Injury to oculomotor nerve

This code describes damage or trauma affecting the third cranial nerve, which controls most eye movements and pupillary constriction. Injury to the oculomotor nerve can result in symptoms such as ptosis, diplopia, and a dilated pupil.

Use this code when documentation clearly indicates an injury, lesion, or dysfunction specifically impacting the oculomotor nerve. This applies to cases of traumatic injury, compression, or other direct damage to the nerve. Supporting documentation should include physician notes detailing the cause and clinical manifestations of the oculomotor nerve injury.

• Differentiate from other cranial nerve palsies; ensure the documentation specifies the oculomotor nerve (CN III).
• Code the underlying cause of the injury (e.g., fracture, intracranial hemorrhage) first, if applicable, followed by this code.
• Avoid using this code for congenital or developmental anomalies of the oculomotor nerve; those would fall under different ICD-9 categories.