Allergic gastroenteritis and colitis

This code represents an inflammatory condition of the stomach and intestines triggered by an allergic reaction to ingested substances. It involves an immune response within the gastrointestinal tract, leading to symptoms like abdominal pain, nausea, vomiting, diarrhea, and sometimes malabsorption.

Use this code when documentation clearly indicates a diagnosis of gastroenteritis or colitis specifically attributed to an allergic etiology. This typically involves a history of exposure to an allergen followed by GI symptoms, often confirmed by allergy testing or elimination diets. Documentation should specify the allergic nature of the inflammation.

• Ensure documentation explicitly states "allergic" gastroenteritis or colitis; do not assume allergy based solely on symptoms.
• Consider additional codes for specific allergic reactions (e.g., food allergy) if documented, but this code captures the GI manifestation.
• Differentiate from infectious gastroenteritis (e.g., viral, bacterial) or non-allergic inflammatory bowel conditions.