Field Length:   4

The current Solid Tumor Rules, the Hematopoietic and Lymphoid Neoplasm Coding Manual and Database, and the International Classification of Diseases for Oncology, Third Edition, Second Revision Morphology (ICD-O-3.2) are the standard references for histology codes.

ICD-O-3.2

Standard setters have agreed to implement new histology terms and codes for ICD-O-3 based on the current versions of the World Health Organization Classification of Tumors. The update, referred to as ICD-O-3.2,

includes comprehensive tables listing histology codes and behavior codes in effect beginning with cases diagnosed in 2021 The new codes, new terms, and codes with changes to behavior are available at the  NAACCR website.

Histology Coding for Solid Tumors

Apply the general instructions and instructions for coding histologic type in the current Solid Tumor Rules.

Apply the site-specific histology coding rules in the current Solid Tumor Rules.

Site-specific histology coding rules cover the following sites/types.

Histology Coding for Hematopoietic and Lymphatic Primaries

Apply the Histology Coding Rules in the Hematopoietic and Lymphoid Neoplasm Coding Manual and Database.

See also the NAACCR 2015 Implementation Guidelines and Recommendations: The Hematopoietic Conversion Documentation.