B66.0

ICD-10Billable

Opisthorchiasis

Official ICD-10-CM descriptor (FY2026)

Opisthorchiasis

B66.0 is valid for submission on a claim — CMS flags it as a billable, specific code.

Inclusion terms

Infection due to cat liver fluke
Infection due to Opisthorchis (felineus)(viverrini)

Related codes in B66

B66.1Clonorchiasis
B66.2Dicroceliasis
B66.3Fascioliasis
B66.4Paragonimiasis
B66.5Fasciolopsiasis
B66.8Other specified fluke infections
B66.9Fluke infection, unspecified

Where this code sits

Chapter: 1. Certain infectious and parasitic diseases (A00-B99)
Block: Helminthiases (B65-B83)
Parent code: B66

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Source

ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.