ICD-10 Code C65.9 – Malignant neoplasm of unspecified renal pelvis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C65.9 – Malignant neoplasm of unspecified renal pelvis
What it is
This code identifies a malignant tumor arising in the renal pelvis, but the exact side is not specified. Use it when the record confirms cancer of the renal pelvis without laterality.
Clinical signs
Clinical features may include hematuria, flank pain, or urinary obstruction, but presentation can be variable. Confirm the diagnosis with documentation of a malignant renal pelvis neoplasm.
When to use this code
Use C65.9 when the provider documents malignant neoplasm of the renal pelvis and does not state left or right side. It also fits when pathology or imaging identifies renal pelvis cancer, but laterality is missing in the chart. Check documentation if the site is described more broadly.
Do not use for
Do not use this code for malignant neoplasm of the kidney parenchyma, ureter, or bladder. Do not assign it when the record specifies a different renal pelvis side or a more precise urinary tract site.
Coding tip
Always look for laterality first; if the chart names a side, choose the more specific code instead of C65.9.