2026 ICD-10-CM Diagnosis Code B73.1Onchocerciasis without eye disease

ICD-10-CM Codes›A00–B99›B65-B83›B73

ICD-10-CM B73.1
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

B73.1 is a billable ICD-10-CM diagnosis code for onchocerciasis without eye disease. 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
B73.1
Billable Status
Yes — Valid for Submission
Code Describes
Onchocerciasis without eye disease
Short Description
Onchocerciasis without eye disease
Same as the full description in the CMS dataset.
Parent Code
B73
Onchocerciasis

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionB65-B83Helminthiases
CategoryB73Onchocerciasis
This CodeB73.1Onchocerciasis without eye disease

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acute papular onchodermatitis
  • Atrophic onchodermatitis
  • Chronic papular onchodermatitis
  • Infection by Onchocerca gibsoni
  • Infection by Onchocerca reticulata
  • Infection by Onchocerca volvulus
  • Infection caused by Onchocerca
  • Onchocercal lichenification
  • Onchocercal subcutaneous nodule
  • Onchodermatitis
  • Sowda

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.

    • Onchocerciasis, onchocercosis
    • Pruritus, pruritic(essential)
      • due to onchocerca volvulus

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

  • Onchocerciasis

    infection with nematodes of the genus onchocerca. characteristics include the presence of firm subcutaneous nodules filled with adult worms, pruritus, and ocular lesions.

  • Onchocerciasis, Ocular

    filarial infection of the eyes transmitted from person to person by bites of onchocerca volvulus-infected black flies. the microfilariae of onchocerca are thus deposited beneath the skin. they migrate through various tissues including the eye. those persons infected have impaired vision and up to 20% are blind. the incidence of eye lesions has been reported to be as high as 30% in central america and parts of africa.

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 B73.1 to ICD-9-CMHistory

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

ICD-9-CM
125.3 Onchocerciasis
Approximate The match is approximate rather than exact.

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 B73.1Overview

Is B73.1 (Onchocerciasis) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report onchocerciasis without eye disease on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does B73.1 group to?

When onchocerciasis without eye disease 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 B73.1?

Under the General Equivalence Mappings, onchocerciasis without eye disease converts to ICD-9-CM 125.3 (onchocerciasis). The mapping is approximate, so confirm the match fits the documentation.

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.