2027 ICD-10-CM Diagnosis Code I49Other cardiac arrhythmias

ICD-10-CM Codes›I00–I99›I30-I5A›I49

ICD-10-CM I49
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

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

  • I49.8 for Other specified cardiac arrhythmias

  • Use I49.81 for Brugada syndrome

  • Use I49.82 for Ventricular bigeminy

  • Use I49.89 for Other specified cardiac arrhythmias not elsewhere classified

  • Use I49.9 for Cardiac arrhythmia, unspecified

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to I49: its own notes plus those printed at Chapter 9. A note printed at a category, block or chapter applies to every code under it.

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

On I49 itself
  • bradycardia NOS (R00.1)
  • neonatal dysrhythmia (P29.1-)
  • sinoatrial bradycardia (R00.1)
  • sinus bradycardia (R00.1)
  • vagal bradycardia (R00.1)
From Chapter 9 (I00-I99) Diseases of the circulatory system applies to 1,433 codes
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
  • systemic connective tissue disorders (M30-M36)
  • transient cerebral ischemic attacks and related syndromes (G45.-)

Code First

The underlying condition named in the note is sequenced before this code.

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

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name I49, its category, or a range that includes it.

Excludes2 1

These codes carry an Excludes2 note naming I49: its condition is not part of those codes, and both may be reported when the patient has both.

  • R00 Abnormalities of heart beat
    specified arrhythmias (I47-I49) names I47-I49, which includes this code

Code Also 1

These codes say I49 may also be needed to fully describe the condition. The note gives no sequencing direction.

  • M35.81 Multisystem inflammatory syndrome
    cardiac arrhythmia (I47-I49.-) names I47-I49, which includes this code

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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About I49Overview

What is the ICD-10 code for other cardiac arrhythmias?

I49 is the ICD-10-CM category for other cardiac arrhythmias, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

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.

What is coded first with I49?

The Code First note reads: cardiac arrhythmia complicating: abortion or ectopic or molar pregnancy (O00-O07, O08.8); obstetric surgery and procedures (O75.4). When one of these applies, it is sequenced before I49.