Malignant neoplasm of unsp kidney, except renal pelvis

This code signifies a primary cancerous tumor originating in the kidney tissue itself, excluding the renal pelvis, where the specific side (left or right) of the affected kidney is not documented. It represents an aggressive, uncontrolled growth of abnormal cells within the kidney parenchyma.

This code is appropriate when documentation confirms a malignant neoplasm of the kidney, but the laterality (left or right kidney) is not specified by the provider. It is used when the tumor is confirmed to be within the kidney's functional tissue, rather than the collecting system.

• Only use this code when laterality is genuinely unknown or unstated in the medical record.
• Prioritize codes that specify laterality (e.g., C64.1 for right kidney, C64.2 for left kidney) if available in the documentation.
• Distinguish from renal pelvis malignancies (C65.-) and benign kidney neoplasms (D30.0-).