2026 ICD-10-CM Diagnosis Code I34Nonrheumatic mitral valve disorders

ICD-10-CM Codes›I00–I99›I30-I5A›I34

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

I34 is a non-billable ICD-10-CM category code for nonrheumatic mitral valve disorders, so it cannot be submitted on claims. Use a more specific code from this category instead, such as I34.0, I34.1, I34.2, and I34.81.

This medical diagnosis code is frequently used in Cardiology medical specialties to designate conditions such nonrheumatic valve disorders - mitral valve disorders.

Code Identity

ICD-10-CM Code
I34
Billable Status
No — Non-Billable Category
Code Describes
Nonrheumatic mitral valve disorders
Chapter
I30-I5A
Other forms of heart disease

Code Classification

ChapterI00–I99Diseases of the circulatory system
SectionI30-I5AOther forms of heart disease
CategoryI34Nonrheumatic mitral valve disorders
This CodeI34Nonrheumatic mitral valve disorders

Specific Coding for Nonrheumatic mitral valve disordersOverview

Non-specific codes like I34 require more characters. Use one of these billable codes instead:

  • Use I34.0 for Nonrheumatic mitral (valve) insufficiency

  • Use I34.1 for Nonrheumatic mitral (valve) prolapse

  • Use I34.2 for Nonrheumatic mitral (valve) stenosis

  • I34.8 for Other nonrheumatic mitral valve disorders

  • Use I34.81 for Nonrheumatic mitral (valve) annulus calcification

  • Use I34.89 for Other nonrheumatic mitral valve disorders

  • Use I34.9 for Nonrheumatic mitral valve disorder, unspecified

Tabular List NotesGuidance

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

Type 1 Excludes

  • mitral valve disease I05.9
  • mitral valve failure I05.8
  • mitral valve stenosis I05.0
  • mitral valve disorder of unspecified cause with diseases of aortic and/or tricuspid valves I08
  • mitral valve disorder of unspecified cause with mitral stenosis or obstruction I05.0
  • mitral valve disorder specified as congenital Q23.2 Q23.9
  • mitral valve disorder specified as rheumatic I05

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 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 I34Overview

Is I34 (Nonrheumatic mitral valve disorders) a billable code?

No. This is a category header that groups the codes for nonrheumatic mitral valve disorders, and headers cannot be submitted on claims. Claims for nonrheumatic mitral valve disorders need a more specific code from this category, such as I34.0, I34.1, and I34.2.