ICD-10 Code B81.3 – Intestinal angiostrongyliasis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B81.3 – Intestinal angiostrongyliasis
What it is
B81.3 identifies intestinal angiostrongyliasis, a parasitic infection of the intestine caused by Angiostrongylus species. Use it when documentation specifically names this diagnosis.
Clinical signs
Clinical features vary; refer to documentation. Reported findings may include abdominal pain, diarrhea, nausea, or other gastrointestinal complaints, but coding should follow the confirmed clinical diagnosis.
When to use this code
Use B81.3 when the provider documents intestinal angiostrongyliasis, or when the record clearly confirms this parasitic intestinal infection. It may also apply when the diagnosis is established after evaluation of compatible gastrointestinal illness and parasite identification. Check documentation if the note only says “intestinal parasite” or gives an unspecified helminth infection.
Do not use for
Do not use this code for nonspecific abdominal symptoms, gastroenteritis, or other parasitic infections without documentation of intestinal angiostrongyliasis. If the organism or site is different, code the documented condition instead.
Coding tip
Code only when the provider names intestinal angiostrongyliasis or clearly documents the parasite causing it; otherwise, check documentation for a more specific diagnosis.