ICD-O-3 - Corti API Documentation

ICD-O-3 is a dual-axis code system for oncology, published by the World Health Organization. It is used worldwide by cancer registries to code every recorded tumor with a topography code (the anatomical site) and a morphology code (the histological type and behavior).

Overview

Around 1,600 codes across two axes: topography (C-codes, e.g., C18.2) and morphology (M-codes, e.g., 8480/3).
Each tumor is coded with a paired topography and morphology code, and the two axes are searched and reconciled together.
Morphology codes carry a behavior suffix that indicates how the tumor is expected to act: /0 benign, /1 uncertain, /2 in situ, /3 malignant, /6 metastatic, /9 uncertain whether a primary or metastatic site.

Editions

Edition	Language	System identifier	Status
ICD-O-3	English (International)	`icdo3int`
ICD-O-3	German	`icdo3de`
ICD-O-3	French	`icdo3fr`

The system field accepts the edition identifier. ICD-O-3 does not use an encounter-type suffix.

Morphology behavior

Morphology codes carry a behavior suffix that indicates how the tumor is expected to act. The suffix is the digit after the slash, for example the /3 in 8480/3.

Suffix	Behavior
`/0`	Benign
`/1`	Uncertain whether benign or malignant
`/2`	In situ
`/3`	Malignant, primary site
`/6`	Metastatic
`/9`	Uncertain whether primary or metastatic