ICD-10 Code H49.02 – Third [oculomotor] nerve palsy, left eye (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code H49.02 – Third [oculomotor] nerve palsy, left eye
What it is
H49.02 identifies paralysis or weakness of the left oculomotor nerve. This nerve helps control most eye movements, eyelid elevation, and pupil function.
Clinical signs
Typical findings include left ptosis, impaired eye movement, and diplopia. The eye may rest “down and out”; clinical features vary, so refer to documentation.
When to use this code
Use H49.02 when the clinician documents left third nerve palsy, oculomotor nerve palsy, or equivalent wording. It may apply after trauma, compression, ischemia, or other identified causes if the left eye is specified. If laterality is not documented, check documentation.
Do not use for
Do not use this code for unspecified third nerve palsy or for right eye involvement. Avoid it when the record describes another cranial nerve disorder or a general diplopia diagnosis without oculomotor palsy.
Coding tip
Confirm laterality in the note; H49.02 is only for left eye third nerve palsy.