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Home/Diagnosis/ICD-10 Coding for Left Anterior Fascicular Block

ICD-10 Coding for Left Anterior Fascicular Block

I44.4
I45.2

Complete ICD-10-CM coding and documentation guide for icd-10 coding for left anterior fascicular block includes clinical validation requirements, medical necessity guidelines, and coding policies.

Also Known as:
LAFB
Left Anterior Hemiblock
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Key Information: ICD-10 Coding for Left Anterior Fascicular Block

Essential facts and insights about ICD-10 Coding for Left Anterior Fascicular Block

Use ICD-10 code I44.4 for left anterior fascicular block, ensuring proper documentation in clinical notes.

Primary ICD-10-CM Codes

Left anterior fascicular block

Billable Code
I44.4
Billable

Diagnostic Criteria

clinical_criteria:
  • • ECG shows left axis deviation between -45° and -90°
coding_criteria:
  • • Use I44.4 only if LAFB is isolated without RBBB.

Applicable To

  • • Isolated left anterior fascicular block

Important Notes

  • • Ensure ECG findings are documented to support LAFB diagnosis.

Bifascicular block

Billable Code
I45.2
Billable

Diagnostic Criteria

clinical_validation_requirements:
  • • ECG shows RBBB + LAD (-45° to -90°), rS in II/III/aVF, qR in I/aVL

Applicable To

  • • LAFB with RBBB

Important Notes

  • • Ensure documentation reflects both RBBB and LAFB.
Ancillary Codes

Additional codes that may be used with this diagnosis

Z86.79

Personal history of other diseases of the circulatory system

Use when documenting a history of LAFB without current symptoms.

Frequently Asked Questions

What is the ICD-10 code for left anterior fascicular block?

The ICD-10 code for left anterior fascicular block is I44.4, used when LAFB is the sole conduction defect.

When should I use ICD-10 code I45.2?

Use ICD-10 code I45.2 for bifascicular block when LAFB is present with right bundle branch block (RBBB).

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