A06.2 Amebic nondysenteric colitis

Name of the Condition

• Amebic nondysenteric colitis (ICD-10-CM Code: A06.2)

Summary

Amebic nondysenteric colitis is a form of intestinal infection caused by the protozoan parasite Entamoeba histolytica. It involves inflammation of the colon without the severe dysenteric symptoms (e.g., profuse bloody diarrhea) seen in acute amebic dysentery. The condition may present with mild to moderate gastrointestinal symptoms and can range from asymptomatic to chronic.

Causes

Amebic nondysenteric colitis is caused by the parasite Entamoeba histolytica. Transmission occurs through ingestion of cysts, typically via contaminated food or water. The parasite invades the intestinal mucosa, leading to localized inflammation, but the severity is less pronounced than in dysenteric forms.

Risk Factors

• Living in or traveling to regions with poor sanitation.
• Consuming contaminated food or water.
• Weakened immune system, which may increase susceptibility to infection.
• Close contact with an infected individual or exposure to fecal matter.

Symptoms

• Mild to moderate abdominal pain or cramping.
• Non-bloody diarrhea, sometimes with mucus.
• Fatigue and mild weight loss.
• Occasional low-grade fever.

Diagnosis

Diagnosis involves stool examination to detect E. histolytica cysts or trophozoites. Serological tests may identify antibodies, and colonoscopy with biopsy can confirm intestinal involvement. Imaging studies (e.g., ultrasound, CT) are used if complications like liver abscesses are suspected.

Treatment Options

• Antiparasitic medications (e.g., metronidazole, tinidazole) to eliminate trophozoites.
• Follow-up treatment with luminal agents (e.g., paromomycin) to eradicate cysts.
• Supportive care, including hydration and electrolyte management.

Prognosis and Follow-Up

With appropriate treatment, most patients recover fully. Chronic or recurrent infection may occur if treatment is incomplete. Follow-up stool tests and clinical evaluation are recommended to ensure resolution and prevent relapse.

Complications

• Chronic colitis with persistent symptoms.
• Rare progression to dysenteric colitis or extraintestinal spread (e.g., liver abscess).
• Malabsorption or nutritional deficiencies in prolonged cases.

Lifestyle & Prevention

• Avoid consuming untreated water or food in endemic areas.
• Practice good hand hygiene, especially after handling soil or fecal matter.
• Ensure proper sanitation in living or travel environments.
• Cook food thoroughly and avoid raw or undercooked items in high-risk regions.

When to Seek Professional Help

Seek medical attention if symptoms persist or worsen, especially if diarrhea becomes severe, bloody, or accompanied by fever, dehydration, or abdominal tenderness. Prompt evaluation is necessary to rule out complications or alternative diagnoses.

Tips for Medical Coders

Document the presence of amebic colitis without dysentery, including clinical findings (e.g., stool test results, colonoscopy findings) and treatment. Ensure the code A06.2 is used when the condition is confirmed and does not meet criteria for more severe forms (e.g., dysentery). Include details on parasite identification and absence of dysenteric symptoms to support accurate coding.