissioner may, at any time prior to one

(1)year after the date of the last payment of compensation, whether or not a compensation order has been issued, or at any time prior to one

(1)year after the rejection of a claim, review a compensation case in accordance with the procedure prescribed in respect of claims in § 9120, and in accordance with such section issue a new compensation order which may terminate, continue, reinstate, increase, or decrease such compensation, or award compensation. Such new order shall not affect any compensation previously paid, except that an award increasing the compensation rate may be made effective from the date of the injury; and if any part of the compensation due or to become due is unpaid, an award decreasing the compensation rate may be made effective from the date of the injury, and any payment made prior to the time of the award in excess of such decreased rate shall be deducted from any unpaid compensation in such manner and by such method as may be determined by the Commissioner with the approval of the Commission.