Urolithiasis
12 codes in this section
About Section N20-N23
Section N20-N23 (N20-N23) covers urolithiasis. It sits within the Diseases of the genitourinary system chapter (N00-N99). This section contains 12 ICD-10-CM codes, 10 billable diagnoses you can submit on a claim, and 2 non-billable header codes used to organize the hierarchy.
Codes are organized below by 3-character root. Click the root to see all subcodes underneath it, or click any individual code for full coverage data, payer policies, and linked CPT procedures.
Codes in N20-N23
Grouped by 3-character root code. Click any code for full detail.
| N20.0 | Calculus of kidney | Billable |
| N20.1 | Calculus of ureter | Billable |
| N20.2 | Calculus of kidney with calculus of ureter | Billable |
| N20.9 | Urinary calculus, unspecified | Billable |
| N21.0 | Calculus in bladder | Billable |
| N21.1 | Calculus in urethra | Billable |
| N21.8 | Other lower urinary tract calculus | Billable |
| N21.9 | Calculus of lower urinary tract, unspecified | Billable |
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on May 31, 2026.
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