Small kidney, unilateral

This code represents a condition where one kidney is abnormally small in size. This can be due to congenital factors (present at birth) or acquired causes such as chronic kidney disease or vascular compromise. The small size may impact renal function.

Use this code when documentation clearly indicates a unilateral small kidney, often identified through imaging studies like ultrasound or CT scans. This diagnosis is applicable whether the small size is congenital or acquired, as long as it affects only one kidney.

• Ensure documentation specifies "unilateral" to differentiate from bilateral small kidneys.
• Do not confuse with renal hypoplasia (underdevelopment) or renal atrophy (wasting away) if the documentation only states "small kidney."
• Code any underlying cause or associated conditions, such as chronic kidney disease, as additional diagnoses.