Histology Coding Rules: Colon/Rectum
Example: Splenic flexure tumor, signet ring cell carcinoma with features of mucinous carcinoma
Signet ring cell carcinoma
Answer: 8480/3 Mucinous carcinoma
Example: The single tumor of the splenic flexure is described as signet ring cell carcinoma with features of mucinous carcinoma. Because “with features of” is terminology that indicates tumor majority, the mucinous carcinoma should be recorded as the histology. The correct code for mucinous carcinoma is 8480/3.