B66.5 Fasciolopsiasis

The ICD-10-CM code for Fasciolopsiasis is B66.5 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

1: Certain infectious and parasitic diseases (A00-B99)

Section

B65-B83: Helminthiases (B65-B83)

Category B66

9 codes (8 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to B66.5:

• Fasciolopsis, fasciolopsiasis (intestinal)
• Infection, infected, infective (opportunistic) › Fasciolopsis (buski)
• Infestation › Fasciolopsis (buski) (intestine)
• Distomiasis › intestinal
• Infestation › fluke › intestinal

Inclusion Terms

• Infection due to Fasciolopsis buski
• Intestinal distomiasis

Official Coding Guidelines

HIV Infections (TOC entry)

a. Human Immunodeficiency Virus (HIV) Infections .............................................................. 19

Infectious agents causing diseases in other chapters (TOC)

b. Infectious agents as the cause of diseases classified to other chapters ................................. 22

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool