ICD-10 Code K31.89 – Other diseases of stomach and duodenum (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K31.89 – Other diseases of stomach and duodenum
What it is
K31.89 is a diagnosis code for disorders of the stomach or duodenum that do not fit a more specific ICD-10-CM category. Use it when the record identifies a non-specific or miscellaneous stomach or duodenal condition.
Clinical signs
Clinical features vary; refer to documentation. Patients may have upper abdominal discomfort, indigestion, nausea, or other nonspecific gastrointestinal complaints, but the exact condition must be supported by the chart.
When to use this code
Use K31.89 when the provider documents a stomach or duodenal disorder that is not otherwise classified and no more specific code is available. It may fit “other” or “unspecified” conditions affecting these organs. Check the note carefully for a more precise diagnosis before assigning this code.
Do not use for
Do not use K31.89 if the record supports a specific diagnosis such as gastritis, ulcer disease, obstruction, or functional dyspepsia. Also avoid it when documentation is too vague; check documentation.
Coding tip
Code K31.89 only after ruling out a more specific stomach or duodenal code from the documentation.