Other fluke infections (B66) ICD-10-CM
The B66 code range covers other fluke infections with 9 ICD-10-CM diagnosis codes. 8 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Codes in the B66 Range 9 codes · 8 billable
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the B66 range.
Clonorchiasis
Infection of the biliary passages with CLONORCHIS SINENSIS, also called Opisthorchis sinensis. It may lead to inflammation of the biliary tract, proliferation of biliary epithelium, progressive portal fibrosis, and sometimes bile duct carcinoma. Extension to the liver may lead to fatty changes and cirrhosis. (From Dorland, 27th ed)
Echinostomiasis
Infection by flukes of the genus Echinostoma.
Fascioliasis
Liver disease caused by infections with parasitic flukes of the genus FASCIOLA, such as FASCIOLA HEPATICA.
Fasciolopsiasis
A small bowel infection that is caused by Fasciolopsis buski, which is endemic in the Far East and Southeast Asia, and which is transmitted via the consumption of raw or undercooked aquatic plants. The spectrum of manifestations range from asymptomatic to intestinal symptoms from local invasion or allergic response.
Opisthorchiasis
Infection with flukes of the genus Opisthorchis.
Paragonimiasis
Infection with TREMATODA of the genus PARAGONIMUS.
About the B66 Code Range
Fluke infections belong to the broader group of parasitic worm diseases called helminthiases.
B66 separates them by named infection: opisthorchiasis, clonorchiasis, dicroceliasis, fascioliasis, paragonimiasis, and fasciolopsiasis. The subdivisions also distinguish other specified fluke infections, B66.8, from fluke infections that are unspecified, B66.9.
Questions About This Page
How many billable codes are in the B66 range?
Of the 9 codes in this range, 8 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the B66 range classify?
The range classifies other fluke infections. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
