H49.12: Fourth [trochlear] nerve palsy, left eye
H49.12 is the billable ICD-10-CM diagnosis code for Fourth [trochlear] nerve palsy, left eye. It is a fully specified code, so it can be reported on a claim (subject to clinical documentation and your payer's rules).
Frequently asked questions
What is ICD-10-CM code H49.12?
H49.12 is the ICD-10-CM diagnosis code for Fourth [trochlear] nerve palsy, left eye. It belongs to category H49 (Paralytic strabismus).
Is H49.12 a billable code?
Yes. H49.12 is a billable, fully specified ICD-10-CM code, so it can be used on a claim (subject to documentation and payer rules).
What category does H49.12 belong to?
H49.12 is part of ICD-10-CM category H49 — Paralytic strabismus, which has 58 billable codes.
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Informational only, not coding or medical advice. Verify against the official ICD-10-CM (FY2026) and your payer's guidelines.
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