The international (English) edition of ICD-O-3, the WHO standard for cancer registry coding
The international edition of ICD-O-3, published in English by the World Health Organization. It is the English reference edition for cancer registries. Around 1,600 codes across two axes: topography (C-codes) and morphology (M-codes).
Every tumor is returned as a paired topography code (anatomical site, e.g., C18.2) and morphology code (histological type and behavior, e.g., 8480/3). See the ICD-O-3 overview for the behavior suffixes.