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v1.0.0
ICD-10 Guide
DiagnosesLeft Bundle Branch Block

Left Bundle Branch Block

ICD-10 Coding for Left Bundle Branch Block(I44.7)

PRIMARY SPECIALTYCardiology
COMPLEXITYHigh
LAST UPDATED09/15/2025
Sam Tuffun, PT, DPT
Physical Therapist | Medical Coding & Billing Contributor

Diagnosis Overview

What is Left Bundle Branch Block?
Essential facts and insights about Left Bundle Branch Block

Key Clinical Considerations:

  • Asymptomatic or symptoms of heart failure, syncope, or palpitations
  • ECG findings showing a widened QRS complex (>120 ms) with a characteristic pattern
  • Possible left ventricular hypertrophy on physical examination

Clinical Information

Clinical Criteria & Documentation Requirements

  • Documenting ECG findings and symptoms clearly
  • Using terms like 'left bundle branch block' or 'LBBB'
  • Examples include: 'Patient presents with LBBB on ECG' or 'Symptoms consistent with LBBB'

Coding Guidelines

Usage Guidelines & Examples

  • Follow guidelines for coding LBBB versus other types of bundle branch blocks.
  • Common errors include misclassifying LBBB as right bundle branch block.

Code Exclusions

Important Exclusions

  • Right bundle branch block, myocardial infarction
  • I44.0 (Right bundle branch block) and I25.5 (Ischemic heart disease)

Related ICD-10 Codes

Primary Codes
I44.3
Left bundle branch block
Ancillary Codes
I50.9
I44.7
if heart failure is present and contributes to LBBB.
Differential Codes
I45.2
I45.4

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Cardiology

Specialty Applications

  • Patients with cardiovascular disease, elderly populations
  • Cardiology clinics, emergency departments, inpatient settings

Coding Complexity

High Complexity

This diagnosis requires careful attention to:

  • Comprehensive clinical documentation
  • Accurate code selection based on clinical criteria
  • Proper exclusion considerations
  • Specialty-specific coding guidelines

Documentation

Documentation Templates

Billing Information

Billing Considerations

  • Ensure proper documentation for billing
  • Verify code specificity requirements
  • Check for any additional codes needed
  • Review payer-specific guidelines

Common Issues

  • Insufficient clinical documentation
  • Incorrect code selection
  • Missing supporting diagnoses
  • Timing and frequency documentation

Frequently Asked Questions

Documentation requirements?

Document ECG findings, symptoms, and any related heart conditions.

Billing considerations?

Ensure accurate coding to reflect the diagnosis and any associated conditions.