ICD-10 Code K52.2 – Allergic and dietetic gastroenteritis and colitis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K52.2 – Allergic and dietetic gastroenteritis and colitis
What it is
K52.2 identifies allergic or diet-related inflammation of the stomach and intestines. Use it when documentation links gastroenteritis or colitis to a food allergy, intolerance, or other dietary trigger.
Clinical signs
Clinical features vary; refer to documentation. Commonly recorded findings include abdominal pain, diarrhea, nausea, vomiting, or colitis symptoms after exposure to a suspected food or diet trigger.
When to use this code
Use K52.2 when the provider documents allergic gastroenteritis, dietetic colitis, or a similar inflammatory GI reaction caused by food or diet. It is appropriate when the diagnosis is confirmed or clearly stated in the chart.
Code it for encounters focused on the allergic or dietary cause of the gastrointestinal inflammation. If the record only mentions nonspecific abdominal symptoms without a cause, check documentation before assigning this code.
Do not use for
Do not use K52.2 for infectious gastroenteritis, irritable bowel syndrome, or nonspecific diarrhea without an allergic or dietetic cause. Check documentation if the provider uses a different GI diagnosis.
Coding tip
Assign K52.2 only when the chart clearly ties the colitis or gastroenteritis to an allergy or dietary trigger.