Extraction of one or more chronically implanted transvenous pacing or defibrillator leads, by percutaneous method, with locking stylets and snares, with extraction sheaths (if any), if: (a) the leads have been in place for more than 6 months and require removal; and (b) the service is performed: (i) in association with a service to which item 61109 or 60509 applies; and (ii) by a specialist or consultant physician who has undertaken the training to perform the service; and (iii) in a facility where cardiothoracic surgery is available and a thoracotomy can be performed immediately and without transfer; and (c) if the service is performed by an interventional cardiologist—a cardiothoracic surgeon is in attendance during the service (H) (Anaes.) (Assist.)