Based topography codes on ICD-10: which edition of ICD-O is used?

Based topography codes on ICD-10: which edition of ICD-O is used?

• A. ICD-O first edition
• B. ICD-O third edition
• C. ICD-O fourth edition
• D. ICD-O second edition

Answer: (D)

Topography codes identify where the tumor originated in the body. When you align these site codes with ICD-10, the reference system used for the topography part is ICD-O, and the edition historically used for that crosswalk is ICD-O second edition. The later editions of ICD-O (such as the third or fourth) mainly update morphology terminology and some site terms, but the established practice for mapping topography to ICD-10 has long been built on ICD-O-2. That’s why, in this context, ICD-O second edition is the correct reference for topography coding with ICD-10.

Topography codes identify where the tumor originated in the body. When you align these site codes with ICD-10, the reference system used for the topography part is ICD-O, and the edition historically used for that crosswalk is ICD-O second edition. The later editions of ICD-O (such as the third or fourth) mainly update morphology terminology and some site terms, but the established practice for mapping topography to ICD-10 has long been built on ICD-O-2. That’s why, in this context, ICD-O second edition is the correct reference for topography coding with ICD-10.