ICD-10 Code E74.31 – Sucrase-isomaltase deficiency (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code E74.31 – Sucrase-isomaltase deficiency
What it is
E74.31 identifies sucrase-isomaltase deficiency, a disorder where the intestine cannot properly break down sucrose and some starches. This leads to poor digestion after eating certain carbohydrates.
Clinical signs
Common features include bloating, abdominal pain, gas, and diarrhea after sucrose- or starch-containing foods. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents sucrase-isomaltase deficiency, congenital or acquired, as the cause of carbohydrate malabsorption. It may also apply when testing or specialist assessment confirms the diagnosis. Check documentation if the record only mentions nonspecific food intolerance or chronic diarrhea.
Do not use for
Do not use it for general lactose intolerance, celiac disease, or other malabsorption disorders unless sucrase-isomaltase deficiency is specifically documented. Do not assign it from symptoms alone.
Coding tip
Code E74.31 only when the diagnosis is clearly stated; if the chart is vague, query the provider.