Malignant neoplasm of sigmoid colon

This code signifies a primary cancerous tumor originating in the sigmoid colon, the S-shaped final section of the large intestine before the rectum. This malignancy involves uncontrolled cell growth and has the potential to invade surrounding tissues and metastasize to distant sites.

Use this code when documentation confirms a diagnosis of adenocarcinoma or other primary malignant neoplasm specifically located in the sigmoid colon. This applies to initial diagnoses, active treatment phases, and follow-up for current disease. Supporting documentation includes pathology reports, operative reports, and physician notes explicitly stating the sigmoid colon as the tumor site.

• Always verify the specific subsite within the colon; do not use for general colon cancer or other colonic segments.
• Distinguish between primary malignant neoplasms and secondary (metastatic) tumors to the sigmoid colon.
• Consider sequencing rules for multiple primary malignancies or when coding complications related to the neoplasm.