Md. Code, Courts and Judicial Proceedings § 3–209

(a) A court shall stay any action or proceeding involving an issue subject to arbitration if:

(1) A petition for order to arbitrate has been filed; or

(2) An order for arbitration has been made.

(b) If the issue subject to arbitration is severable, the court may order the stay with respect to this issue only.

(c) If a petition to stay has been filed with a court where any action or proceeding concerning arbitration is pending, the court’s order to arbitrate shall include the stay.