Histology Coding Rules: Colon/Rectum
3. (Continued) Example: Transverse colon, polyp and
1) carcinoma in a polyp
separate 2 cm lesion
Answer: 8010/3 Carcinoma
Example: There is a polyp and a separate lesion in the transverse colon. The histology for the polyp is carcinoma in a polyp, and the histology for the separate lesion is carcinoma. Per rule 3, the carcinoma is coded when there is both a polyp with carcinoma and a separate lesion with carcinoma in the same colon segment. The histology is carcinoma (8010/3).