Small kidney, bilateral

This diagnosis code signifies a condition where both kidneys are abnormally reduced in size. This can be due to congenital hypoplasia, acquired atrophy, or chronic kidney disease, leading to impaired renal function.

This code is appropriate when imaging studies (e.g., ultrasound, CT scan) or surgical findings confirm that both kidneys are smaller than expected for the patient's age and body size. Documentation should clearly state "small kidneys, bilateral" or similar terminology indicating the bilateral nature of the condition.

• Ensure documentation explicitly states "bilateral" to support the use of this specific code.
• Do not use this code if only one kidney is small; instead, refer to codes for unilateral small kidney (e.g., N27.0).
• Code any underlying cause of the small kidneys (e.g., chronic kidney disease, congenital anomalies) as an additional diagnosis.