B77 Ascariasis

Name of the Condition

• Ascariasis

Summary

Ascariasis is a parasitic infection caused by the roundworm Ascaris lumbricoides. It is one of the most common helminthic infections globally, particularly in areas with poor sanitation. The infection typically occurs when individuals ingest eggs from contaminated soil, leading to larval migration through the lungs and intestines. Most cases are asymptomatic or mild, but heavy infestations can cause significant gastrointestinal or respiratory symptoms.

Causes

Ascariasis is caused by the ingestion of Ascaris lumbricoides eggs, which are shed in human feces and can contaminate soil, food, or water. The eggs hatch in the intestine, releasing larvae that migrate through the bloodstream to the lungs, where they are coughed up and swallowed, maturing into adult worms in the small intestine. Adult worms can live for 1–2 years and produce thousands of eggs daily, perpetuating the cycle of infection.

Risk Factors

• Living in or traveling to areas with poor sanitation and hygiene.
• Ingesting food or water contaminated with fecal matter.
• Lack of access to clean water or proper waste disposal.
• Occupational exposure, such as working in agriculture or handling soil.
• Children, who are more likely to engage in behaviors like eating dirt or not washing hands.

Symptoms

• Mild or no symptoms in many cases.
• Cough, wheezing, or shortness of breath during the larval migration phase.
• Abdominal pain, bloating, or nausea from adult worms in the intestine.
• Visible worms in stool or vomit (in heavy infestations).
• Malnutrition or growth delays in children with chronic infections.

Diagnosis

Diagnosis is typically confirmed by identifying Ascaris eggs in a stool sample using microscopy. In cases of larval migration, chest X-rays may show transient infiltrates. Serological tests or imaging (e.g., ultrasound) may be used to detect adult worms or complications, such as intestinal obstruction. Clinical history and exposure risks also support the diagnosis.

Treatment Options

• Anthelmintic medications, such as albendazole or mebendazole, are first-line treatments to eliminate adult worms.
• Supportive care, including hydration and electrolyte management, for symptoms like vomiting or diarrhea.
• In severe cases (e.g., intestinal obstruction), surgical intervention may be necessary.
• Reinfection prevention through improved sanitation and hygiene practices.

Prognosis and Follow-Up

Prognosis is generally good with appropriate treatment, especially in uncomplicated cases. Most individuals recover fully without long-term effects. Follow-up may include repeat stool testing to confirm eradication of the parasite, particularly in endemic areas or for high-risk groups. Chronic infestations in children may require monitoring for nutritional deficiencies.

Complications

• Intestinal obstruction or perforation from large worm masses.
• Biliary tract obstruction or pancreatitis if worms migrate to the bile ducts.
• Nutritional deficiencies, including protein-energy malnutrition and vitamin A deficiency.
• Respiratory complications, such as pneumonia, during larval migration.

Lifestyle & Prevention

• Practice good hand hygiene, especially before eating or after using the toilet.
• Ensure access to clean water and proper sanitation facilities.
• Cook food thoroughly and wash fruits/vegetables to avoid contamination.
• Avoid ingesting soil or using human feces as fertilizer.
• Promote community-wide sanitation improvements in endemic areas.

When to Seek Professional Help

Seek medical attention if you experience severe abdominal pain, vomiting, or signs of intestinal obstruction. Consult a healthcare provider if respiratory symptoms (e.g., persistent cough, wheezing) occur after potential exposure. Children with growth delays or malnutrition should be evaluated promptly.

Tips for Medical Coders

• Use code B77 for ascariasis, ensuring documentation supports the diagnosis (e.g., stool sample results, clinical symptoms).
• Differentiate ascariasis from other parasitic infections (e.g., hookworm, trichuriasis) based on clinical presentation and diagnostic findings.
• Document any complications (e.g., intestinal obstruction) separately if applicable, as they may require additional coding.
• Note the setting (e.g., inpatient vs. outpatient) and any relevant exposure history to support code assignment.