ICD-10 Code I44.60 – Unspecified fascicular block (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I44.60 – Unspecified fascicular block
What it is
I44.60 identifies a fascicular conduction block that is not further specified in the record. Use it when the documentation confirms a fascicular block but does not name the left anterior, left posterior, or another exact type.
Clinical signs
Clinical features vary; refer to documentation. Diagnosis is usually based on an electrocardiogram showing conduction delay or block in a fascicle, with no more specific fascicular subtype stated.
When to use this code
Use this code when the provider documents “fascicular block” without additional detail. It also fits when the ECG report notes a fascicular conduction abnormality and the exact fascicle is not identified.
If later documentation names the specific fascicular block, code the more precise option instead. When the record is unclear, check documentation before assigning I44.60.
Do not use for
Do not use this code for bundle branch block, AV block, or a specifically documented fascicular subtype. If the chart gives a more exact diagnosis, use that code.
Coding tip
Code I44.60 only when “unspecified” is supported by the provider’s documentation or the ECG report.