ICD-10 Code B66.8 – Other specified fluke infections (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code B66.8 – Other specified fluke infections
What it is
B66.8 identifies infections caused by flukes, or trematodes, that are not classified elsewhere. Use it when documentation names a specific fluke infection that does not fit a more specific ICD-10-CM code.
Clinical signs
Clinical features vary; refer to documentation. Fluke infections may cause abdominal pain, fever, eosinophilia, hepatobiliary symptoms, or other organ-specific findings depending on the parasite and site involved.
When to use this code
Use B66.8 when the provider documents an “other specified” fluke infection and no more specific code is available. It also applies when the organism is identified as a fluke but the record does not support a more detailed category. Confirm the documentation before coding.
Do not use for
Do not use this code for fluke infections with a more specific ICD-10-CM code, or when the record only notes suspected exposure without confirmed infection. Check documentation if the parasite type is unclear.
Coding tip
Match the exact organism wording in the chart and code the most specific fluke infection available.