ICD-10-CM Code I44.4
Left anterior fascicular block
Diagnosis information
Billable
Yes
Valid for claim submission
Chapter
I00–I99
Diseases of the circulatory system
Risk adjustment
None
Not risk-adjustable (V28)
More codes in the I44 category
Other billable ICD-10-CM codes in the same category as I44.4. Coding to the highest specificity the documentation supports is what keeps a claim clean — pick the child code that most precisely matches the diagnosis.
- I44.0Atrioventricular block, first degree
- I44.1Atrioventricular block, second degree
- I44.2Atrioventricular block, complete
- I44.30Unspecified atrioventricular block
- I44.39Other atrioventricular block
- I44.5Left posterior fascicular block
- I44.60Unspecified fascicular block
- I44.69Other fascicular block
- I44.7Left bundle-branch block, unspecified
Documentation & coding notes
- I44.4 is a billable/specific ICD-10-CM code — it can be reported as a primary or secondary diagnosis when the documentation supports it. Code to the highest level of specificity the record allows.
- I44.4 specifies laterality. Confirm the documented side matches the code — a laterality mismatch between the note and the claim is a frequent denial and audit target.
- Always verify the code against the current ICD-10-CM Official Guidelines and the payer's coverage policy before submitting — coverage, medical necessity edits, and sequencing rules vary by payer.
Related I00–I99 codes
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Medical coding disclaimer
ICD-10-CM codes and descriptions shown are from the CMS FY2026 official code set and HCC mappings from the CMS-HCC V28 model (payment year 2026), shown for educational reference. Official Guidelines, payer coverage, medical-necessity edits, and sequencing rules vary. Always verify with the current ICD-10-CM Official Guidelines and the payer before submitting claims. D3rx is not responsible for coding or billing outcomes.