77 Pa. Stat. § 1419
Where the compensable disability is caused in whole or in part by the act or omission of a third party, the employer shall be subrogated to the right of the employe, his personal representative, his estate or his dependents, against such third party for the balance of any sum recovered in litigation, or paid in compromise settlement, after subtraction of reasonable attorney's fees and other proper disbursements, but only to the extent of the compensation payable under this article by the employer. Any recovery against such third person in excess of the compensation theretofore paid by the employer shall be paid forthwith to the employe or to the dependents, and shall be treated as an advance payment by the employer on account of any future instalments of compensation.
Where an employe has received payments for the disability or medical expense resulting from a disability in the course of his employment, paid by the employer or an insurance company on the basis that the disability was not compensable under this act, in the event of an agreement or award for that disability, the employer or insurance company, who made the payments, shall be subrogated out of the agreement or award to the amount so paid, if the right to subrogation is agreed to by the parties or is established at the time of hearing before the referee or the board.
77 P.S. § 1419