A04.6 Enteritis due to Yersinia enterocolitica

Name of the Condition

• Enteritis due to Yersinia enterocolitica

Summary

Enteritis due to Yersinia enterocolitica is an intestinal infection caused by the bacterium Yersinia enterocolitica. It primarily affects the small intestine and can lead to gastrointestinal symptoms, including diarrhea and abdominal pain. The infection is often associated with contaminated food, particularly undercooked pork or unpasteurized dairy products, and may occur in outbreaks or sporadic cases.

Causes

This condition is caused by the ingestion of food or water contaminated with Yersinia enterocolitica bacteria. The bacteria can survive in refrigerated conditions, making undercooked or improperly stored foods a common source of infection. Person-to-person transmission is less common but possible, especially in settings with poor hygiene.

Risk Factors

• Consumption of undercooked pork or contaminated dairy products.
• Poor food handling and storage practices.
• Exposure to contaminated water or environments.
• Weakened immune system, including conditions like iron overload or chronic illness.
• Age, with higher incidence in children and young adults.

Symptoms

• Diarrhea (often watery, may become bloody).
• Abdominal pain and cramping, sometimes mimicking appendicitis.
• Fever and chills.
• Nausea and vomiting.
• Loss of appetite and weight loss.
• Joint pain or swelling (in some cases).

Diagnosis

Diagnosis involves stool sample analysis to detect Yersinia enterocolitica bacteria. Clinical evaluation of symptoms, exposure history, and physical examination may guide testing. Laboratory methods such as culture or molecular testing can confirm the presence of the bacteria. Imaging or blood tests may be used to rule out complications like appendicitis.

Treatment Options

• Rehydration therapy to address fluid and electrolyte loss.
• Antibiotics may be prescribed for severe or prolonged cases.
• Pain management and supportive care for symptoms.
• Avoidance of unnecessary antibiotics in mild cases to prevent resistance.

Prognosis and Follow-Up

Most cases resolve within 1–3 weeks with proper hydration and rest. Follow-up may be recommended for severe infections or those with complications. Recurrence is rare, but monitoring for persistent symptoms or secondary issues like reactive arthritis is important.

Complications

• Appendicitis-like symptoms requiring surgical evaluation.
• Reactive arthritis, particularly in adults.
• Septicemia in immunocompromised individuals.
• Gastrointestinal bleeding or perforation in severe cases.

Lifestyle & Prevention

• Cook pork and other meats thoroughly.
• Avoid unpasteurized dairy products.
• Practice good hand hygiene, especially after handling raw meat.
• Ensure proper food storage and avoid cross-contamination.
• Stay informed about food recalls or outbreaks.

When to Seek Professional Help

Seek medical attention if symptoms worsen, persist beyond a week, or include high fever, severe abdominal pain, bloody diarrhea, or signs of dehydration. Immunocompromised individuals should consult a healthcare provider promptly.

Tips for Medical Coders

Document the clinical diagnosis of enteritis due to Yersinia enterocolitica clearly, including symptoms, exposure history, and laboratory confirmation when available. Ensure the code A04.6 is used for confirmed cases, with supporting documentation to justify the specificity of the bacterial cause.