ICD-10-CM Code I49.8

Other specified cardiac arrhythmias

Version 2020 Billable Code Cardiology

Valid for Submission

I49.8 is a billable code used to specify a medical diagnosis of other specified cardiac arrhythmias. The code is valid for the year 2020 for the submission of HIPAA-covered transactions. The ICD-10-CM code I49.8 might also be used to specify conditions or terms like ankyrin-b syndrome, antidromic atrioventricular re-entrant tachycardia, atrial arrhythmia, atrial escape complex, atrial rhythm, atrioventricular tachycardia, etc

The code is commonly used in cardiology medical specialties to specify clinical concepts such as cardiac arrhythmias (other).

Short Description:Other specified cardiac arrhythmias
Long Description:Other specified cardiac arrhythmias

Tabular List of Diseases and Injuries

The Tabular List of Diseases and Injuries is a list of ICD-10 codes, organized "head to toe" into chapters and sections with guidance for inclusions, exclusions, descriptions and more. The following references are applicable to the code I49.8:

Inclusion Terms

Inclusion Terms
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
  • Brugada syndrome
  • Coronary sinus rhythm disorder
  • Ectopic rhythm disorder
  • Nodal rhythm disorder

Index to Diseases and Injuries

The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10 code(s). The following references for the code I49.8 are found in the index:


The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

  • Ankyrin-B syndrome
  • Antidromic atrioventricular re-entrant tachycardia
  • Atrial arrhythmia
  • Atrial escape complex
  • Atrial rhythm
  • Atrioventricular tachycardia
  • Atrioventricular tachycardia
  • AV junctional arrest
  • AV junctional rhythm
  • AV node arrhythmia
  • AV-junctional bradycardia
  • Bradyarrhythmia
  • Brugada syndrome
  • Chronic atrial and intestinal dysrhythmia
  • Chronic intestinal pseudo-obstruction
  • Ectopic rhythm
  • Finding related to awareness of heart beat
  • Fluttering heart
  • Genetic short QT syndrome
  • Left atrial rhythm
  • Marked sinus arrhythmia
  • Nodal rhythm disorder
  • Orthodromic atrioventricular re-entrant tachycardia
  • Palpitations
  • Phocomelia
  • Phocomelia, ectrodactyly, deafness and sinus arrhythmia syndrome
  • Postoperative fluttering heart
  • Progressive encephalopathy with edema, hypsarrhythmia and optic atrophy syndrome
  • Progressive encephalopathy with edema, hypsarrhythmia, and optic atrophy-like syndrome
  • Re-entrant atrioventricular node tachycardia
  • Re-entrant atrioventricular tachycardia
  • Second cranial nerve finding
  • Short QT syndrome
  • Short QT syndrome
  • Sick sinus syndrome
  • Slow ventricular response
  • Supraventricular bradyarrhythmia
  • Tic-tac rhythm
  • Ventricular escape complex
  • Wandering atrial pacemaker

Diagnostic Related Groups

The ICD-10 code I49.8 is grouped in the following groups for version MS-DRG V37.0 What are Diagnostic Related Groups?
The Diagnostic Related Groups (DRGs) are a patient classification scheme which provides a means of relating the type of patients a hospital treats. The DRGs divides all possible principal diagnoses into mutually exclusive principal diagnosis areas referred to as Major Diagnostic Categories (MDC).
applicable from 10/01/2019 through 09/30/2020.


Convert I49.8 to ICD-9

  • 427.89 - Cardiac dysrhythmias NEC (Approximate Flag)

Code Classification

  • Diseases of the circulatory system (I00–I99)
    • Other forms of heart disease (I30-I52)
      • Other cardiac arrhythmias (I49)

Code History

  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016
    (First year ICD-10-CM implemented into the HIPAA code set)
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020

Information for Patients


An arrhythmia is a problem with the rate or rhythm of your heartbeat. It means that your heart beats too quickly, too slowly, or with an irregular pattern. When the heart beats faster than normal, it is called tachycardia. When the heart beats too slowly, it is called bradycardia. The most common type of arrhythmia is atrial fibrillation, which causes an irregular and fast heart beat.

Many factors can affect your heart's rhythm, such as having had a heart attack, smoking, congenital heart defects, and stress. Some substances or medicines may also cause arrhythmias.

Symptoms of arrhythmias include

  • Fast or slow heart beat
  • Skipping beats
  • Lightheadedness or dizziness
  • Chest pain
  • Shortness of breath
  • Sweating

Your doctor can run tests to find out if you have an arrhythmia. Treatment to restore a normal heart rhythm may include medicines, an implantable cardioverter-defibrillator (ICD) or pacemaker, or sometimes surgery.

NIH: National Heart, Lung, and Blood Institute

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