Calculus of kidney

This code represents the presence of a kidney stone, also known as renal calculus or nephrolithiasis, within the kidney. These are hard deposits made of minerals and salts that form inside the kidneys, often causing pain, obstruction, and other urinary symptoms.

Use this code when documentation clearly indicates the presence of a calculus located specifically within the kidney. This diagnosis is commonly supported by imaging studies such as CT scans, ultrasounds, or X-rays, and clinical findings like flank pain or hematuria.

• Do not use this code if the calculus is located in the ureter or bladder; use more specific codes for those locations.
• If the laterality is specified (e.g., right kidney, left kidney), ensure the appropriate laterality subcode is selected.
• Consider additional codes for any associated complications, such as hydronephrosis (N13.0-N13.39) or urinary tract infection (N39.0).