ICD-10-CM · Chapter 14 · N00-N99
N21 Calculus of lower urinary tract
Includes
- calculus of lower urinary tract with cystitis and urethritis
Subcodes
Subcodes are listed below for reference. Detail pages are not available for chapters 11–22.
| Code | Description | Billable |
|---|---|---|
| N21..0 | Calculus in bladder | Yes |
| N21..1 | Calculus in urethra | Yes |
| N21..8 | Other lower urinary tract calculus | Yes |
| N21..9 | Calculus of lower urinary tract, unspecified | Yes |
Last reviewed: September 2026