2026 ICD-10-CM Diagnosis Code N13.9Obstructive and reflux uropathy, unspecified

ICD-10-CM Codes›N00–N99›N10-N16›N13

ICD-10-CM N13.9
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

N13.9 is a billable ICD-10-CM diagnosis code for obstructive and reflux uropathy, unspecified. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 698 through 700. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified diseases of kidney and ureters.

Code Identity

ICD-10-CM Code
N13.9
Billable Status
Yes — Valid for Submission
Code Describes
Obstructive and reflux uropathy, unspecified
Short Description
Obstructive and reflux uropathy, unspecified
Same as the full description in the CMS dataset.
Parent Code
N13
Obstructive and reflux uropathy

Code Classification

ChapterN00–N99Diseases of the genitourinary system
SectionN10-N16Renal tubulo-interstitial diseases
CategoryN13Obstructive and reflux uropathy
This CodeN13.9Obstructive and reflux uropathy, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acquired obstruction of urinary tract
  • Azotemia
  • Complete obstruction of the urinary tract
  • Congenital cleft hand
  • Lower urinary tract obstructive syndrome
  • Nephropathy due to acquired urinary tract obstruction
  • Partial obstruction of urinary tract
  • Postrenal azotemia
  • Post-renal renal failure
  • Reflux of urine
  • Split hand, obstructive uropathy, spina bifida, diaphragmatic defect syndrome
  • Upper urinary tract dilatation and obstruction
  • Urinary outflow obstruction
  • Urinary tract obstruction

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Urinary tract obstruction NOS

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.

    • Obstruction, obstructed, obstructive
      • urinary (moderate)
    • Obstruction, obstructed, obstructive
      • urinary (moderate)
        • organ or tract (lower)
    • Obstruction, obstructed, obstructive
      • uropathy
    • Uropathy
      • obstructive
    • Uropathy
      • reflux

Clinical ClassificationClinical

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

CCSR GEN006
Other specified and unspecified diseases of kidney and ureters
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Azotemia

    a biochemical abnormality referring to an elevation of blood urea nitrogen and creatinine. azotemia can be produced by kidney diseases or other extrarenal disorders. when azotemia becomes associated with a constellation of clinical signs, it is termed uremia.

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

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert N13.9 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.
ICD-9-CM
593.73 Vscourtl rflx w npht NOS
Approximate The match is approximate rather than exact.
ICD-9-CM
599.60 Urinary obstruction NOS
Approximate The match is approximate rather than exact.
ICD-9-CM
599.69 Urinary obstruction NEC
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 N13.9Overview

Is N13.9 (Obstructive and reflux uropathy) a billable code?

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

What MS-DRG does N13.9 group to?

When obstructive and reflux uropathy, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 698, 699, 700, with relative weights from 0.6899 to 1.6544 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of N13.9?

Under the General Equivalence Mappings, obstructive and reflux uropathy, unspecified converts to ICD-9-CM 592.9 (urinary calculus NOS), 593.73 (vscourtl rflx w npht NOS), and 599.60 (urinary obstruction 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.