H49.00
Third [oculomotor] nerve palsy, unspecified eye
Clinical Classification Guidelines
Medical Intelligence & Overview
Third nerve palsy, also known as oculomotor nerve palsy, is a condition that affects the third cranial nerve, which controls most of the eye's movements, the constriction of the pupil, and the ability to focus. When this nerve is impaired, it can lead to weakness or paralysis of certain eye muscles, resulting in double vision, eyelid drooping, and misaligned eyes. The specific type addressed here is unspecified eye third nerve palsy, which means the impact on one eye has not been clearly linked to a particular eye or side.
Causes & Symptoms
Clinical Causes: Aneurysms involving the posterior communicating artery Brain tumors or mass lesions near the nerve pathway Diabetic neuropathy affecting the nerve Multiple sclerosis causing nerve inflammation Head trauma or injury Infections such as meningitis or encephalitis Vascular diseases reducing blood flow to the nerve Migraine-related neurological issues Idiopathic causes, where no specific reason is identified
Key Symptoms: Drooping eyelid (ptosis) Double vision (diplopia), especially when looking in certain directions Eye positioned down and outward due to unopposed actions of other eye muscles Difficulty focusing on objects due to impaired eye movements Pupil dilation if the parasympathetic fibers are involved Eye pain or headache in some cases Misalignment of the eyes, leading to a crossed or deviated appearance
Diagnostic & Treatment
Diagnosis Path: Diagnosing third nerve palsy involves a comprehensive eye examination, including tests of eye movement and pupil response. Additional diagnostic procedures may include imaging studies like MRI or CT scans to identify underlying causes such as aneurysms, tumors, or vascular issues. Medical history and neurological assessments are also vital to determining the origin of the nerve impairment.
Treatment Protocols: Treatment strategies depend on the underlying cause of the nerve palsy. Options can include:
Clinical Advice & FAQs
Billing Guidance
Is H49.00 a billable ICD-10 code?
Yes, H49.00 is a specific, billable code that can be used to indicate a diagnosis for reimbursement purposes.
Documentation
How do I report H49.00?
Clinical documentation must specify the nature of Third [oculomotor] nerve palsy, unspecified eye and any associated comorbidities for accurate reporting.
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