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ICD 10 code for Calculus of kidney. Get free rules, notes, crosswalks, synonyms, history for ICD-10 code N20.0. What Are Kidney Stones? Kidney stones are hard crystalline structures formed within the kidney or urinary tract due to supersaturation of certain minerals in urine. Common types of kidney stones include calcium oxalate, calcium phosphate, uric acid, and struvite stones. Kidney stone disease or urinary stone disease is a crystallopathy that occurs when there are too many minerals in the urine and not enough liquid or hydration. This imbalance causes tiny pieces of crystal to aggregate and form hard masses, or calculi (stones) in the upper urinary tract. [2] Because renal calculi typically form in the kidney, if small enough, they are able to leave the urinary tract via the urine stream. [2] A small calculus may pass without causing symptoms. [2] However, if ... Understand the kidney stone size chart in mm and cm by the expert doctor here. Learn about treatments based on kidney stone size. Explore normal calculi sizes.