LB30.9 Multicystic renal dysplasia

International Classification of Diseases for Mortality and Morbidity Statistics, 11th Revision, v2026-01


Multicystic renal dysplasia, or multicystic dysplastic kidney (MCDK), is a congenital condition where a kidney fails to develop properly in the womb, becoming a non-functional collection of fluid-filled cysts instead of normal kidney tissue. It most often affects a single kidney, allowing the other healthy kidney to compensate for its function, and is usually discovered via prenatal ultrasound. Bilateral MCDK, affecting both kidneys, is a very serious condition with a high risk of kidney failure and is often incompatible with long-term survival.

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