Microvascular anastomosis of artery or vein using microsurgical techniques, for replantation or revascularisation of limb or digit, if the limb or digit is devitalised and the repair is critical for restoration of blood supply, other than a service associated with a service to which item 45564, 45565, 45567, 46060, 46062, 46064, 46066, 46068, 46070 or 46072 applies (H) (Anaes.) (Assist.)