ICD-10 Code K29.9 – Gastroduodenitis, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K29.9 – Gastroduodenitis, unspecified
What it is
K29.9 identifies inflammation involving both the stomach and duodenum when the record does not specify an acute, chronic, or other named form. Use it when documentation simply states gastroduodenitis.
Clinical signs
Clinical features vary; refer to documentation. Typical records may note upper abdominal pain, dyspepsia, nausea, vomiting, or endoscopic evidence of inflammation affecting the stomach and duodenum.
When to use this code
Use K29.9 when the provider documents gastroduodenitis without further detail and no more specific ICD-10-CM option is supported. It also fits cases where the chart confirms combined gastric and duodenal inflammation but does not name the cause or type. Check documentation if gastritis or duodenitis is listed separately.
Do not use for
Do not use this code for isolated gastritis or isolated duodenitis, because those conditions have different codes. Avoid K29.9 when the record specifies a more exact diagnosis, such as acute or chronic gastroduodenitis.
Coding tip
Query the provider when the note is vague, because specificity may change the code selection.