California Cancer Reporting System Standards Volume I: Abstracting and Coding Procedures

Histology is the study of the minute structure of cells, tissues, and organs in relation to their functions. It is primarily through histological analysis that neoplasms are identified. Determination of the correct histology code can be one of the most difficult aspects of abstracting. Training and experience are essential for development of the ability to assign the correct code. The rules are taken from the SEER Program. They provide guidance, but no set of rules can cover all situations.