2021 ICD-10-CM Code I44

Atrioventricular and left bundle-branch block

Version 2021
Non-Billable Code

Not Valid for Submission

I44 is a "header" nonspecific and non-billable diagnosis code code, consider using a code with a higher level of specificity for a diagnosis of atrioventricular and left bundle-branch block. The code is NOT valid for the year 2021 for the submission of HIPAA-covered transactions. Category or Header define the heading of a category of codes that may be further subdivided by the use of 4th, 5th, 6th or 7th characters.

Short Description:Atrioventricular and left bundle-branch block
Long Description:Atrioventricular and left bundle-branch block

Code Classification

Specific Coding for Atrioventricular and left bundle-branch block

Header codes like I44 require more digits to indicate the appropriate level of specificity. Consider using any of the following ICD-10 codes with a higher level of specificity when coding for atrioventricular and left bundle-branch block:

  • I44.0 - Atrioventricular block, first degree
  • I44.1 - Atrioventricular block, second degree
  • I44.2 - Atrioventricular block, complete
  • I44.3 - Other and unspecified atrioventricular block
  • I44.30 - Unspecified atrioventricular block
  • I44.39 - Other atrioventricular block
  • I44.4 - Left anterior fascicular block
  • I44.5 - Left posterior fascicular block
  • I44.6 - Other and unspecified fascicular block
  • I44.60 - Unspecified fascicular block
  • I44.69 - Other fascicular block
  • I44.7 - Left bundle-branch block, unspecified

Information for Patients


Also called: Irregular heartbeat

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

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

[Learn More]

Code History

  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016 (First year ICD-10-CM implemented into the HIPAA code set)