ICD-10 Code B81.0 – Anisakiasis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B81.0 – Anisakiasis
What it is
B81.0 identifies anisakiasis, a parasitic infection caused by eating fish or squid contaminated with Anisakis larvae. It usually affects the stomach or intestines after ingestion of raw or undercooked seafood.
Clinical signs
Common findings include sudden abdominal pain, nausea, vomiting, and sometimes diarrhea after seafood exposure. Clinical features vary; refer to documentation for confirmed gastrointestinal or allergic manifestations.
When to use this code
Use B81.0 when the provider documents anisakiasis or infection due to Anisakis species. It also fits confirmed cases linked to raw fish or squid exposure, including gastric or intestinal involvement. Check documentation if the record only notes suspected foodborne illness.
Do not use for
Do not use this code for nonspecific abdominal pain, routine food poisoning, or other helminth infections. If the chart does not identify Anisakis, check documentation.
Coding tip
Look for a documented seafood exposure and a confirmed Anisakis diagnosis before assigning B81.0.