Neoplasm of uncertain behavior of colon

This code signifies a colonic lesion that exhibits features making it impossible to definitively classify as benign or malignant based on current pathological findings. It represents an intermediate category where the biological behavior of the neoplasm is not yet fully determined.

Apply this code when pathology reports describe a colonic tumor as "uncertain behavior," "borderline malignancy," or "indeterminate." This is typically used following a biopsy or surgical excision where the pathologist cannot definitively rule out malignancy but also lacks clear evidence of invasion or metastasis.

• Do not use this code if the pathology report clearly states benign (e.g., adenoma) or malignant (e.g., adenocarcinoma).
• Always query the provider for clarification if the pathology report is ambiguous regarding the tumor's behavior.
• This code is often a temporary diagnosis, pending further diagnostic workup or definitive surgical pathology.