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-3.2
Update as of January 25, 2021: The preparation of ICD-O-3.2 book (pdf) is with the WHO Publications, and we will post updates on this publication on this page and via email announcement to registries. In the meantime, please refer to the tables available here.
We would like to thank once again everyone who provided further comments. After posting the documents online in November 2019, we made minor updates mostly related to adding missing codes to the list of changes document. We also added the ICD-O-3.2 version of the morphological groups used to define multiple primary tumours. The latest versions of these documents can be accessed from the list (ICD-O3.2 TABLES) below.
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 summary of the main changes
- Terms that are changing behaviour
- New codes and their terms
- Deleted codes and their terms
- Updated table: "Groups of malignant neoplasms considered to be histologically different for the purpose of defining multiple tumours" to be used with ICD-O-3.2 (The rest of the multiple primary rules remain unchanged.)
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 January 25, 2021)
With the new 5th edition of the Blue Books commencing (it will be completed by mid-2023), it is now the time for the IARC WHO Classification of Tumours Group to start creating new codes. Due to the lack of available codes for new morphological diagnoses in the current 4-digit morphology structure, it is proposed for the next ICD-O edition (ICD-O-4) that 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.
As the previous IACR ICD-O Working Group has now concluded its work with ICD-O-3.2, IACR will establish a new WG with global representation, with a terms of reference that focuses on the required planning for the implementation of ICD-O-4 in cancer registries worldwide.
