Maryland Code, Labor and Employment § 9-664

(a)(1) If the Commission finds that the employer or its insurer has failed, without good cause, to pay for treatment or services required by § 9-660 of this Part IX of this subtitle within 45 days after the Commission, by order, finally approves the fee or charge for the treatment or services, the Commission may impose a fine on the employer or insurer, not exceeding 20% of the amount of the approved fee or charge.

(2) The employer or insurer shall pay the fine to the Commission to be deposited in the General Fund of the State.

(b)(1) Interest, payable to the provider of the treatment or services, shall accrue at the rate specified in § 11-107(a) of the Courts Article on any amount owed to the provider that:

(2) Interest shall accrue beginning on the 46th day after the later of: