H49.1 is a "category code," which means it's non-billable. Billable codes require more specificity. Use the list below to navigate to codes that are more specific:
10
H49.10
Fourth [trochlear] nerve palsy, unspecified eye
Billable
10
H49.11
Fourth [trochlear] nerve palsy, right eye
Billable
10
H49.12
Fourth [trochlear] nerve palsy, left eye
Billable
10
H49.13
Fourth [trochlear] nerve palsy, bilateral
Billable