Complex insertion of any of the following interstitial brachytherapy implants requiring surgical exposure (other than a service to which item 15900 applies), if a radiation oncologist is in attendance at the initiation of the service: (a) catheters, needles or applicators to a region requiring surgical exposure; (b) radioactive sources for permanent implants; (c) surface moulds during intraoperative brachytherapy; (d) plastic catheters or stainless steel needles, requiring surgical exposure; including implantation and removal of applicators, catheters or needles (Anaes.)