Secondary malignant neoplasm of kidney

This code signifies the presence of a malignant tumor in the kidney that originated from a primary cancer elsewhere in the body and subsequently metastasized to the kidney. It indicates that the kidney itself is not the site of the initial cancer development, but rather a secondary location for cancerous growth.

Apply this code when documentation clearly states metastatic cancer to the kidney, with the primary site identified or implied as being elsewhere. This is appropriate for patients undergoing treatment for renal metastases or when the kidney involvement is a significant factor in their overall cancer management.

• Always code the primary malignant neoplasm first, followed by this code for the secondary site.
• Do not use this code if the kidney is the primary site of the malignancy; refer to codes in the 189.x series for primary renal cancers.
• Ensure documentation specifies "metastatic to kidney" or "secondary malignant neoplasm of kidney" to support its use.