Neoplasm of uncertain behavior of small intestine

This code signifies a tumor of the small intestine that exhibits features making it difficult to classify as definitively benign or malignant. It represents an abnormal growth where the biological behavior, such as potential for invasion or metastasis, cannot be determined from current pathological examination.

Apply this code when pathology reports describe a small intestinal neoplasm as "uncertain," "borderline," or "of uncertain malignant potential." This is appropriate when the pathologist cannot definitively categorize the lesion as benign or malignant based on microscopic findings.

• Ensure the pathology report explicitly states "uncertain behavior" or similar terminology for a small intestinal neoplasm.
• Do not use this code if the neoplasm is clearly identified as benign (e.g., adenoma) or malignant (e.g., adenocarcinoma).
• Review documentation for specific location within the small intestine (duodenum, jejunum, ileum) as more specific codes may exist for certain sites if the behavior is known.