Cystic dilatation of collecting ducts

This code describes a congenital anomaly characterized by the abnormal widening or expansion of the collecting ducts within the kidney. This condition is often associated with medullary sponge kidney, where the renal pyramids appear porous due to dilated collecting tubules. It can lead to urinary stasis, stone formation, and recurrent infections.

Use this code when documentation explicitly states "cystic dilatation of collecting ducts" or "medullary sponge kidney" with evidence of dilated collecting tubules. This diagnosis is typically made through imaging studies such as ultrasound, CT scan, or intravenous pyelogram. It is appropriate for both initial diagnosis and subsequent encounters for management of this condition.

• Ensure documentation clearly specifies "cystic dilatation of collecting ducts" rather than general renal cysts.
• Do not confuse with other types of renal cysts (e.g., simple renal cyst, polycystic kidney disease) which have different codes.
• Consider sequencing with codes for associated conditions such as nephrolithiasis (N20.0) or urinary tract infections (N39.0) if present.