I44: Atrioventricular and left bundle-branch block
Codes under I44 (Atrioventricular and left bundle-branch block). A ✓ marks a billable (fully specified) code; category codes without a ✓ are not billable on their own.
| Code | Description | Billable |
|---|---|---|
| I44.0 | Atrioventricular block, first degree | ✓ |
| I44.0 | Atrioventricular block, first degree | ✓ |
| I44.1 | Atrioventricular block, second degree | ✓ |
| I44.1 | Atrioventricular block, second degree | ✓ |
| I44.2 | Atrioventricular block, complete | ✓ |
| I44.2 | Atrioventricular block, complete | ✓ |
| I44.3 | Other and unspecified atrioventricular block | — |
| I44.3 | Other and unspecified atrioventricular block | — |
| I44.4 | Left anterior fascicular block | ✓ |
| I44.4 | Left anterior fascicular block | ✓ |
| I44.5 | Left posterior fascicular block | ✓ |
| I44.5 | Left posterior fascicular block | ✓ |
| I44.6 | Other and unspecified fascicular block | — |
| I44.6 | Other and unspecified fascicular block | — |
| I44.7 | Left bundle-branch block, unspecified | ✓ |
| I44.7 | Left bundle-branch block, unspecified | ✓ |
| I44.30 | Unspecified atrioventricular block | ✓ |
| I44.30 | Unspecified atrioventricular block | ✓ |
| I44.39 | Other atrioventricular block | ✓ |
| I44.39 | Other atrioventricular block | ✓ |
| I44.60 | Unspecified fascicular block | ✓ |
| I44.60 | Unspecified fascicular block | ✓ |
| I44.69 | Other fascicular block | ✓ |
| I44.69 | Other fascicular block | ✓ |
Frequently asked questions
What is ICD-10-CM code I44?
I44 is an ICD-10-CM category covering Atrioventricular and left bundle-branch block. It contains 24 more specific diagnosis codes, 20 of which are billable.
Is I44 a billable code?
No — I44 is a category header and isn't billable on its own. Code to the highest level of specificity using one of its subcodes (for example I44.0 — Atrioventricular block, first degree). 20 of the 24 codes under I44 are billable.
What codes fall under I44?
I44 includes I44.0, I44.0, I44.1, I44.1, I44.2, plus 19 more. See the full list with descriptions and billable status above.
More free billing tools: all ICD-10 categories · ICD-10 search · denial codes · Medicare fees
Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
Code the diagnosis right
Join providers across the country delivering modern virtual care with CareNiva. Free to start, ready in minutes.
100% Satisfaction Guaranteed — try it risk-free