Bilateral small kidneys

This code represents a congenital or acquired condition where both kidneys are abnormally small in size. This can indicate renal hypoplasia, dysplasia, or chronic kidney disease leading to bilateral renal atrophy.

Use this code when documentation explicitly states "bilateral small kidneys" or "bilateral renal atrophy." It is appropriate for conditions such as bilateral renal hypoplasia or end-stage renal disease where both kidneys have diminished in size.

• Distinguish from unilateral small kidney (589.0) or unspecified small kidney (589.9).
• Always code the underlying cause of the small kidneys if known and documented (e.g., chronic kidney disease, congenital anomaly).
• Ensure imaging reports (ultrasound, CT) or physician notes clearly specify "bilateral" and "small" or "atrophic" for both kidneys.