Malignant neoplasm of sigmoid colon

This code identifies a primary cancerous tumor located specifically within the sigmoid colon. This is a segment of the large intestine that connects the descending colon to the rectum. The malignancy originates in the tissues of the sigmoid colon itself.

Assign this code when documentation clearly indicates a primary malignant neoplasm confined to the sigmoid colon. This diagnosis is typically supported by pathology reports confirming adenocarcinoma or other types of carcinoma, and imaging studies localizing the tumor to this specific anatomical site.

• Differentiate from C19 (malignant neoplasm of rectosigmoid junction) based on precise tumor location.
• Ensure the documentation specifies "primary" malignancy; use secondary codes for metastatic disease.
• Consider additional codes for complications, such as obstruction or perforation, if documented.