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    v1.0.28
    OpenPayerBilling CodesOther forms of heart diseaseICD-10-CM i45-other-conduction-disorders
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    ICD-10-CM Code For Other Conduction Disorders: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group I45 includes conduction system disorders of the heart such as sinoatrial node dysfunction, other specified conduction abnormalities, and unspecified conduction disorders that affect cardiac impulse formation or propagation. These ICD-10-CM diagnosis codes are used to document clinical scenarios involving symptomatic bradycardia, rhythm-related syncope, or electrical conduction disturbances identified on electrocardiography, capturing severity and clinical complexity. Accurate coding within the ICD-10-CM I45 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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    ICD-10-CM I45: Other Conduction Disorders Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification ICD-10-CM I45 group covers conduction system abnormalities of the heart outside of typical atrioventricular block and bundle branch block categories. These diagnoses represent disorders of the cardiac conduction pathways that can affect impulse formation or propagation and may lead to syncope, palpitations, or heart failure. Accurate coding matters because it supports complete clinical documentation and appropriate reimbursement tied to the complexity of cardiac care.

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    When to Use

    Use a code from this group when a clinician documents a specific conduction abnormality such as sinoatrial node dysfunction, symptomatic conduction disturbance, or an unspecified conduction disorder identified on electrocardiography. These codes apply when the conduction disorder is the focus of treatment, evaluation, or contributes to clinical complexity documented in the medical record.

    ICD-10-CM Codes

    11 rows

    ICD-10-CM CodeDescription
    I45.0Right fascicular block
    I45.10Unspecified right bundle-branch block
    I45.19Other right bundle-branch block
    I45.2Bifascicular block
    I45.3Trifascicular block
    I45.4Nonspecific intraventricular block
    I45.5Other specified heart block
    I45.6Pre-excitation syndrome
    I45.81Long QT syndrome
    I45.89Other specified conduction disorders
    I45.9Conduction disorder, unspecified

    DRG Codes

    5 rows

    DRG CodeDescription
    308Cardiac Arrhythmia and Conduction Disorders with MCC
    309Cardiac Arrhythmia and Conduction Disorders with CC
    310Cardiac Arrhythmia and Conduction Disorders without CC/MCC
    791Prematurity with Major Problems
    793Full Term Neonate with Major Problems

    Typical Clinical Scenarios

    • An elderly patient presents to the emergency department with lightheadedness, syncope, and palpitations that began suddenly. ECG shows new marked bradycardia with intermittent complete heart block and escape ventricular rhythm after an inferior myocardial infarction; the clinician documents an acquired atrioventricular conduction disturbance requiring temporary pacing. A diagnosis from this conduction disorder group is assigned because the primary issue is an acute AV conduction block complicating the cardiac event. Typical codes: I45.2, I45.3
    • A middle-aged outpatient with longstanding ischemic cardiomyopathy reports progressive exertional fatigue and presyncope over months; ambulatory monitoring reveals first-degree AV block and episodes of alternating bundle branch block without acute ischemia. The cardiologist documents a chronic conduction system disease as an ongoing cardiac comorbidity that affects management and device planning. Typical codes: I45.10, I45.19
    • A postoperative patient in the cardiac surgery unit develops new-onset wide complex escape rhythms and evidence of right bundle branch block after valve replacement, with persistent conduction delay but hemodynamically stable. The surgical team assigns a conduction disorder diagnosis to capture the postoperative conduction abnormality and to guide further monitoring and potential permanent pacemaker consideration. Typical codes: I45.81, I45.89

    Related Codes

    I30-ACUTE-PERICARDITIS

    ICD-10-CM Code For Acute Pericarditis: Group Overview

    I31-OTHER-DISEASES-OF-PERICARDIUM

    ICD-10-CM Code For Other Diseases Of Pericardium: Group Overview

    I32-PERICARDITIS-IN-DISEASES-CLASSIFIED-ELSEWHERE

    ICD-10-CM Code For Pericarditis In Diseases Classified Elsewhere: Group Overview

    I33-ACUTE-AND-SUBACUTE-ENDOCARDITIS

    ICD-10-CM Code For Acute And Subacute Endocarditis: Group Overview

    I34-NONRHEUMATIC-MITRAL-VALVE-DISORDERS

    ICD-10-CM Code For Nonrheumatic Mitral Valve Disorders: Group Overview

    I35-NONRHEUMATIC-AORTIC-VALVE-DISORDERS

    ICD-10-CM Code For Nonrheumatic Aortic Valve Disorders: Group Overview

    I36-NONRHEUMATIC-TRICUSPID-VALVE-DISORDERS

    ICD-10-CM Code For Nonrheumatic Tricuspid Valve Disorders: Group Overview

    I37-NONRHEUMATIC-PULMONARY-VALVE-DISORDERS

    ICD-10-CM Code For Nonrheumatic Pulmonary Valve Disorders: Group Overview

    I38-ENDOCARDITIS-VALVE-UNSPECIFIED

    ICD-10-CM Code For Endocarditis Valve Unspecified: Group Overview

    I39-ENDOCARDITIS-AND-HEART-VALVE-DISORDERS

    ICD-10-CM Code For Endocarditis And Heart Valve Disorders In Diseases Classified Elsewhere: Group Overview

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    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
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