Histology Coding Rules: Colon/Rectum
Rules are a hierarchy
Use rules in priority order with rule 1 having highest priority
Use the first rule that applies
Rules from SEER Program Coding and Staging Manual (PCSM) 2004, pages 86– 87
The histology coding rules are a hierarchy. They are listed in priority order and rule 1 has the highest priority. When determining what code to record for histology, begin with rule 1 and stop when you get to the first rule that applies. If rule 1 applies, there is no need to go any further. The rules for coding histology are found in the SEER Program Coding and Staging Manual 2004, pages 86–87. As documented in NAACCR Volume II: Data Standards and Data Dictionary, the source of the standards for histology are SEER and the Commission on Cancer. The SEER rules for histology coding are used because SEER has always worked closely with the editors of the ICD-O-3 Manual on use of the Manual.