ICD-10 Code D41.0 – Neoplasm of uncertain behavior of kidney (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D41.0 – Neoplasm of uncertain behavior of kidney
What it is
D41.0 identifies a kidney mass or lesion whose behavior cannot be confirmed as benign or malignant from available documentation. Use it when the record states uncertain, borderline, or indeterminate neoplasm of the kidney.
Clinical signs
Clinical features vary; refer to documentation. Imaging may show a renal mass, but pathology or clinical assessment does not establish definite malignancy or benignity.
When to use this code
Use D41.0 when the provider documents an uncertain neoplasm of the kidney, including indeterminate renal tumors or masses awaiting definitive characterization. Assign it only when the uncertainty is about biologic behavior, not simply about the diagnosis itself. Check documentation if the note instead describes a cyst, infection, or known cancer.
Do not use for
Do not use this code for clearly benign renal lesions, malignant kidney neoplasms, or non-neoplastic renal masses. If the record shows a specific renal cyst or carcinoma, code that diagnosis instead.
Coding tip
Verify the provider’s wording carefully; D41.0 applies only when the kidney neoplasm’s behavior is explicitly uncertain.