2026 ICD-10-CM Diagnosis Code B66Other fluke infections

ICD-10-CM Codes›A00–B99›B65-B83›B66

ICD-10-CM B66
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

B66 is a non-billable ICD-10-CM category code for other fluke infections, so it cannot be submitted on claims. Use a more specific code from this category instead, such as B66.0, B66.1, B66.2, and B66.3.

Code Identity

ICD-10-CM Code
B66
Billable Status
No — Non-Billable Category
Code Describes
Other fluke infections
Chapter
B65-B83
Helminthiases

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionB65-B83Helminthiases
CategoryB66Other fluke infections
This CodeB66Other fluke infections

Specific Coding for Other fluke infectionsOverview

Non-specific codes like B66 require more characters. Use one of these billable codes instead:

  • Use B66.0 for Opisthorchiasis

  • Use B66.1 for Clonorchiasis

  • Use B66.2 for Dicroceliasis

  • Use B66.3 for Fascioliasis

  • Use B66.4 for Paragonimiasis

  • Use B66.5 for Fasciolopsiasis

  • Use B66.8 for Other specified fluke infections

  • Use B66.9 for Fluke infection, unspecified

Patient EducationClinical

Parasitic Diseases

Parasites are living things that use other living things - like your body - for food and a place to live. You can get them from contaminated food or water, a bug bite, or sexual contact. Some parasitic diseases are easily treated and some are not.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About B66Overview

Is B66 (Other fluke infections) a billable code?

No. This is a category header that groups the codes for other fluke infections, and headers cannot be submitted on claims. Claims for other fluke infections need a more specific code from this category, such as B66.0, B66.1, and B66.2.