2026 ICD-10-CM Diagnosis Code B76.1Necatoriasis

ICD-10-CM Codes›A00–B99›B65-B83›B76

ICD-10-CM B76.1
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

B76.1 is a billable ICD-10-CM diagnosis code for necatoriasis. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 371 through 373. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Parasitic, other specified and unspecified infections.

Code Identity

ICD-10-CM Code
B76.1
Billable Status
Yes — Valid for Submission
Code Describes
Necatoriasis
Short Description
Necatoriasis
Same as the full description in the CMS dataset.
Parent Code
B76
Hookworm diseases

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionB65-B83Helminthiases
CategoryB76Hookworm diseases
This CodeB76.1Necatoriasis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Necatoriasis
  • Necatoriasis caused by Necator americanus

Tabular List NotesGuidance

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

Inclusion Terms

  • Infection due to Necator americanus

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.

    • Ancylostoma, ancylostomiasis(braziliense) (caninum) (ceylanicum) (duodenale)
      • Necator americanus
    • Anemia(essential) (general) (hemoglobin deficiency) (infantile) (primary) (profound)
      • due to (in) (with)
        • Necator americanus
    • Diarrhea, diarrheal(disease) (infantile) (inflammatory)
      • due to
        • Necator americanus
    • Helminthiasis
      • Necator (americanus)
    • Infection, infected, infective(opportunistic)
      • Necator americanus
    • Infestation
      • Ancylostoma, ankylostoma (braziliense) (caninum) (ceylanicum) (duodenale)
        • americanum
    • Infestation
      • Ancylostoma, ankylostoma (braziliense) (caninum) (ceylanicum) (duodenale)
        • new world
    • Infestation
      • hookworm
        • necatoriasis
    • Infestation
      • Necator americanus
    • Infestation
      • Uncinaria americana
    • Necator americanus infestation
    • Necatoriasis
    • Uncinaria americana 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

  • Necatoriasis

    infection of humans or animals with hookworms of the genus necator. the resulting anemia from this condition is less severe than that from ancylostomiasis.

  • Necatoriasis

    a disorder caused by an infection with hookworms of the genus necator, which settle in the host's small intestine, and cause abdominal pain, diarrhea, weight loss, and anemia.

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 B76.1 to ICD-9-CMHistory

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

ICD-9-CM
126.1 Necator Americanus
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 B76.1Overview

Is B76.1 (Hookworm diseases) a billable code?

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

What MS-DRG does B76.1 group to?

When necatoriasis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 371, 372, 373, with relative weights from 0.7274 to 1.7731 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of B76.1?

Under the General Equivalence Mappings, necatoriasis converts to ICD-9-CM 126.1 (necator Americanus). 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.