2026 ICD-10-CM Diagnosis Code I34.89Other nonrheumatic mitral valve disorders

ICD-10-CM Codes›I00–I99›I30-I5A›I34

ICD-10-CM I34.89
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

I34.89 is a billable ICD-10-CM diagnosis code for other nonrheumatic mitral valve disorders. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 306 through 307. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Nonrheumatic and unspecified valve disorders.

Code Identity

ICD-10-CM Code
I34.89
Billable Status
Yes — Valid for Submission
Code Describes
Other nonrheumatic mitral valve disorders
Short Description
Other nonrheumatic mitral valve disorders
Same as the full description in the CMS dataset.
Parent Code
I34.8
Other nonrheumatic mitral valve disorders

Code Classification

ChapterI00–I99Diseases of the circulatory system
SectionI30-I5AOther forms of heart disease
CategoryI34Nonrheumatic mitral valve disorders
This CodeI34.89Other nonrheumatic mitral valve disorders

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Abnormality of mitral chordae tendinae
  • Abnormality of mitral valve annulus
  • Abscess of mitral valve
  • Acquired abnormality of mitral subvalvular apparatus
  • Arcade abnormality of mitral chordae tendinae
  • Bacterial abscess of mitral valve
  • Calcification of mitral valve
  • Circular mitral valve orifice
  • Complex mitral valve orifice
  • Congenital dysplasia of cardiac valve
  • Deficiency of mitral leaflet
  • Dilation of mitral annulus
  • Discontinuity between mitral valve and aortic valve
  • Fenestration of mitral leaflet
  • Fusion of mitral valve cusps
  • Irregular mitral valve orifice
  • Ischemic mitral valve dysfunction
  • Masses on mitral apparatus
  • Mitral chordae tendinae too long
  • Mitral chordae tendinae too short
  • Mitral leaflet dysplasia
  • Mitral regurgitation due to acquired abnormality of mitral subvalvular apparatus
  • Mitral sub-valve apparatus calcification
  • Mitral valve dysplasia
  • Multiple mitral valve orifice
  • Myxoid transformation of cardiac valve
  • Myxoid transformation of mitral valve
  • Perforation of mitral valve leaflet
  • Slit-like mitral valve orifice
  • Systolic anterior movement of mitral valve
  • Thickened mitral leaflet
  • Thrombosis of mitral valve
  • Torn mitral leaflet

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.

    • Aneurysm(anastomotic) (artery) (cirsoid) (diffuse) (false) (fusiform) (multiple) (saccular)
      • mitral (heart) (valve)
    • Atheroma, atheromatous
      • mitral (valve)
    • Endocarditis(chronic) (marantic) (nonbacterial) (thrombotic) (valvular)
      • mitral (chronic) (double) (fibroid) (heart) (inactive) (valve) (with chorea)
        • arteriosclerotic
    • Endocarditis(chronic) (marantic) (nonbacterial) (thrombotic) (valvular)
      • mitral (chronic) (double) (fibroid) (heart) (inactive) (valve) (with chorea)
        • nonrheumatic
    • Rupture, ruptured
      • mitral (valve)
    • Thrombosis, thrombotic(bland) (multiple) (progressive) (silent) (vessel)
      • mitral

Clinical ClassificationClinical

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

CCSR CIR003
Nonrheumatic and unspecified valve disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Heart Valve Diseases

Heart valve disease happens when one or more of your heart valves don't work well.

The full article covers:

  • What are heart valve diseases?
  • What are the types of heart valve diseases?
  • What causes heart valve diseases?
  • Who is more likely to develop heart valve diseases?
  • What are the symptoms of heart valve diseases?
  • What other problems can heart valve diseases cause?
  • How is heart valve disease diagnosed?
  • What are the treatments for heart valve diseases?

Read the full article at MedlinePlus

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

Code History & ChangesHistory

Replacement I34.89 replaces the following previously assigned code(s):

  • I34.8 - Other nonrheumatic mitral valve disorders
FY 2023AddedAdded to the ICD-10-CM code setEffective October 1, 2022.
FY 2024–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About I34.89Overview

Is I34.89 (Other nonrheumatic mitral valve disorders) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other nonrheumatic mitral valve disorders on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does I34.89 group to?

When other nonrheumatic mitral valve disorders is the principal diagnosis on an inpatient stay, it groups to MS-DRG 306, 307, with relative weights from 0.9132 to 1.5758 depending on complications. Higher weights mean higher Medicare reimbursement.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.