2027 ICD-10-CM Diagnosis Code B66Other fluke infections

ICD-10-CM Codes›A00–B99›B65-B83›B66

ICD-10-CM B66
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

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
Short Description
Other fluke infections
Same as the full description in the CMS dataset.
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

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to B66: its own notes plus those printed at Chapter 1. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • diseases generally recognized as communicable or transmissible

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • carrier or suspected carrier of infectious disease (Z22.-)
  • certain localized infections - see body system-related chapters
  • infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
  • infectious and parasitic diseases specific to the perinatal period (P35-P39)
  • influenza and other acute respiratory infections (J00-J22)

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • code to identify resistance to antimicrobial drugs (Z16.-)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name B66, its category, or a range that includes it.

Applicable To 1

These notes mention B66.

  • B81.4 Mixed intestinal helminthiases
    Infection due to intestinal helminths classified to more than one of the categories B65.0-B81.3 and B81.8 names B65.0-B81.3, which includes this code

Code First 1

These codes say to code first a condition named in the note, and B66 is one of the conditions named.

  • K67 Disorders of peritoneum in infectious diseases classified elsewhere
    helminthiasis (B65.0 -B83.9) names B65.0 -B83.9, which includes this code

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 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About B66Overview

What is the ICD-10 code for other fluke infections?

B66 is the ICD-10-CM category for other fluke infections, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

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.