2026 ICD-10-CM Diagnosis Code B74.3Loiasis

ICD-10-CM Codes›A00–B99›B65-B83›B74

ICD-10-CM B74.3
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

B74.3 is a billable ICD-10-CM diagnosis code for loiasis. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 867 through 869. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Parasitic, other specified and unspecified infections.

Code Identity

ICD-10-CM Code
B74.3
Billable Status
Yes — Valid for Submission
Code Describes
Loiasis
Short Description
Loiasis
Same as the full description in the CMS dataset.
Parent Code
B74
Filariasis

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionB65-B83Helminthiases
CategoryB74Filariasis
This CodeB74.3Loiasis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Calabar swelling
  • Cerebral loiasis
  • Cerebrospinal nematodiasis
  • Chylocele
  • Chylocele of tunica vaginalis caused by Loa loa
  • Infection by Loa loa
  • Infection caused by Loa
  • Infestation of eyelid caused by Loa loa
  • Loa loa lymphadenopathy

Tabular List NotesGuidance

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

Inclusion Terms

  • Calabar swelling
  • Eyeworm disease of Africa
  • Loa loa 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.

    • Calabar swelling
    • Disease, diseased
      • eyeworm of Africa
    • Eyeworm disease of Africa
    • Infection, infected, infective(opportunistic)
      • Loa loa
    • Infection, infected, infective(opportunistic)
      • Loa loa
        • with conjunctival infestation
    • Infection, infected, infective(opportunistic)
      • Loa loa
        • eyelid
    • Infestation
      • eyelid
        • in (due to)
          • loiasis
    • Infestation
      • eyeworm
    • Infestation
      • filarial
        • due to
          • loa loa
    • Infestation
      • Loa loa
    • Infestation
      • Loa loa
        • conjunctival
    • Infestation
      • Loa loa
        • eyelid
    • Loa loa(loiasis)
    • Loiasis(with conjunctival infestation) (eyelid)
    • Swelling(of)
      • Calabar

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

  • Loiasis

    a parasitic infection caused by the nematode loa loa. the vector in the transmission of this infection is the horsefly (tabanus) or the deerfly or mango fly (chrysops). the larvae may be seen just beneath the skin or passing through the conjunctiva. eye lesions are not uncommon. the disease is generally mild and painless.

  • Loiasis

    infection by the african eye worm, loa loa.

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 B74.3 to ICD-9-CMHistory

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

ICD-9-CM
125.2 Loiasis
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 B74.3Overview

Is B74.3 (Filariasis) a billable code?

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

What MS-DRG does B74.3 group to?

When loiasis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 867, 868, 869, with relative weights from 0.7297 to 2.0932 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of B74.3?

Under the General Equivalence Mappings, loiasis converts to ICD-9-CM 125.2 (loiasis). 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.