B87.82 Intestinal myiasis

Name of the Condition

• Intestinal myiasis

Summary

Intestinal myiasis is a parasitic infestation involving live fly larvae (maggots) in the gastrointestinal tract. The condition occurs when flies deposit eggs or larvae in the intestinal system, which then hatch and feed on the host's tissue. It may affect structures such as the stomach, small intestine, or large intestine, with severity varying by fly species and host factors.

Causes

Intestinal myiasis is caused by the larvae of certain fly species, which deposit eggs or larvae in the gastrointestinal tract. The larvae hatch and feed on the host's tissue, leading to infestation. Transmission typically occurs through ingestion of contaminated food or water containing fly eggs or larvae, with larvae targeting the mucosal lining of the intestines.

Risk Factors

• Poor hygiene or inadequate food/water sanitation.
• Living in or traveling to regions with high fly populations.
• Consumption of raw or undercooked food.
• Prolonged exposure to environments with decaying organic matter.
• Immunocompromised states or pre-existing gastrointestinal conditions.

Symptoms

• Abdominal pain, cramping, or discomfort.
• Nausea, vomiting, or diarrhea.
• Visible larvae or maggots in stool.
• Sensation of movement in the abdomen.
• Unexplained weight loss or malnutrition.

Diagnosis

Diagnosis is primarily clinical, based on patient history (e.g., exposure to contaminated food/water) and symptom presentation. Confirmation may involve stool examination to identify larvae or maggots. Imaging studies (e.g., endoscopy) may be used to assess intestinal involvement or rule out other conditions.

Treatment Options

Treatment focuses on removing larvae and managing symptoms. This may include anthelmintic medications (e.g., ivermectin) to eliminate larvae, supportive care for gastrointestinal symptoms (e.g., antiemetics, hydration), and addressing underlying risk factors (e.g., improving sanitation). In severe cases, endoscopic removal of larvae may be necessary.

Prognosis and Follow-Up

Prognosis is generally favorable with prompt treatment, especially in otherwise healthy individuals. Follow-up may involve monitoring for symptom resolution and addressing any underlying conditions that contributed to the infestation. Recurrence is possible if exposure to contaminated sources continues.

Complications

• Intestinal obstruction or perforation.
• Secondary bacterial infections.
• Malnutrition or dehydration from prolonged gastrointestinal symptoms.
• Allergic reactions to larval proteins.

Lifestyle & Prevention

• Practice good food hygiene (e.g., cook food thoroughly, wash produce).
• Avoid consuming raw or undercooked meat, fish, or vegetables.
• Maintain clean water sources and proper sanitation.
• Use protective measures (e.g., screens, repellents) in high-risk environments.
• Seek prompt medical care for persistent gastrointestinal symptoms.

When to Seek Professional Help

Consult a healthcare provider if you experience persistent abdominal pain, unexplained weight loss, or visible larvae in stool. Seek immediate care for severe symptoms (e.g., vomiting, dehydration) or signs of intestinal obstruction.

Tips for Medical Coders

Document the clinical confirmation of intestinal myiasis, including symptom details, diagnostic methods (e.g., stool analysis, endoscopy), and treatment provided. Ensure the code B87.82 is used when the infestation is specifically localized to the intestinal tract, with clear differentiation from other myiasis sites (e.g., genitourinary, cutaneous).