Incorporated the WHO classification of hematopoietic and lymphoid neoplasms: which ICD-O edition?

Incorporated the WHO classification of hematopoietic and lymphoid neoplasms: which ICD-O edition?

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

Answer: (D)

The edition that integrated the WHO classification of hematopoietic and lymphoid neoplasms into its coding system is the third edition of ICD-O. This edition updated the morphology codes so they aligned with the WHO 2001 classification (and its subsequent refinements), enabling standardized reporting of leukemia, lymphoma, myeloma, and related neoplasms according to WHO categories while using a single, consistent coding framework. Earlier ICD-O editions did not map as directly to the WHO hematopoietic/lymphoid taxonomy, and later updates (the fourth edition) built on that foundation but the key incorporation first occurred with the third edition.

The edition that integrated the WHO classification of hematopoietic and lymphoid neoplasms into its coding system is the third edition of ICD-O. This edition updated the morphology codes so they aligned with the WHO 2001 classification (and its subsequent refinements), enabling standardized reporting of leukemia, lymphoma, myeloma, and related neoplasms according to WHO categories while using a single, consistent coding framework. Earlier ICD-O editions did not map as directly to the WHO hematopoietic/lymphoid taxonomy, and later updates (the fourth edition) built on that foundation but the key incorporation first occurred with the third edition.