2027 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 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

B73.1 is a billable ICD-10-CM diagnosis code for onchocerciasis without eye disease. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 867 through 869. 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 13 closely related codes. 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

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to B73.1: its own notes plus those printed at B73 and 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.

From B73 Onchocerciasis applies to 5 codes
  • onchocerca volvulus infection
  • onchocercosis
  • river blindness
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 B73.1, its category, or a range that includes it.

Applicable To 1

These notes mention B73.1.

  • 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

Excludes2 1

These codes carry an Excludes2 note naming B73.1: its condition is not part of those codes, and both may be reported when the patient has both.

  • B74 Filariasis
    onchocerciasis (B73) names B73, which includes this code

Code First 1

These codes say to code first a condition named in the note, and B73.1 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

  • Onchocerciasis

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

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

Questions About B73.1Overview

What is the ICD-10 code for onchocerciasis without eye disease?

The ICD-10-CM code for onchocerciasis without eye disease is B73.1 (sometimes written as B731). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

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, 2026 through September 30, 2027.

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, 869, 868, with relative weights from 0.6784 to 2.1855 depending on complications. Higher weights mean higher Medicare reimbursement.

Is B73.1 a CC or MCC?

CMS lists B73.1 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 13 closely related codes in its exclusion list.

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.