Eosinophilic gastritis or gastroenteritis

This code signifies an inflammatory condition of the stomach and/or small intestine characterized by an abnormal accumulation of eosinophils. It represents a specific type of gastrointestinal inflammation distinct from other forms of gastritis or gastroenteritis.

Apply this code when documentation explicitly states a diagnosis of eosinophilic gastritis or eosinophilic gastroenteritis. This diagnosis is typically confirmed by endoscopic biopsy showing significant eosinophilic infiltration of the gastric or intestinal mucosa.

• Ensure the documentation clearly specifies "gastritis" or "gastroenteritis" and not solely "colitis" or "esophagitis."
• Do not use this code for eosinophilic esophagitis (K20.0), which is an Excludes2 condition.
• Look for pathology reports confirming eosinophilic infiltration to support this diagnosis.