2026 ICD-10-CM Diagnosis Code I44Atrioventricular and left bundle-branch block

ICD-10-CM Codes›I00–I99›I30-I5A›I44

ICD-10-CM I44
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

I44 is a non-billable ICD-10-CM category code for atrioventricular and left bundle-branch block, so it cannot be submitted on claims. Use a more specific code from this category instead, such as I44.0, I44.1, I44.2, and I44.30.

Code Identity

ICD-10-CM Code
I44
Billable Status
No — Non-Billable Category
Code Describes
Atrioventricular and left bundle-branch block
Chapter
I30-I5A
Other forms of heart disease

Code Classification

ChapterI00–I99Diseases of the circulatory system
SectionI30-I5AOther forms of heart disease
CategoryI44Atrioventricular and left bundle-branch block
This CodeI44Atrioventricular and left bundle-branch block

Specific Coding for Atrioventricular and left bundle-branch blockOverview

Non-specific codes like I44 require more characters. Use one of these billable codes instead:

  • Use I44.0 for Atrioventricular block, first degree

  • Use I44.1 for Atrioventricular block, second degree

  • Use I44.2 for Atrioventricular block, complete

  • I44.3 for Other and unspecified atrioventricular block

  • Use I44.30 for Unspecified atrioventricular block

  • Use I44.39 for Other atrioventricular block

  • Use I44.4 for Left anterior fascicular block

  • Use I44.5 for Left posterior fascicular block

  • I44.6 for Other and unspecified fascicular block

  • Use I44.60 for Unspecified fascicular block

  • Use I44.69 for Other fascicular block

  • Use I44.7 for Left bundle-branch block, unspecified

Patient EducationClinical

Arrhythmia

An arrhythmia is a problem with the rate or rhythm of your heartbeat. Your heart beats too quickly, too slowly, or with an irregular pattern. Changes in the electrical signals that control your heartbeat cause arrhythmias.

The full article covers:

  • What is an arrhythmia?
  • What causes an arrhythmia?
  • What are the symptoms of an arrhythmia?
  • How is an arrhythmia diagnosed?
  • What are the treatments for an arrhythmia?
  • Can arrhythmias be prevented?

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 I44Overview

Is I44 (Atrioventricular and left bundle-branch block) a billable code?

No. This is a category header that groups the codes for atrioventricular and left bundle-branch block, and headers cannot be submitted on claims. Claims for atrioventricular and left bundle-branch block need a more specific code from this category, such as I44.0, I44.1, and I44.2.