| I44 | Atrioventricular and left bundle-branch block | NON-BILLABLE CODE |
| I44.0 | Atrioventricular block, first degree | BILLABLE CODE |
| I44.1 | Atrioventricular block, second degree | BILLABLE CODE |
| I44.2 | Atrioventricular block, complete | BILLABLE CODE |
| I44.3 | Other and unspecified atrioventricular block | NON-BILLABLE CODE |
| I44.39 | Other atrioventricular block | BILLABLE CODE |
| I44.4 | Left anterior fascicular block | BILLABLE CODE |
| I44.5 | Left posterior fascicular block | BILLABLE CODE |
| I44.6 | Other and unspecified fascicular block | NON-BILLABLE CODE |
| I44.60 | Unspecified fascicular block | BILLABLE CODE |
| I44.69 | Other fascicular block | BILLABLE CODE |
| I44.7 | Left bundle-branch block, unspecified | BILLABLE CODE |
