ICD-10 Code H49.01 – Third [oculomotor] nerve palsy, right eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H49.01 – Third [oculomotor] nerve palsy, right eye
What it is
H49.01 identifies paralysis or weakness of the right oculomotor nerve. This nerve helps control most eye movements, eyelid elevation, and pupil constriction.
Clinical signs
Typical findings include diplopia, ptosis, and impaired eye movement on the right side. The eye may rest in a “down and out” position; clinical features vary, so refer to documentation.
When to use this code
Use H49.01 when the provider documents right third nerve palsy, oculomotor nerve palsy, or equivalent wording affecting the right eye. Code it when the diagnosis is confirmed or clearly stated in the record. Check documentation if laterality is unclear or if another cause is the primary documented condition.
Do not use for
Do not use this code for unspecified third nerve palsy, left eye palsy, or bilateral involvement. Do not use it when the record only describes diplopia or ptosis without a documented oculomotor nerve palsy.
Coding tip
Always verify laterality in the assessment, because H49.01 is specific to the right eye.