ICD-10-CM · FY 2026 APRIL UPDATE
H49.1
Fourth [trochlear] nerve palsy
Diagnosis reference
Nonbillable categoryThis entry is a category or subcategory. Choose the appropriate billable descendant based on the clinical documentation.
Effective periodOctober 1, 2026–September 30, 2027
SourceCMS ICD-10-CM order file
ClassificationDiagnosis · clinical modification
Related entries
Up to 30 descendants in this category
| CODE | DESCRIPTION | TYPE |
|---|---|---|
| H49.10 | Fourth [trochlear] nerve palsy, unspecified eye | Billable |
| H49.11 | Fourth [trochlear] nerve palsy, right eye | Billable |
| H49.12 | Fourth [trochlear] nerve palsy, left eye | Billable |
| H49.13 | Fourth [trochlear] nerve palsy, bilateral | Billable |
Use the complete reference
This reference does not reproduce the full tabular hierarchy, inclusion notes, Excludes1/2 notes, sequencing instructions, or seventh-character rules. Review the official tables and coding guidelines.
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