Md. Code, Insurance § 11–219

(a) An insurer may deviate from the rates filed by a rating organization if:

(1) the insurer has filed the deviation to be applied with the rating organization and Commissioner;

(2) 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

(3) the deviation is approved by the Commissioner.

(b) 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.