Secondary malignant neoplasm of left kidney and renal pelvis

This code signifies the presence of a metastatic cancerous tumor that originated elsewhere in the body and has subsequently spread to the left kidney or its renal pelvis. It indicates that the kidney is not the primary site of the malignancy but rather a secondary location for tumor growth.

Apply this code when documentation clearly states a metastatic lesion is present in the left kidney or renal pelvis, and the primary malignancy is known or being treated. This code is appropriate when imaging reports (e.g., CT, MRI) or pathology confirms a secondary malignant neoplasm in the specified location.

• Always sequence the primary malignancy code before this secondary site code, unless the primary site is unknown or has been excised and is no longer being treated.
• Ensure documentation specifies "left" kidney; if laterality is not documented, query the provider.
• Do not confuse with C64.1 (Malignant neoplasm of left kidney, except renal pelvis), which represents a primary malignancy of the left kidney.