Health data standards and systems

Please provide advice on how to code administration of SIR-spheres or SIRTEX (a product that emits radiation to kill cancer cells in the liver). Microspheres are injected into a patient's liver. The microspheres are radioactive isotope yttrium-90, which emit ionising beta radiation that destroys cancer cells.The specific procedure we identified was performed in the Radiology department and involved angiography of the liver. The hepatic artery was cannulated using a micro-catheter and one third of the total dose was infused into the left hepatic artery. Two thirds of the dose was then infused into the right hepatic artery via a micro-catheter.How should this procedure be coded? The following codes have been suggested by various sources:
35317-00 [741] Percutaneous peripheral arterial or venous catheterisation with admin of thrombolytic or chemotherapeutic agents by cont infusion or
15600-00 [1789] Stereotactic radiation treatment, single doseor
16003-00 [1795] Administration of a therapeutic dose of Yttrium 90 (and the angiography code)

Information on this relatively new procedure was sourced on the internet:

http://www.sirtex.com/?p=57
Targeted Radiotherapy with SIR-Spheres
SIR-Spheres® are biocompatible radio-active micro-spheres that contain yttrium-90 and emit beta radiation. SIR-Spheres® are implanted using a syringe and travel via the blood stream, whereupon the spheres are targeted to the tumours within the liver. The SIR-Spheres® are trapped in the small blood vessels of the tumour. It is not necessary to identify either the number or location of the tumours within the liver, as the SIR-Spheres® will target them regardless of where they are. Once targeted to the tumour, SIR-Spheres® irradiate it by a process known as Selective Internal Radiation Therapy (SIRT), leading to the destruction of the tumour, whilst most of the normal liver tissue remains relatively unaffected.

Clinical advice received indicated that this procedure is a combination of both radiotherapy and embolisation:

http://www.radiologyinfo.org/content/interventional/catheter-embol.htm
Catheter Embolization
Embolization, a fairly new treatment method, is a way of occluding (closing)—or at least drastically reducing—blood flow to one or more blood vessels that are doing more harm than good. One of a variety of materials, depending on whether vessel occlusion is to be temporary or permanent, is passed through a catheter whose tip lies in or near the vessel to be closed. This approach can be used to control or prevent abnormal bleeding as well as to shut down the vessels that support a growing tumor.

The Committee decided that the following codes should be assigned for this procedure:
16003-00 [1795] Administration of a therapeutic dose of Yttrium 90
35321-00 [767] Transcatheter embolisation of blood vessel