2026 ICD-10-CM Diagnosis Code N20.9Urinary calculus, unspecified

ICD-10-CM Codes›N00–N99›N20-N23›N20

ICD-10-CM N20.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

N20.9 is a billable ICD-10-CM diagnosis code for urinary calculus, unspecified. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 693 through 694. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Calculus of urinary tract.

Code Identity

ICD-10-CM Code
N20.9
Billable Status
Yes — Valid for Submission
Code Describes
Urinary calculus, unspecified
Short Description
Urinary calculus, unspecified
Same as the full description in the CMS dataset.
Parent Code
N20
Calculus of kidney and ureter

Code Classification

ChapterN00–N99Diseases of the genitourinary system
SectionN20-N23Urolithiasis
CategoryN20Calculus of kidney and ureter
This CodeN20.9Urinary calculus, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Calcium oxalate urolithiasis
  • Calculous pyelonephritis
  • Calculus of upper urinary tract
  • Indinavir urolithiasis
  • Long-term disorder of dialysis
  • Magnesium ammonium phosphate urolithiasis
  • Matrix stone formation during renal dialysis
  • Pyelonephritis associated with another disorder
  • Radiolucent calculus of urinary tract
  • Uric acid urolithiasis
  • Urinary calculus in schistosomiasis
  • Urolithiasis

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Anuria
      • calculous (impacted) (recurrent)
    • Calculus, calculi, calculous
      • anuria (impacted) (recurrent)
    • Calculus, calculi, calculous
      • urinary (duct) (impacted) (passage) (tract)
    • Stone(s)
      • urinary (duct) (impacted) (passage)

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR GEN005
Calculus of urinary tract
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Urolithiasis

    formation of stones in any part of the urinary tract, usually in the kidney; urinary bladder; or the ureter.

  • Uric Acid Urolithiasis

    urolithiasis in which the composition of the stones is predominantly urate.

  • Calcium Oxalate Urolithiasis

    urolithiasis in which the composition of the stones is predominantly calcium oxalate.

Patient EducationClinical

Bladder Diseases

The bladder is a hollow organ in your lower abdomen that stores urine. Many conditions can affect your bladder. Some common ones are:

Read the full article at MedlinePlus

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Convert N20.9 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
592.9 Urinary calculus NOS
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About N20.9Overview

Is N20.9 (Calculus of kidney and ureter) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report urinary calculus, unspecified on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does N20.9 group to?

When urinary calculus, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 693, 694, with relative weights from 0.7817 to 1.3445 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of N20.9?

Under the General Equivalence Mappings, urinary calculus, unspecified converts to ICD-9-CM 592.9 (urinary calculus NOS). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.