B71.0 Hymenolepiasis

Name of the Condition

• Hymenolepiasis

Summary

Hymenolepiasis is a parasitic infection caused by tapeworms of the genus Hymenolepis, most commonly Hymenolepis nana (dwarf tapeworm) or Hymenolepis diminuta. The infection typically affects the small intestine and may range from asymptomatic to symptomatic, with mild to moderate gastrointestinal manifestations. It is more prevalent in areas with poor sanitation and hygiene.

Causes

The infection is caused by ingesting tapeworm eggs or larvae from contaminated sources. Hymenolepis nana can complete its life cycle within a single host, while Hymenolepis diminuta requires an intermediate host (e.g., insects) for transmission. Ingestion of contaminated food, water, or surfaces contaminated with fecal matter containing eggs is the primary route of infection.

Risk Factors

• Exposure to environments with poor sanitation or hygiene.
• Close contact with infected individuals, particularly in crowded settings.
• Ingestion of undercooked or contaminated food, such as grains infested with insects.
• Weakened immune systems, which may increase susceptibility to infection.

Symptoms

• Abdominal pain or discomfort.
• Nausea, vomiting, or diarrhea.
• Loss of appetite or unexplained weight loss.
• Irritability or restlessness (especially in children).
• Visible tapeworm segments in stool (rare).

Diagnosis

Diagnosis is typically confirmed by identifying tapeworm eggs or larvae in stool samples through microscopic examination. Serological tests may be used in some cases, but stool analysis remains the primary method. A detailed patient history, including potential exposure to contaminated sources, supports clinical suspicion.

Treatment Options

Treatment usually involves oral antiparasitic medications, such as praziquantel or niclosamide, to eliminate the infection. Dosage and duration depend on the species and severity of infection. Hygiene measures, including handwashing and environmental sanitation, are recommended to prevent reinfection.

Prognosis and Follow-Up

With appropriate treatment, the prognosis is generally good, and most infections resolve without complications. Follow-up stool examinations may be performed to confirm eradication of the parasite, especially in cases of recurrent or severe infection. Reinfection is possible if exposure to contaminated sources continues.

Complications

• Malnutrition or vitamin deficiencies due to prolonged infection.
• Intestinal obstruction (rare, more common with heavy infestations).
• Neurological symptoms (rare, associated with Hymenolepis nana in severe cases).

Lifestyle & Prevention

• Practice good hand hygiene, especially after using the restroom or handling food.
• Ensure food, particularly grains and cereals, is stored in sealed containers to prevent insect contamination.
• Avoid consuming undercooked or raw foods from unreliable sources.
• Maintain clean living environments, especially in areas with known transmission risks.

When to Seek Professional Help

Seek medical attention if symptoms persist or worsen, or if you suspect exposure to contaminated sources. Prompt evaluation is recommended for individuals with weakened immune systems, as they may be at higher risk for complications.

Tips for Medical Coders

When coding for hymenolepiasis, use ICD-10-CM code B71.0. Ensure documentation supports the diagnosis, including clinical findings (e.g., stool sample results) and exposure history. Code assignment should reflect the specific species if identified, as Hymenolepis nana and Hymenolepis diminuta are both classified under this code.