2026 ICD-10-CM Diagnosis Code N30.31Trigonitis with hematuria

ICD-10-CM Codes›N00–N99›N30-N39›N30

ICD-10-CM N30.31
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

N30.31 is a billable ICD-10-CM diagnosis code for trigonitis with hematuria. 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. Coders also document this condition as cystitis associated with another disorder. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Hematuria and 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
N30.31
Billable Status
Yes — Valid for Submission
Code Describes
Trigonitis with hematuria
Short Description
Trigonitis with hematuria
Same as the full description in the CMS dataset.
Parent Code
N30.3
Trigonitis

Code Classification

ChapterN00–N99Diseases of the genitourinary system
SectionN30-N39Other diseases of the urinary system
CategoryN30Cystitis
This CodeN30.31Trigonitis with hematuria

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Cystitis associated with another disorder
  • Hematuria co-occurrent and due to cystitis
  • Hematuria co-occurrent and due to trigonitis
  • Trigonitis

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.

    • Cystitis(exudative) (hemorrhagic) (septic) (suppurative)
      • acute
        • of trigone
          • with hematuria
    • Cystitis(exudative) (hemorrhagic) (septic) (suppurative)
      • chronic
        • of trigone
          • with hematuria
    • Cystitis(exudative) (hemorrhagic) (septic) (suppurative)
      • of trigone
        • with hematuria
    • Trigonitis(bladder) (chronic) (pseudomembranous)
      • with hematuria

Clinical ClassificationClinical

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

CCSR GEN009
Hematuria
Default principal diagnosis: inpatient No · outpatient No
CCSR GEN004
Urinary tract infections
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Trigonitis

    inflammation of the trigone of the urinary bladder.

  • Urethrotrigonitis

    inflammation of both the urethra and the trigone of the urinary bladder.

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 N30.31 to ICD-9-CMHistory

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

ICD-9-CM
595.3 Trigonitis
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 N30.31Overview

Is N30.31 (Trigonitis) a billable code?

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

What MS-DRG does N30.31 group to?

When trigonitis with hematuria 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 N30.31?

Under the General Equivalence Mappings, trigonitis with hematuria converts to ICD-9-CM 595.3 (trigonitis). 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.