ICD-10 Code D49.512 – Neoplasm of unspecified behavior of left kidney (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D49.512 – Neoplasm of unspecified behavior of left kidney
What it is
This code identifies a kidney mass in the left kidney whose behavior is not specified as benign or malignant. Use it when documentation shows a neoplasm, but the final nature of the growth is still unclear.
Clinical signs
Clinical features vary; refer to documentation. Imaging may show a renal mass, but pathology or follow-up is needed to clarify behavior before assigning a more specific diagnosis.
When to use this code
Use D49.512 when the provider documents an unspecified neoplasm of the left kidney and does not state whether it is benign, malignant, or uncertain behavior. It may also fit when a renal mass is noted, but the record does not support a more specific code. Check documentation for laterality and behavior.
Do not use for
Do not use this code for clearly benign, malignant, or metastatic kidney tumors. Also avoid it if the documentation names a different kidney, or if the lesion is better described by another renal diagnosis.
Coding tip
Verify both laterality and tumor behavior in the note before coding, and query the provider if the wording is ambiguous.