ICD-10 Code A21.3 – Gastrointestinal Tularemia (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A21.3 – Gastrointestinal tularemia
What it is
Gastrointestinal tularemia is a form of infection caused by Francisella tularensis that affects the digestive tract. It usually follows ingestion of contaminated food or water and may involve the stomach, intestines, or lymph nodes.
Clinical signs
Clinical features vary; refer to documentation. Typical findings can include abdominal pain, diarrhea, vomiting, fever, and sometimes localized lymph node swelling after exposure.
When to use this code
Use A21.3 when the provider documents tularemia with gastrointestinal involvement, such as enteric infection after confirmed or suspected exposure. Code it when the record specifically identifies the GI form, not just nonspecific fever or abdominal symptoms.
If the note only says tularemia without site detail, check documentation before assigning this code. Confirm that the gastrointestinal manifestation is clearly stated in the assessment or final diagnosis.
Do not use for
Do not use this code for other intestinal infections, food poisoning, or unspecified tularemia without gastrointestinal involvement. Check documentation if the site of infection is unclear.
Coding tip
Verify that the provider links the gastrointestinal symptoms to tularemia before coding A21.3.