HomeSupport for registriesInternational Classification of Diseases for Oncology (ICD-O)

ICD-O

INTERNATIONAL CLASSIFICATION OF DISEASES FOR ONCOLOGY (ICD-O)

Third edition Edited by A. Fritz, C. Percy, A. Jack,  K. Shanmugaratnam, L. Sobin,D.M. Parkin  and S. Whelan

Please consult the previous versions online and the new links for ICD-O (2nd revision) as follows:

ICD-O 3

ICD-O 3 (1st rev)


ICD-O-3.2

ICD-O-3.2 TABLES

The IARC/WHO ICD-O Committee1 has updated the draft ICD-O-3.1 classification, with new morphology codes and terms from the 4th series of WHO Classification of Tumours (Blue Books).

The new version, ICD-O-3.2, is recommended for use from 2020.

The IACR Working Group on ICD-O Updates2 has compiled a listing of additions, changes and revisions between ICD-O-3.1 and ICD-O-3.2 as a reference material for cancer registries.

These documents have been revised according to the comments received during the consultation period and the final tables are available for download here:

ICDO- THIRD EDITION, SECOND REVISION MORPHOLOGY

A LISTING OF ALL ADDITIONS, CHANGES AND REVISIONS TO THE ICD-O-3, IST REVISION (ICDO-O-3.1) FOR ICD-O-3.2

 As it is no longer possible to maintain and update the previous http://codes.iarc.fr website, it was decommissioned on 31 July 2019. IARC is updating its web domain and it is not possible to maintain this website on the new platform. We apologize for any inconvenience as a result of the decommissioning.

1 Ian Cree, Jacques Ferlay, Robert Jakob, Brian Rous, Reiko Watanabe, Valerie White, Ariana Znaor

2 Atul Budukh, Jacques Ferlay, Keri Green, Tomohiro Matsuda, Brian Rous, Ariana Znaor


ICD-O-4 (Update as of November 27, 2024)

Due to the lack of available codes for new morphological diagnoses in the current 4-digit morphology structure, the next ICD-O edition (ICD-O-4) will have a 5th digit will be added.

This approach, with the addition of a “0” where there is no need for a more specific code, or other values if needed was chosen for the ease of conversion and consistency with ICD-O-3 (similar to a MOTNAC to ICD-O-1 conversion). Adding an additional digit to the existing four retains the needed consistency, including the possibility to collapse to previous versions, but will likely require minor changes in registry software, notification forms, etc.

Compilation of ICD-O-4, which will be based on the 5th edition of the WHO Classification of Tumours (Blue Books) is currently in progress. Once the beta version is available (tentatively early 2024), it will be open for comments for a six months consultation period.

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