Calculus of lower urinary tract (N21)

The ICD-10 code N21 and its subcodes classify types of stones, or calculi, specifically located in the lower urinary tract. These codes are used when documenting conditions such as bladder stones or urethral stones.

This section includes N21.0 for a calculus in the bladder, covering common terms like urinary bladder stone or uric acid urolithiasis. The N21.1 code identifies stones found in the urethra. Other less specific lower urinary tract stones fall under N21.8, including terms like vesicoureteric junction calculus. When the location of the stone within the lower urinary tract is not specified, N21.9 is used. For anyone searching the ICD-10 code for bladder stones or urethral calculi, these codes provide precise classification and help ensure correct medical coding and billing for these conditions.