2026 ICD-10-CM Diagnosis Code I45.89Other specified conduction disorders

ICD-10-CM Codes›I00–I99›I30-I5A›I45

ICD-10-CM I45.89
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

I45.89 is a billable ICD-10-CM diagnosis code for other specified conduction disorders. 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
I45.89
Billable Status
Yes — Valid for Submission
Code Describes
Other specified conduction disorders
Short Description
Other specified conduction disorders
Same as the full description in the CMS dataset.
Parent Code
I45.8
Other specified conduction disorders

Code Classification

ChapterI00–I99Diseases of the circulatory system
SectionI30-I5AOther forms of heart disease
CategoryI45Other conduction disorders
This CodeI45.89Other specified conduction disorders

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Accelerated atrioventricular conduction
  • Asymptomatic sinoatrial node dysfunction
  • Atrial premature depolarization with aberrant ventricular conduction
  • Atrial tachycardia
  • Atrioventricular conduction disorder
  • Atrioventricular dissociation
  • Atrioventricular nodal function - finding
  • AV junctional tachycardia
  • AV node arrhythmia
  • Chronotropic incompetence
  • Concealed accessory pathway
  • Dissociated atrioventricular nodal function
  • Electro-mechanical dissociation caused by cardiac pacemaker
  • Familial atrial tachyarrhythmia, infra-Hisian cardiac conduction disease
  • Familial cardiomyopathy
  • Familial dilated cardiomyopathy with conduction defect due to LMNA mutation
  • Intraventricular conduction defect
  • Malfunction from artificial pacing
  • Nodal function - finding
  • Nonparoxysmal AV nodal tachycardia
  • Progressive familial heart block
  • Progressive familial heart block, type IB
  • Pulseless electrical activity
  • Pulseless electrical activity with successful resuscitation
  • Rhythm from artificial pacing
  • Sinus node dysfunction
  • Sinus node function - finding
  • Supraventricular bigeminy

Tabular List NotesGuidance

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

Inclusion Terms

  • Atrioventricular AV dissociation
  • Interference dissociation
  • Isorhythmic dissociation
  • Nonparoxysmal AV nodal tachycardia

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.

    • Dissociation
      • auriculoventricular or atrioventricular (AV) (any degree) (isorhythmic)
    • Dissociation
      • interference
    • Incompetency, incompetent, incompetence
      • chronotropic
    • Tachycardia
      • non-paroxysmal AV nodal

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

  • Atrial Tachycardia

    a disorder characterized by an electrocardiographic finding of an organized, regular atrial rhythm with atrial rate between 101 and 240 beats per minute. the p wave morphology must be distinct from the sinus p wave morphology. (cdisc)

  • Atrial Tachycardia by ECG Finding|ATRIAL TACHYCARDIA|Atrial Tachycardia|Atrial Tachycardia by EKG Finding|Atrial tachycardia

    an electrocardiographic finding of an organized, regular atrial rhythm with atrial rate between 101 and 240 beats per minute. the p wave morphology must be distinct from the sinus p wave morphology. (cdisc)

  • Atrial Tachycardia With AV Block by ECG Finding|ATRIAL TACHYCARDIA WITH AV BLOCK

    an electrocardiographic recording that demonstrates atrial tachycardia without 1:1 atrioventricular conduction.

  • Ectopic Atrial Tachycardia

    a disorder characterized by an electrocardiographic finding of atrial tachycardia that does not originate from the sinoatrial node.

  • Grade 1 Paroxysmal Atrial Tachycardia, CTCAE|Grade 1 Paroxysmal atrial tachycardia

    asymptomatic, intervention not indicated

  • Grade 2 Paroxysmal Atrial Tachycardia, CTCAE|Grade 2 Paroxysmal atrial tachycardia

    non-urgent medical intervention indicated

  • Grade 3 Paroxysmal Atrial Tachycardia, CTCAE|Grade 3 Paroxysmal atrial tachycardia

    symptomatic, urgent intervention indicated; ablation

  • Grade 4 Paroxysmal Atrial Tachycardia, CTCAE|Grade 4 Paroxysmal atrial tachycardia

    life-threatening consequences; incompletely controlled medically; cardioversion indicated

  • Grade 5 Paroxysmal Atrial Tachycardia, CTCAE|Grade 5 Paroxysmal atrial tachycardia

    death

  • Multifocal Atrial Tachycardia by ECG Finding|MULTIFOCAL ATRIAL TACHYCARDIA|Multifocal Atrial Tachycardia|Multifocal Atrial Tachycardia by EKG Finding|Multifocal atrial tachycardia

    an electrocardiographic finding of a supraventricular arrhythmia characterized by 3 or more distinct p wave morphologies with an isoelectric baseline, variable pr intervals and no predominant atrial rhythm. the ventricular rate is typically 100-150 beats per minute. (cdisc)

  • Non-Sustained Atrial Tachycardia by ECG Finding|NON-SUSTAINED ATRIAL TACHYCARDIA|Non-Sustained Atrial Tachycardia|Non-Sustained Atrial Tachycardia|Non-Sustained Atrial Tachycardia by EKG Finding

    an electrocardiographic finding of an atrial tachycardia which terminates in less than 30 seconds. (cdisc)

  • Paroxysmal Atrial Tachycardia, CTCAE|Paroxysmal Atrial Tachycardia|Paroxysmal atrial tachycardia

    a disorder characterized by a dysrhythmia with abrupt onset and sudden termination of atrial contractions with a rate of 150-250 beats per minute. the rhythm disturbance originates in the atria.

  • Paroxysmal Atrial Tachycardia|PAT|Paroxysmal atrial tachycardia|True Paroxysmal Atrial Tachycardia

    a disorder characterized by an electrocardiographic finding of episodic atrial tachycardia with abrupt onset and termination.

  • Sinus Node Dysfunction

    a derangement in the normal functioning of the sinoatrial node. typically, sa node dysfunction is manifest as sinoatrial exit block or sinus arrest, but may present as an absolute or relative bradycardia in the presence of a stressor. it may be associated with bradycardia-tachycardia syndrome

  • Sustained Atrial Tachycardia by ECG Finding|SUSTAINED ATRIAL TACHYCARDIA

    an electrocardiographic finding of an atrial tachycardia that lasts 30 seconds or longer.

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 I45.89 to ICD-9-CMHistory

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

ICD-9-CM
426.89 Conduction disorder NEC
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 I45.89Overview

Is I45.89 (Other specified conduction disorders) a billable code?

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

What MS-DRG does I45.89 group to?

When other specified conduction disorders 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 I45.89?

Under the General Equivalence Mappings, other specified conduction disorders converts to ICD-9-CM 426.89 (conduction disorder NEC). 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.