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ICD10BillableValid for clinical use

ICD-10 Code B66.3: Fascioliasis

B66.3 is a billable ICD-10 diagnosis code used to classify Fascioliasis in medical records and claims. You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records. ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Certain infectious and parasitic diseases (A00-B99).

What is this code?

ICD-10 codes are diagnosis classification codes used in healthcare records, reporting, coding workflows, and billing support. This code sits within the broader ICD-10 area for Certain infectious and parasitic diseases (A00-B99).

When is it used?

  • May be used when a clinician documents fascioliasis in a patient's medical record.
  • May appear in hospital records, claims, referrals, and clinical documentation.
  • This code can be used as a clinically usable diagnosis entry in standardized coding workflows.

What it does not mean

  • A code alone does not explain severity, treatment plan, or outcome.
  • A medical code should not be treated as a substitute for a doctor's diagnosis or advice.

Code hierarchy

chapter
1Certain infectious and parasitic diseases (A00-B99)
block
B65-B83Helminthiases
category
B66Other fluke infections
currentB66

Official coding notes

Inclusion terms
  • Infection due to Fasciola gigantica
  • Infection due to Fasciola hepatica
  • Infection due to Fasciola indica
  • Sheep liver fluke disease

Where you may see this code

You may see this code in hospital records, discharge summaries, insurance claims, encounter documentation, referrals, or other healthcare billing and coding records.

Related specialists

Infectious Disease SpecialistGeneral Physician

Coverage-related procedures and services

Coding guidelines

Compatibility

Legacy and official ICD code match exactly.
Legacy codes
B66.3

Common synonyms

Fascioliasis

Frequently asked questions

Code details

CodeB66.3
SystemICD10
Display nameFascioliasis
ChapterCertain infectious and parasitic diseases (A00-B99)
BlockHelminthiases

Flags

BillableYes
Valid clinical useYes

Source

SourceICD-10
Version2026-annual
Releaseannual
Year2026

Index terms

Matched terms
Cirrhosis, cirrhotic(hepatic) (liver)Disease, diseasedDistoma hepaticum infestationDistomiasisDistomiasisDistomiasisFascioliasisFlukes NECInfection, infected, infective(opportunistic)Infection, infected, infective(opportunistic)InfestationInfestation

About this content

This page is prepared by HealthAssure's clinical team using official coding standards from ICD-10. AI tools assist with drafting explanations, which are then reviewed and verified by healthcare professionals for accuracy. This content is for informational purposes and does not replace professional medical advice. Meet our team.