ICD-10 Code K52.81 – Eosinophilic gastritis or gastroenteritis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K52.81 – Eosinophilic gastritis or gastroenteritis
What it is
K52.81 identifies eosinophilic inflammation of the stomach or intestines. Use it when the record documents eosinophilic gastritis, gastroenteritis, or both.
Clinical signs
Clinical features vary; refer to documentation. Commonly noted findings include abdominal pain, nausea, vomiting, diarrhea, and evidence of eosinophilic infiltration on biopsy or other diagnostic evaluation.
When to use this code
Use K52.81 when the provider confirms eosinophilic gastritis or eosinophilic gastroenteritis as the diagnosis. It may also apply when the condition is documented as a primary cause of gastrointestinal symptoms and supported by pathology or specialist assessment.
Code it only when the chart clearly identifies this eosinophilic disorder. If the note mentions eosinophilia without a GI diagnosis, check documentation before assigning the code.
Do not use for
Do not use this code for nonspecific gastroenteritis, infectious enteritis, or abdominal symptoms without a documented eosinophilic GI diagnosis. Check documentation if the record is unclear.
Coding tip
Look for explicit language such as “eosinophilic gastritis” or “eosinophilic gastroenteritis” in the assessment, pathology, or discharge summary before coding K52.81.