| H49.10 | Fourth [trochlear] nerve palsy, unspecified eye | BILLABLE CODE |
| H49.11 | Fourth [trochlear] nerve palsy, right eye | BILLABLE CODE |
| H49.12 | Fourth [trochlear] nerve palsy, left eye | BILLABLE CODE |
| H49.13 | Fourth [trochlear] nerve palsy, bilateral | BILLABLE CODE |
