S04.11 Injury of oculomotor nerve, right side

Name of the Condition

• Injury of oculomotor nerve, right side

Summary

Injury of the oculomotor nerve, right side, refers to damage to the third cranial nerve on the right, which controls most eye movements, pupil constriction, and eyelid elevation. This condition can result in impaired eye function, including double vision, drooping eyelid, or pupil abnormalities, and may arise from trauma, compression, or other pathological processes affecting the nerve.

Causes

Physical trauma to the head or orbit, such as from accidents or falls. Penetrating or blunt force injuries to the nerve or surrounding structures. Compression from fractures, tumors, or aneurysms. Ischemic events or vascular damage impacting the nerve's blood supply.

Risk Factors

• Participation in high-risk activities with potential head or eye trauma (e.g., contact sports, motor vehicle accidents)
• Undergoing surgical procedures near the cranial nerve pathways
• Pre-existing conditions that increase susceptibility to nerve damage (e.g., diabetes, hypertension)
• Advanced age, which may reduce nerve resilience

Symptoms

• Double vision (diplopia) due to impaired eye movement
• Drooping eyelid (ptosis) on the affected side
• Pupil dilation or abnormal light response
• Difficulty moving the eye upward, downward, or inward
• Head tilting to compensate for misaligned vision

Diagnosis

Clinical evaluation and patient history are used to assess symptoms and potential mechanisms of injury. A comprehensive eye examination, including assessment of eye movements, pupil reactivity, and eyelid position, helps identify nerve involvement. Imaging studies like MRI or CT may be performed to detect structural damage or compression.

Treatment Options

Treatment focuses on addressing the underlying cause and managing symptoms. This may include pain management, eye patching for diplopia, or surgical intervention for compressive lesions. Physical therapy or vision rehabilitation may be recommended to improve eye function and coordination.

Prognosis and Follow-Up

Prognosis depends on the severity and cause of the injury. Mild cases may resolve with conservative management, while severe or permanent damage may require ongoing care. Regular follow-up with an ophthalmologist or neurologist is important to monitor recovery and adjust treatment as needed.

Complications

Potential complications include persistent double vision, chronic ptosis, pupil abnormalities, or long-term vision impairment. In severe cases, nerve damage may lead to permanent eye movement limitations or vision loss.

Lifestyle & Prevention

Avoid activities with high risk of head or eye trauma. Use protective eyewear during sports or hazardous work. Manage underlying conditions like diabetes or hypertension to reduce nerve vulnerability. Prompt medical attention after head injuries may help prevent or mitigate nerve damage.

When to Seek Professional Help

Seek immediate medical care if you experience sudden double vision, drooping eyelid, or pupil changes after head trauma. Consult a healthcare provider for persistent eye symptoms or if vision problems worsen over time.

Tips for Medical Coders

Code S04.11 is used for injury of the oculomotor nerve on the right side. Documentation should specify the side of injury and any associated details, such as initial encounter, subsequent encounter, or sequela, to ensure accurate coding. Include clinical findings like ptosis, diplopia, or pupil abnormalities to support the diagnosis.