Third [oculomotor] nerve palsy, unspecified eye

This code signifies a paralysis or weakness of the third cranial nerve (oculomotor nerve) affecting an unspecified eye. This nerve controls most of the eye's movements, including upward, downward, and inward gaze, as well as pupil constriction and eyelid elevation. Patients typically present with ptosis, diplopia, and a dilated pupil.

Apply this code when documentation indicates a diagnosis of third nerve palsy without specifying which eye is affected (e.g., "oculomotor nerve palsy"). This code is appropriate when laterality is unknown or not documented by the provider.

• Avoid using this code if the affected eye (right or left) is clearly documented; instead, use the more specific codes for unilateral involvement.
• Ensure the documentation supports the "unspecified" nature of the laterality.
• Consider codes for underlying causes (e.g., aneurysm, diabetes) as secondary diagnoses if documented.