Calculus of lower urinary tract, unspecified

This code signifies the presence of a calculus (stone) within the lower urinary tract, which includes the bladder and urethra, when the specific location or type of calculus is not documented. It indicates an uncharacterized stone formation in the urinary system below the ureters.

Use this code when documentation confirms a lower urinary tract calculus but lacks specificity regarding its exact location (e.g., bladder vs. urethra) or composition. This code is appropriate when the provider's assessment simply states "lower urinary tract calculus" without further detail.

• Do not use this code if the documentation specifies the calculus is in the kidney or ureter; refer to codes in the N20 category.
• Avoid this code if the documentation provides a more specific location within the lower urinary tract (e.g., N21.0 for calculus in bladder).
• Remember the Excludes1 note: N20.9 (calculus of urinary tract NOS) should never be coded with N21.9. If the documentation is truly non-specific to the entire urinary tract, use N20.9.