Neoplasm of uncertain behavior of right kidney

This code signifies the presence of an abnormal growth within the right kidney where the pathologist cannot definitively classify it as benign or malignant based on current microscopic examination. It indicates that the biological behavior of the tumor is currently indeterminate. Further investigation is typically required to determine the true nature of the neoplasm.

Use this code when pathology reports describe a renal mass in the right kidney with findings such as "atypical cells," "borderline tumor," "uncertain malignant potential," or "neoplasm of undetermined behavior." This code is appropriate when the pathologist explicitly states that the tumor's behavior cannot be definitively categorized as benign or malignant. Documentation must clearly specify the right kidney as the affected site.

• Do not use this code if the pathology definitively identifies the neoplasm as benign (e.g., renal cyst, angiomyolipoma) or malignant (e.g., renal cell carcinoma).
• Ensure laterality is clearly documented (right kidney) to avoid using unspecified or left kidney codes.
• If subsequent pathology definitively classifies the tumor, update the diagnosis to the appropriate benign or malignant code.