2026 ICD-10-CM Diagnosis Code N39.0Urinary tract infection, site not specified

ICD-10-CM Codes›N00–N99›N30-N39›N39

ICD-10-CM N39.0
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

N39.0 is a billable ICD-10-CM diagnosis code for urinary tract infection, site not specified. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 689 through 690. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Urinary tract infections.

This medical diagnosis code is frequently used in Family Practice, Internal Medicine, OB/GYN, and Pediatrics medical specialties to designate conditions such urinary tract infection, cystitis.

Code Identity

ICD-10-CM Code
N39.0
Billable Status
Yes — Valid for Submission
Code Describes
Urinary tract infection, site not specified
Short Description
Urinary tract infection, site not specified
Same as the full description in the CMS dataset.
Parent Code
N39
Other disorders of urinary system

Code Classification

ChapterN00–N99Diseases of the genitourinary system
SectionN30-N39Other diseases of the urinary system
CategoryN39Other disorders of urinary system
This CodeN39.0Urinary tract infection, site not specified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acute lower urinary tract infection
  • Acute upper urinary tract infection
  • Acute urinary tract infection
  • Bacterial urinary infection
  • Catheter-associated urinary tract infection
  • Chronic urinary tract infection
  • Coliform urinary tract infection
  • Febrile urinary tract infection
  • Infection caused by Enterococcus
  • Infection of urinary tract caused by Herpes simplex
  • Lower urinary tract infectious disease
  • Postoperative urinary tract infection
  • Proteus urinary tract infection
  • Pseudomonas aeruginosa urinary tract infection
  • Recurrent urinary tract infection
  • Sepsis due to urinary tract infection
  • Upper urinary tract infection
  • Urinary tract infection caused by Enterococcus
  • Urinary tract infection caused by Escherichia coli
  • Urinary tract infection caused by Klebsiella
  • Urinary tract infection caused by Pseudomonas
  • Urinary tract infection caused by Streptococcus agalactiae
  • Urinary tract infection following procedure
  • Urinary tract infectious disease

Tabular List NotesGuidance

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

Use Additional Code

Type 1 Excludes

  • candidiasis of urinary tract B37.4
  • neonatal urinary tract infection P39.3
  • pyuria R82.81
  • urinary tract infection of specified site, such as:
  • cystitis N30
  • pyonephrosis N13.6
  • urethritis N34

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.

    • Infection, infected, infective(opportunistic)
      • urinary (tract)
    • Pus
      • in
        • urine
    • Urine
      • pus in

Clinical ClassificationClinical

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

CCSR GEN004
Urinary tract infections
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Urinary Tract Infections

The urinary system is the body's drainage system for removing wastes and extra water. It includes two kidneys, two ureters, a bladder, and a urethra. Urinary tract infections (UTIs) are the second most common type of infection in the body.

Read the full article at MedlinePlus

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

Convert N39.0 to ICD-9-CMHistory

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

ICD-9-CM
599.0 Urin tract infection NOS
Exact Match The mapping is direct, with no qualifiers.

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 N39.0Overview

Is N39.0 (Other disorders of urinary system) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report urinary tract infection, site not specified on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does N39.0 group to?

When urinary tract infection, site not specified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 689, 690, with relative weights from 0.8095 to 1.1603 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of N39.0?

Under the General Equivalence Mappings, urinary tract infection, site not specified converts to ICD-9-CM 599.0 (urin tract infection NOS). The mapping is a direct match.

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.