2027 ICD-10-CM Diagnosis Code B73Onchocerciasis

ICD-10-CM Codes›A00–B99›B65-B83›B73

ICD-10-CM B73
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

B73 is a non-billable ICD-10-CM category code for onchocerciasis, so it cannot be submitted on claims. Use a more specific code from this category instead, such as B73.00, B73.01, B73.02, and B73.09.

Code Identity

ICD-10-CM Code
B73
Billable Status
No — Non-Billable Category
Code Describes
Onchocerciasis
Short Description
Onchocerciasis
Same as the full description in the CMS dataset.
Chapter
B65-B83
Helminthiases

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionB65-B83Helminthiases
CategoryB73Onchocerciasis
This CodeB73Onchocerciasis

Specific Coding for OnchocerciasisOverview

Non-specific codes like B73 require more characters. Use one of these billable codes instead:

  • B73.0 for Onchocerciasis with eye disease

  • Use B73.00 for Onchocerciasis with eye involvement, unspecified

  • Use B73.01 for Onchocerciasis with endophthalmitis

  • Use B73.02 for Onchocerciasis with glaucoma

  • Use B73.09 for Onchocerciasis with other eye involvement

  • Use B73.1 for Onchocerciasis without eye disease

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to B73: 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 B73 itself
  • 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, its category, or a range that includes it.

Applicable To 1

These notes mention B73.

  • 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: its condition is not part of those codes, and both may be reported when the patient has both.

  • B74 Filariasis
    onchocerciasis (B73)

Code First 1

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

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.

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 B73Overview

What is the ICD-10 code for onchocerciasis?

B73 is the ICD-10-CM category for onchocerciasis, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

Is B73 (Onchocerciasis) a billable code?

No. This is a category header that groups the codes for onchocerciasis, and headers cannot be submitted on claims. Claims for onchocerciasis need a more specific code from this category, such as B73.00, B73.01, and B73.02.