2026 ICD-10-CM Diagnosis Code I44.2Atrioventricular block, complete

ICD-10-CM Codes›I00–I99›I30-I5A›I44

ICD-10-CM I44.2
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

I44.2 is a billable ICD-10-CM diagnosis code for atrioventricular block, complete. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 308 through 310. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Conduction disorders.

Code Identity

ICD-10-CM Code
I44.2
Billable Status
Yes — Valid for Submission
Code Describes
Atrioventricular block, complete
Short Description
Atrioventricular block, complete
Same as the full description in the CMS dataset.
Parent Code
I44
Atrioventricular and left bundle-branch block

Code Classification

ChapterI00–I99Diseases of the circulatory system
SectionI30-I5AOther forms of heart disease
CategoryI44Atrioventricular and left bundle-branch block
This CodeI44.2Atrioventricular block, complete

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Accelerated idioventricular rhythm
  • Acquired complete atrioventricular block
  • Agonal rhythm
  • Complete atrioventricular block
  • Complete atrioventricular block as complication of atrioventricular nodal ablation
  • ECG: idioventricular rhythm
  • EKG: complete atrioventricular block
  • Fusion beats
  • Idioventricular rhythm
  • Lev's syndrome
  • Parasystole
  • Postoperative atrioventricular block
  • Postoperative cardiac arrhythmia
  • Postoperative complete heart block
  • Progressive familial heart block
  • Ventricular escape beat
  • Ventricular escape rhythm
  • Ventricular parasystole

Tabular List NotesGuidance

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

Inclusion Terms

  • Complete heart block NOS
  • Third degree block

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Block, blocked
      • atrioventricular (incomplete) (partial)
        • with atrioventricular dissociation
    • Block, blocked
      • atrioventricular (incomplete) (partial)
        • complete
    • Block, blocked
      • atrioventricular (incomplete) (partial)
        • third degree
    • Block, blocked
      • conduction
        • complete
    • Block, blocked
      • heart
        • complete (atrioventricular)
    • Block, blocked
      • heart
        • third degree (atrioventricular)
    • Block, blocked
      • third degree
    • Disease, diseased
      • Lenegre's
    • Disease, diseased
      • Lev's (acquired complete heart block)
    • Dissociation
      • auriculoventricular or atrioventricular (AV) (any degree) (isorhythmic)
        • with heart block
    • Lenegre's disease
    • Lev's disease or syndrome(acquired complete heart block)
    • Rhythm
      • idioventricular
    • Rytand-Lipsitch syndrome
    • Syndrome
      • Lev's
    • Syndrome
      • Rytand-Lipsitch

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR CIR016
Conduction disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Parasystole

    a cardiac arrhythmia that is caused by interaction of two independently initiated cardiac impulses of different rates from two separate foci. generally one focus is the sinoatrial node, the normal pacemaker. the ectopic focus is usually in the heart ventricle but can be in the heart atrium or the atrioventricular node. modulation of the parasystolic rhythm by the sinus rhythm depends on the completeness of entrance block surrounding the parasystolic focus.

  • Accelerated Idioventricular Rhythm

    a type of automatic, not reentrant, ectopic ventricular rhythm with episodes lasting from a few seconds to a minute which usually occurs in patients with acute myocardial infarction or with digitalis toxicity. the ventricular rate is faster than normal but slower than tachycardia, with an upper limit of 100 -120 beats per minute. suppressive therapy is rarely necessary.

  • Digitalis

    a genus of toxic herbaceous eurasian plants of the plantaginaceae which yield cardiotonic digitalis glycosides. the most useful species are digitalis lanata and d. purpurea.

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.

Convert I44.2 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
426.0 Atriovent block complete
Exact Match The mapping is direct, with no qualifiers.

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 I44.2Overview

Is I44.2 (Atrioventricular and left bundle-branch block) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report atrioventricular block, complete on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does I44.2 group to?

When atrioventricular block, complete is the principal diagnosis on an inpatient stay, it groups to MS-DRG 308, 309, 310, with relative weights from 0.5661 to 1.2040 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of I44.2?

Under the General Equivalence Mappings, atrioventricular block, complete converts to ICD-9-CM 426.0 (atriovent block complete). The mapping is a direct match.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.