Calculus of kidney and ureter (N20) ICD-10-CM
The N20 code range covers calculus of kidney and ureter with 5 ICD-10-CM diagnosis codes. 4 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Inclusion Terms
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
- Calculous pyelonephritis
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Codes in the N20 Range 5 codes · 4 billable
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the N20 range.
Urolithiasis
Formation of stones in any part of the URINARY TRACT, usually in the KIDNEY; URINARY BLADDER; or the URETER.
About the N20 Code Range
ICD-10 code N20 covers the diagnosis of stones, also called calculi, found in the kidney and ureter. These codes specify the exact location and type of urinary calculi, providing critical detail for medical coding and patient treatment, including N20.0 for kidney stones, N20.1 for ureter stones, N20.2 when stones are in both kidney and ureter, and N20.9 for unspecified urinary stones.
These codes are essential when documenting patients with conditions such as recurrent kidney stones, staghorn calculi, or ureteric stones, helping differentiate between stones in the kidney (like calcium oxalate or uric acid calculi) and those blocking the ureter, which can cause obstruction. For example, common terms like "kidney stone," "ureteric stone," or "Steinstrasse" correspond to N20.0 and N20.1. The category also recognizes combined stones in both sites (N20.2) and cases where the exact location or type is not known (N20.9). This specificity supports accurate ICD-10 coding for urology and nephrology care, ensuring clear identification of "ICD-10 code for kidney stone" or "ureter stone."
Questions About This Page
How many billable codes are in the N20 range?
Of the 5 codes in this range, 4 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the N20 range classify?
The range classifies calculus of kidney and ureter. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
