Mass. Gen. Laws ch. 231, § 6H: Interest on damages

Section 6H. In any action in which damages are awarded, but in which interest on said damages is not otherwise provided by law, there shall be added by the clerk of court to the amount of damages interest thereon at the rate provided by section six B to be determined from the date of commencement of the action even though such interest brings the amount of the verdict or finding beyond the maximum liability imposed by law.