Calculus of lower urinary tract (N21) ICD-10-CM
The N21 code range covers calculus of lower urinary tract with 5 ICD-10-CM diagnosis codes. 4 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Includes
This note appears immediately under a three character code title to further define, or give examples of, the content of the category.
- calculus of lower urinary tract with cystitis and urethritis
Codes in the N21 Range 5 codes · 4 billable
About the N21 Code Range
A calculus is a stone. This category describes stones in the lower urinary tract.
The subdivisions distinguish a stone in the bladder, N21.0, from one in the urethra, N21.1. N21.8 describes other lower urinary tract stones, while N21.9 leaves the location unspecified.
Questions About This Page
How many billable codes are in the N21 range?
Of the 5 codes in this range, 4 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the N21 range classify?
The range classifies calculus of lower urinary tract. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
