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An expert group has been responsible for the ATC classification of radiopharmaceuticals in V09 and V10. The group has also prepared the guidelines for classification of these products.
Radiopharmaceuticals for diagnostic use are classified in this group, while radiopharmaceuticals for therapeutic use are classified in V10. In general, the 3rd level are subdivided according to site of action or organ system, the 4th level according to radionuclide and the 5th level specifies the chemical substance. The ATC 5th level defines the actual form essential in nuclear medicine procedures, which includes radionuclide and carrier molecule. Therefore, products on the market, that can often be regarded as intermediate products rather than ready-to-use radiopharmaceuticals, can be given more than one (5th level) ATC code, e.g. technetium (^99mTc) exametazime (V09AA01) and technetium (^99mTc) exametazime labelled cells (V09HA02).
ATC codes are not assigned for radionuclide precursors which are used only in the radiolabelling of another substance prior to administration.

This group comprises monoclonal antibodies and other compounds used for tumour detection.

V09IA Technetium (^99mTc) compounds
V09IB Indium (¹¹¹In) compounds
V09IX Other diagnostic radiopharmaceuticals for tumour detection

Gallium-citrate used for non-specific tumour localisation is classified in V09H - Inflammation and infection detection. Thallium-chloride used for tumour detection is classified in V09G - Cardiovascular system. Iobenguane (¹³¹I) in low dose is classified here while high dose for therapy is classified in V10X - Other therapeutic radiopharmaceuticals.