2026 ICD-10-CM Diagnosis Code B79Trichuriasis

ICD-10-CM Codes›A00–B99›B65-B83›B79

ICD-10-CM B79
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

B79 is a billable ICD-10-CM diagnosis code for trichuriasis. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 391 through 392. Coders also document this condition as infection by Trichuris globulosa. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Parasitic, other specified and unspecified infections.

Code Identity

ICD-10-CM Code
B79
Billable Status
Yes — Valid for Submission
Code Describes
Trichuriasis
Chapter
B65-B83
Helminthiases

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionB65-B83Helminthiases
CategoryB79Trichuriasis
This CodeB79Trichuriasis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Infection by Trichuris globulosa
  • Infection by Trichuris ovis
  • Infection by Trichuris suis
  • Infection by Trichuris trichiura
  • Infection by Trichuris vulpis
  • Trichuriasis

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Includes

  • trichocephaliasis
  • whipworm (disease)(infection)

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Diarrhea, diarrheal(disease) (infantile) (inflammatory)
      • due to
        • Trichuris trichiuria
    • Disease, diseased
      • whipworm
    • Infection, infected, infective(opportunistic)
      • Trichuris (trichiura)
    • Infection, infected, infective(opportunistic)
      • whipworm
    • Infestation
      • helminth
        • intestinal
          • trichuriasis
    • Infestation
      • nematode NEC (intestinal)
        • trichuris (trichuria)
    • Infestation
      • Trichocephalus
    • Infestation
      • Trichuris (trichiura)
    • Infestation
      • whipworm
    • Prolapse, prolapsed
      • rectum (mucosa) (sphincter)
        • due to trichuris trichuria
    • Trichocephaliasis, trichocephalosis
    • Trichocephalus infestation
    • Trichuriasis
    • Trichuris trichiura(infection) (infestation) (any site)
    • Whipworm(disease) (infection) (infestation)

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR INF009
Parasitic, other specified and unspecified infections
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Trichuriasis

    infection with nematodes of the genus trichuris, formerly called trichocephalus.

  • Trichuris

    a genus of nematode worms comprising the whipworms.

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.

Convert B79 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
127.3 Trichuriasis
Exact Match The mapping is direct, with no qualifiers.

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 B79Overview

Is B79 (Trichuriasis) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report trichuriasis on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does B79 group to?

When trichuriasis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 391, 392, with relative weights from 0.7796 to 1.2683 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of B79?

Under the General Equivalence Mappings, trichuriasis converts to ICD-9-CM 127.3 (trichuriasis). The mapping is a direct match.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.