ICD-10 Code I44.1 – Atrioventricular block, second degree (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I44.1 – Atrioventricular block, second degree
What it is
I44.1 identifies second-degree atrioventricular block, a conduction disorder where some atrial impulses fail to reach the ventricles. You use it when the record clearly documents this specific type of AV block.
Clinical signs
Typical findings include intermittent dropped QRS complexes on ECG with ongoing atrial activity. Clinical features vary; refer to documentation for the exact pattern, such as Mobitz type I or type II if stated.
When to use this code
Use this code when the provider documents second-degree AV block, including when it is confirmed by ECG or rhythm strip. It also fits when the diagnosis is carried forward in the assessment and the type is not further specified. If the note names a different conduction disorder, code that condition instead.
Do not use for
Do not use I44.1 for first-degree AV block, complete AV block, or nonspecific bradycardia. Check documentation if the rhythm abnormality is described only as a pause, dropped beat, or bundle branch block.
Coding tip
Verify that the chart states second-degree AV block; if the subtype is documented, capture it elsewhere only when supported by the record.