ICD-10 Code B70.0 – Diphyllobothriasis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B70.0 – Diphyllobothriasis
What it is
Diphyllobothriasis is an intestinal infection caused by a fish tapeworm. Use this code when documentation identifies Diphyllobothrium infection or diphyllobothriasis.
Clinical signs
Clinical features vary; refer to documentation. Patients may have abdominal discomfort, nausea, diarrhea, or evidence of tapeworm segments in stool.
When to use this code
Use B70.0 when the provider documents diphyllobothriasis, fish tapeworm infection, or a confirmed Diphyllobothrium infestation. It may also apply when the record clearly links symptoms or stool findings to this diagnosis. Check documentation if the species is not specified.
Do not use for
Do not use this code for nonspecific intestinal parasites without confirmation of diphyllobothriasis. If the record only says “tapeworm” or another helminth, code the documented organism instead.
Coding tip
Code the condition only when the chart supports a specific Diphyllobothrium diagnosis, and query if the organism is unclear.