2027 ICD-10-CM Diagnosis Code B79Trichuriasis

ICD-10-CM Codes›A00–B99›B65-B83›B79

ICD-10-CM B79
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

B79 is a billable ICD-10-CM diagnosis code for trichuriasis. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 391 through 392. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 16 closely related codes. 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
Short Description
Trichuriasis
Same as the full description in the CMS dataset.
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

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to B79: 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.

On B79 itself
  • trichocephaliasis
  • whipworm (disease)(infection)
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 B79, its category, or a range that includes it.

Applicable To 1

These notes mention B79.

  • 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 B79 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

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

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.

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

Questions About B79Overview

What is the ICD-10 code for trichuriasis?

The ICD-10-CM code for trichuriasis is B79. It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

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, 2026 through September 30, 2027.

What MS-DRG does B79 group to?

When trichuriasis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 392, 391, with relative weights from 0.7645 to 1.2389 depending on complications. Higher weights mean higher Medicare reimbursement.

Is B79 a CC or MCC?

CMS lists B79 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 16 closely related codes in its exclusion list.

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.