Urolithiasis (N20-N23) ICD-10-CM
The N20–N23 section covers urolithiasis with 12 ICD-10-CM diagnosis codes, of which 10 are billable in fiscal year 2026. The section is organized into the 4 code ranges listed below.
Code Ranges in This Section 4 ranges · 12 codes
The info icon previews the code ranges inside each row and its instructional notations from the official Tabular List.
About the N20–N23 Code Range
ICD-10 codes N20 through N23 are used to classify different types of urinary tract stones, including kidney and ureter stones, as well as unspecified kidney pain related to these conditions.
This code range covers specific urinary calculi such as N20.0 for kidney stones, including common forms like calcium oxalate and uric acid stones often referred to as recurrent kidney stones or staghorn calculi. N20.1 captures ureteral stones, sometimes called ureteric stones or ureteral sludge, which can cause urinary tract obstruction. When stones are present in both the kidney and ureter, N20.2 is applied. Lower urinary tract stones, including bladder and urethral stones, fall under N21 codes, with subcategories for bladder calculi (urinary bladder stones) and urethral calculi. Cases where urinary stones are linked to other diseases are coded as N22. Finally, N23 describes unspecified renal colic or kidney pain conditions often synonymous with ureteric colic, helping clinicians document symptomatic presentations without a confirmed stone diagnosis.
Questions About This Page
How many codes are in the N20-N23 range?
The N20-N23 range contains 12 ICD-10-CM diagnosis codes in FY 2026. 10 of them are billable, and the rest are category headers that organize the section.
What conditions does N20-N23 cover?
The range covers urolithiasis. The code ranges listed above break it into groups of related conditions, and each one links to its own page with the full code list.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
