An insurer may deviate from the rates filed by a rating organization if: the insurer has filed the deviation to be applied with the rating organization and Commissioner; the deviation is uniform in its application to all risks in the State of the class of insurance to which the deviation is to apply; and the deviation is approved by the Commissioner. The Commissioner may approve or disapprove a deviation as if the deviation filing were a rate filing and specify the period of time during which an approval will be effective.