Nephrolithiasis, also known as kidney stones or renal calculi, refers to the presence of stones within the kidneys. It is one of the most commonkidney diseasesin adults. ICD 10 code for Calculus of kidney. Get free rules, notes, crosswalks, synonyms, history for ICD-10 code N20.0. Kidney stones can affect any of the organs that make urine or remove it from the body — from the kidneys to the bladder. Often, stones form when the urine has less water in it. This lets minerals form crystals and stick together. Passing kidney stones can be quite painful. But prompt treatment usually helps prevent any lasting damage. 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.