Aneurysm of renal artery

This code signifies an abnormal, localized dilation or ballooning of the renal artery wall. This weakening can lead to rupture, thrombosis, or embolization, potentially compromising kidney function or causing life-threatening hemorrhage.

Apply this code when documentation explicitly states a diagnosis of renal artery aneurysm. This includes cases identified incidentally on imaging, during workup for hypertension, or presenting with symptoms such as flank pain or hematuria.

• Ensure documentation specifies "aneurysm" and not merely "dilation" or "ectasia" to support this diagnosis.
• Distinguish from renal artery stenosis (401.0-405.99) unless both conditions are present and separately documented.
• Look for laterality (left, right, bilateral) in the documentation, though this ICD-9 code does not allow for laterality specificity.