50 Pa. Stat. § 9003
The bylaws of any hospital may provide for the appointment of a psychologist as a voting member of the professional staff on such terms and conditions as the hospital shall reasonably establish. Notwithstanding a provision in the bylaws permitting a hospital to provide for the appointment of a psychologist as a voting member of the professional staff, the hospital shall not be required to do so. The medical staff of any hospital whose bylaws permit appointment of a psychologist as a voting member of the professional staff shall define in its bylaws the requirements for the delineation and retention of clinical privileges by a psychologist. Each psychologist accepted on the professional staff shall be qualified for the exercise of the specific clinical privileges granted to that psychologist. Those granted clinical privileges shall currently hold licenses to practice in this Commonwealth.
50 P.S. § 9003