Urolithiasis ICD-10 code
The ICD-10-CM code for urolithiasis is N20.9 (urinary calculus, unspecified). It is billable and valid for submission on a claim. There are 11 related codes, and which one you use depends on what the documentation supports.
Also written as kidney stones, urinary stones.
The mistake coders make here
N20.9 is only for a stone with no documented site. A documented site changes the code: kidney N20.0, ureter N20.1, both N20.2, bladder N21.0, urethra N21.1. If hydronephrosis is documented with a kidney or ureter stone, N20 is excluded and the code is N13.2.
Putting urolithiasis on a claim? Check the claim’s diagnosis codes free: Excludes1 conflicts, header codes and missing seventh characters, before it goes out.
ICD-10-CM codes for urolithiasis
11 of 11 are billable. Green means you can submit it as-is.
| Code | Use it when |
|---|---|
| N20.9 | Urinary calculus, unspecified |
| N20.0 | Calculus of kidney |
| N20.1 | Calculus of ureter |
| N20.2 | Calculus of kidney with calculus of ureter |
| N21.0 | Calculus in bladder |
| N21.1 | Calculus in urethra |
| N21.8 | Other lower urinary tract calculus |
| N21.9 | Calculus of lower urinary tract, unspecified |
| N22 | Calculus of urinary tract in diseases classified elsewhere |
| N13.2 | Hydronephrosis with renal and ureteral calculous obstruction |
| Z87.442 | Personal history of urinary calculi |
Once you have the code
- Check the whole claim: Excludes1 conflicts and missing seventh characters, free
- Denial codes explained: what CO-16, CO-97 and the rest actually mean
- Decision guides: walk a chart note to a code, guideline cited
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