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ICD-O-3: Coding Primary Site and Tumour Morphology

These modules on coding topography, morphology and cancer stage have been developed through a collaboration between the European Network of Cancer Registries, Joint Research Centre of the European Commission and ecancer.

The purpose of the modules is to train the cancer registrars to implement the international classifications for coding a cancer case.

This module 1 presents an introduction to coding topography and morphology using the third edition of the International Classification of Diseases for Oncology - ICD-O-3.

Published November 2021.

ICD-O-3: Coding Primary Site and Tumour Morphology
1 CME Points

Target audience

These training modules have been designed for cancer registry staff, eg. coders, database managers, and analysts.


Learning objectives

By the end of this module, you should:
1) Know the general principles and rules of ICD-O-3
2) Understand the structure of topography and morphology codes
3) Be able to apply the ICD-O-3 rules for coding the topography and morphology of a cancer case

IT Requirements

This module requires the learner to have a good, stable internet connection and can run on Internet Explorer 7 and above, Mozilla Firefox, Google Chrome and Opera on either Windows or MacOS. Flash Add-on is also required to run this module.

If you are viewing this module on an iPad (through a browser), please download the free Articulate Mobile Player beforehand. Other tablet devices may not be compatible - please check for Flash compatibility.

If you are experiencing technical difficulties, please contact education@ecancer.org and we will get back to you as soon as possible.

Disclosure policy

ecancer and everyone involved in the making of this module have no actual or potential conflict of interest whatsoever which impinges on the making, peer reviewing and dissemination of this e-learning module.

For more information please contact education@ecancer.org.