I44.4
BillableLeft anterior fascicular block
Left anterior fascicular block
Coding Notes
Excludes 2
Conditions not included here, but the patient may have both
- •certain conditions originating in the perinatal periodP04-P96
- •certain infectious and parasitic diseasesA00-B99
- •complications of pregnancy, childbirth and the puerperiumO9A)O00
- •congenital malformations, deformations, and chromosomal abnormalitiesQ00-Q99
- •endocrine, nutritional and metabolic diseasesE00-E88
- •injury, poisoning and certain other consequences of external causesS00-T88
- •neoplasmsC00-D49
- •symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classifiedR00-R94
- •systemic connective tissue disordersM30-M36
- •transient cerebral ischemic attacks and related syndromesG45
Related Codes(7)
I44.0Atrioventricular block, first degree
I44.1Atrioventricular block, second degree
I44.2Atrioventricular block, complete
I44.3Other and unspecified atrioventricular block
I44.5Left posterior fascicular block
I44.6Other and unspecified fascicular block
I44.7Left bundle-branch block, unspecified
ICD-11 Equivalents(1)
ICD-11 Equivalents
View full mappingCorresponding ICD-11 codes from the WHO crosswalk mapping
Also Known As / Clinical Terms(53)
SNOMED CT
- Monofascicular block2374000
- RBBB - Right bundle branch block with left anterior fascicular block30667004
- Right bundle branch block AND left anterior fascicular block30667004
- Right bundle branch block with left anterior fascicular block30667004
- Right bundle branch block with left bundle branch block32758004
- Right bundle branch block with left main stem bundle branch block32758004
- LAFB - Left anterior fascicular block37760005
- Left anterior fascicular block37760005
- Left anterior hemiblock37760005
- Bifascicular block74021003
- ECG: right bundle branch block164907000
- EKG: right bundle branch block164907000
- Electrocardiographic right bundle branch block164907000
- Right bundle branch block (RBBB) on electrocardiogram164907000
- ECG: LBBB - left bundle branch block164909002
- ECG: left bundle branch block164909002
- EKG: left bundle branch block164909002
- Electrocardiographic left bundle branch block164909002
- ECG: left anterior fascicular block445118002
- Electrocardiogram: left anterior fascicular block445118002
- Left anterior fascicular block on electrocardiogram445118002
- Right bundle branch block and left anterior fascicular block on electrocardiogram445263008
- Bifascicular block on electrocardiogram445481009
UMLS
Clinical Terms
- Bifascicular block on electrocardiogram
- ECG: right bundle branch block
- ECG: left bundle branch block
- Left anterior fascicular block (disorder)
- Right bundle branch block with left bundle branch block
- Left anterior hemiblock
- RBBB - Right bundle branch block with left anterior fascicular block
- Electrocardiogram: left anterior fascicular block
- Right bundle branch block AND left anterior fascicular block
- Electrocardiographic right bundle branch block
- Left anterior fascicular block on electrocardiogram
- Right bundle branch block with left anterior fascicular block
- LAFB - Left anterior fascicular block
- Right bundle branch block (RBBB) on electrocardiogram
- ECG: left anterior fascicular block
- Bifascicular block
- EKG: left bundle branch block
- Monofascicular block
- Electrocardiographic left bundle branch block
- anterior block fascicular left
- Right bundle branch block and left anterior fascicular block on electrocardiogram
- EKG: right bundle branch block
- Right bundle branch block with left main stem bundle branch block
- ECG: LBBB - left bundle branch block
Frequently Asked Questions
What is the ICD-10 code for left anterior fascicular block?
The ICD-10-CM code for left anterior fascicular block is I44.4. The full clinical description is "Left anterior fascicular block". I44.4 is a billable/specific code that can be used on insurance claims and medical billing.
What does ICD-10 code I44.4 mean?
ICD-10-CM code I44.4 represents “Left anterior fascicular block”. It is classified under Chapter 9: Diseases of the Circulatory System and is a billable/specific code that can be used on a claim.
Is I44.4 a billable code?
Yes, I44.4 is a billable/specific ICD-10-CM code and can be used to indicate a diagnosis on a medical claim.
What chapter is I44.4 in?
I44.4 is in Chapter 9: Diseases of the Circulatory System (codes I00-I99).
What SNOMED CT codes does I44.4 map to?
I44.4 maps to 10 SNOMED CT concepts: 74021003, 445481009, 164909002, 445118002, 164907000, and 5 more. SNOMED CT is a clinical terminology used in electronic health records.
What are the UMLS CUIs for I44.4?
I44.4 is linked to 1 UMLS Concept Unique Identifier: C0264912. The UMLS (Unified Medical Language System) integrates multiple biomedical vocabularies maintained by the U.S. National Library of Medicine.
How does I44.4 relate to ICF functioning codes?
ICF (International Classification of Functioning, Disability and Health) codes describe how conditions like left anterior fascicular block affect a person's functioning — body functions, activities, participation, and environmental factors. AutoICD provides ICF Core Sets for 12+ conditions and can map clinical text to ICF categories automatically. Browse the ICF directory to explore functioning codes.
What is the ICD-11 equivalent of I44.4?
I44.4 maps to the ICD-11 code: BC63.40 (Left anterior fascicular block).
Automate ICD-10 Coding With AI
Send clinical text to the AutoICD API and get back structured ICD-10 codes with confidence scores. Integrates into any EHR or billing system in minutes.
Includes SNOMED Clinical Terms® (SNOMED CT®) used by permission of SNOMED International. Includes content from the UMLS Metathesaurus, courtesy of the U.S. National Library of Medicine.