The Commonwealth Court has ruled in a case of first impression that doctors who perform impairment rating evaluations under the state Workers’ Compensation Act must have a practice in which they treat or manage the care of patients for at least 20 hours a week.

A three-judge panel in Verizon Pennsylvania v. Workers’ Compensation Appeal Board (Ketterer) unanimously affirmed a Workers’ Compensation Appeal Board decision denying plaintiff Verizon Pennsylvania Inc.’s modification petition seeking to change defendant Arthur Ketterer Jr.’s status from total disability to partial disability.