2026 ICD-10-CM Diagnosis Code I49Other cardiac arrhythmias

ICD-10-CM Codes›I00–I99›I30-I5A›I49

ICD-10-CM I49
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

I49 is a non-billable ICD-10-CM category code for other cardiac arrhythmias, so it cannot be submitted on claims. Use a more specific code from this category instead, such as I49.01, I49.02, I49.1, and I49.2.

Code Identity

ICD-10-CM Code
I49
Billable Status
No — Non-Billable Category
Code Describes
Other cardiac arrhythmias
Short Description
Other cardiac arrhythmias
Same as the full description in the CMS dataset.
Chapter
I30-I5A
Other forms of heart disease

Code Classification

ChapterI00–I99Diseases of the circulatory system
SectionI30-I5AOther forms of heart disease
CategoryI49Other cardiac arrhythmias
This CodeI49Other cardiac arrhythmias

Specific Coding for Other cardiac arrhythmiasOverview

Non-specific codes like I49 require more characters. Use one of these billable codes instead:

  • I49.0 for Ventricular fibrillation and flutter

  • Use I49.01 for Ventricular fibrillation

  • Use I49.02 for Ventricular flutter

  • Use I49.1 for Atrial premature depolarization

  • Use I49.2 for Junctional premature depolarization

  • Use I49.3 for Ventricular premature depolarization

  • I49.4 for Other and unspecified premature depolarization

  • Use I49.40 for Unspecified premature depolarization

  • Use I49.49 for Other premature depolarization

  • Use I49.5 for Sick sinus syndrome

  • Use I49.8 for Other specified cardiac arrhythmias

  • Use I49.9 for Cardiac arrhythmia, unspecified

Tabular List NotesGuidance

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

Code First

  • cardiac arrhythmia complicating:
  • abortion or ectopic or molar pregnancy O00 O07 O08.8
  • obstetric surgery and procedures O75.4

Type 2 Excludes

  • bradycardia NOS R00.1
  • neonatal dysrhythmia P29.1
  • sinoatrial bradycardia R00.1
  • sinus bradycardia R00.1
  • vagal bradycardia R00.1

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 I49Overview

Is I49 (Other cardiac arrhythmias) a billable code?

No. This is a category header that groups the codes for other cardiac arrhythmias, and headers cannot be submitted on claims. Claims for other cardiac arrhythmias need a more specific code from this category, such as I49.01, I49.02, and I49.1.