H34.11 Central retinal artery occlusion, right eye

Name of the Condition

• Central Retinal Artery Occlusion, Right Eye

Summary

Central retinal artery occlusion (CRAO) is a blockage of the central retinal artery, which supplies blood to the retina. This blockage disrupts blood flow and can lead to sudden, painless vision loss in the affected eye. The condition is a medical emergency due to the risk of permanent retinal damage and vision impairment.

Causes

CRAO is typically caused by an embolus (e.g., from atherosclerotic plaque or cardiac sources) or thrombus blocking the central retinal artery. Other contributing factors may include vasospasm, inflammatory conditions, or trauma to the artery.

Risk Factors

• Advanced age
• Hypertension
• Atherosclerosis
• Cardiovascular disease
• Diabetes mellitus
• High cholesterol
• Smoking
• Hypercoagulable states
• Carotid artery disease

Symptoms

• Sudden, painless vision loss in the right eye
• Reduced visual acuity (e.g., "blacking out" or "fogging" of vision)
• Visual field defects (e.g., altitudinal or sectoral loss)
• Relative afferent pupillary defect (RAPD) in the right eye

Diagnosis

Diagnosis involves a comprehensive eye examination, including visual acuity testing, dilated funduscopy (to assess retinal whitening, cherry-red spot, or arterial narrowing), and imaging studies such as fluorescein angiography or optical coherence tomography (OCT) to evaluate retinal perfusion and structure.

Treatment Options

Treatment focuses on restoring blood flow and managing underlying causes. Options may include ocular massage, anterior chamber paracentesis, or systemic therapies (e.g., thrombolytics, vasodilators). Long-term management addresses risk factors like hypertension or hyperlipidemia.

Prognosis and Follow-Up

Prognosis depends on the duration of occlusion and promptness of treatment. Vision may improve with early intervention, but permanent loss is possible. Follow-up includes regular eye exams to monitor for complications and systemic evaluations to address underlying conditions.

Complications

• Permanent vision loss or blindness
• Retinal ischemia or infarction
• Neovascularization of the iris or retina
• Secondary glaucoma

Lifestyle & Prevention

• Control hypertension, diabetes, and cholesterol
• Avoid smoking and manage cardiovascular health
• Seek prompt care for transient vision changes
• Maintain regular eye exams, especially with risk factors

When to Seek Professional Help

Seek immediate medical attention for sudden, painless vision loss in the right eye, as delays can worsen outcomes. Emergency care is critical to preserve retinal function.

Tips for Medical Coders

Document the affected eye (right eye) clearly in the medical record. Ensure the diagnosis aligns with clinical findings, such as fundoscopic evidence of retinal whitening or a cherry-red spot. Code H34.11 is specific to the right eye; verify laterality and exclude bilateral or unspecified eye codes.