B87.2 Ocular myiasis

Name of the Condition

• Ocular myiasis

Summary

Ocular myiasis is a parasitic infestation of the eye or surrounding tissues caused by the larvae of certain fly species. The condition occurs when flies deposit eggs or larvae near the eye, which then hatch and feed on ocular or periocular tissue. It typically presents as a localized infestation, though severity can vary based on the fly species and host factors.

Causes

Ocular myiasis is caused by the larvae of flies, such as botflies or blowflies, which deposit eggs or larvae near the eye. The larvae hatch and feed on ocular or periocular tissue, leading to infestation. Transmission often occurs through contact with contaminated environments, animals, or flies.

Risk Factors

• Poor hygiene or inadequate eye care.
• Living in or traveling to regions with high fly populations.
• Open wounds, ulcers, or lesions near the eye.
• Prolonged exposure to decaying organic matter.
• Immunocompromised states or underlying ocular conditions.

Symptoms

• Crawling or moving sensations in or around the eye.
• Visible larvae or maggots in the eye or eyelids.
• Localized pain, itching, or irritation.
• Swelling, redness, or discharge from the eye.
• Visual disturbances or blurred vision in severe cases.

Diagnosis

Diagnosis is primarily clinical, based on the presence of larvae in the eye or periocular tissue. Healthcare providers may examine the affected area, review patient history, and consider environmental exposure to flies. Imaging or laboratory tests are rarely needed but may be used to rule out other conditions.

Treatment Options

Treatment typically involves mechanical removal of larvae, often under local anesthesia. Topical or systemic antibiotics may be prescribed to prevent secondary infection. In severe cases, additional interventions, such as irrigation or surgical removal, may be necessary. Pain management and eye protection are also important.

Prognosis and Follow-Up

Prognosis is generally good with prompt treatment, though complications can occur if infestation is severe or delayed. Follow-up care may include monitoring for infection, assessing visual function, and ensuring complete larval removal. Most patients recover fully with appropriate management.

Complications

• Secondary bacterial or fungal infections.
• Corneal damage or scarring.
• Vision impairment or permanent vision loss.
• Spread of larvae to deeper ocular structures.

Lifestyle & Prevention

• Avoid exposure to flies, especially in endemic areas.
• Use protective eyewear in environments with high fly activity.
• Maintain good hygiene and promptly treat eye injuries or infections.
• Keep living spaces clean to reduce fly breeding sites.

When to Seek Professional Help

Seek immediate medical attention if you experience sudden eye pain, visible larvae, or changes in vision. Prompt evaluation is critical to prevent complications and ensure proper treatment.

Tips for Medical Coders

Code B87.2 is used for ocular myiasis. Documentation should specify the location (eye or periocular tissue) and confirm the presence of fly larvae. Include details about clinical findings, treatment, and any complications to support accurate coding. Ensure the diagnosis aligns with the clinical presentation and excludes other ocular conditions.