Left anterior fascicular block
ICD-10 I44.4 is a billable code used to indicate a diagnosis of left anterior fascicular block.
Left anterior fascicular block (LAFB) is a type of intraventricular conduction delay characterized by a blockage in the left anterior fascicle of the left bundle branch. This condition affects the electrical conduction system of the heart, leading to altered depolarization patterns. Clinically, patients may present with nonspecific symptoms such as palpitations, syncope, or may be asymptomatic. The anatomy involved includes the left bundle branch, which divides into anterior and posterior fascicles; LAFB specifically affects the anterior fascicle. Disease progression can vary, with some patients remaining stable while others may develop more significant conduction disturbances or underlying heart disease. Diagnostic considerations include electrocardiogram (ECG) findings, which typically show a left axis deviation and a QRS duration of less than 120 ms. It is essential to differentiate LAFB from other conduction blocks and conditions such as left bundle branch block (LBBB) or myocardial infarction, which may present similarly on an ECG.
Standard ICD-10-CM documentation requirements apply
Various clinical presentations within this specialty area
Follow specialty-specific billing guidelines
Standard ICD-10-CM documentation requirements apply
Various clinical presentations within this specialty area
Follow specialty-specific billing guidelines
I44.4 specifically covers left anterior fascicular block, which may occur in isolation or in conjunction with other cardiac conditions such as hypertension or coronary artery disease.
I44.4 should be used when there is clear evidence of left anterior fascicular block on ECG, differentiating it from other blocks like I44.0 or I45.19, which may not specify the fascicular involvement.
Documentation should include an ECG report indicating left axis deviation and any clinical symptoms or history that support the diagnosis of left anterior fascicular block.
