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v1.0.0
ICD-10 Guide
DiagnosesThird Degree Heart Block

Third Degree Heart Block

ICD-10 Coding for Third-Degree Heart Block(I44.2)

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

Diagnosis Overview

What is Third Degree Heart Block?
Essential facts and insights about Third-Degree Heart Block

Key Clinical Considerations:

  • Syncope or near-syncope episodes
  • Bradycardia with a heart rate typically below 40 bpm
  • Prolonged PR interval with complete dissociation between atrial and ventricular activity

Clinical Information

Clinical Criteria & Documentation Requirements

  • Patient history including symptoms and duration
  • Results of ECG showing complete heart block
  • Assessment of potential underlying causes (e.g., ischemia, medications)

Coding Guidelines

Usage Guidelines & Examples

  • Follow guidelines for coding heart block severity
  • Common errors include misclassifying the degree of block

Code Exclusions

Important Exclusions

  • First-degree heart block
  • Second-degree heart block
  • I44.0 (Atrioventricular block, unspecified)

Related ICD-10 Codes

Primary Codes
I44.2
Third-degree atrioventricular block
Ancillary Codes
Z95.8
Differential Codes
I44.1
I44.3

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Cardiology

Specialty Applications

  • Adults and children with cardiac issues
  • Emergency and outpatient 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

What are the documentation requirements?

Document clinical symptoms, ECG findings, and any treatment provided.

What are the billing considerations?

Ensure accurate coding to reflect the severity and complexity of the condition.