2026 ICD-10-CM Diagnosis Code A23Brucellosis

ICD-10-CM CodesA00–B99A20-A28A23

ICD-10-CM A23
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

A23 is a non-billable ICD-10-CM category code for brucellosis, so it cannot be submitted on claims. Use a more specific code from this category instead, such as A23.0, A23.1, A23.2, and A23.3.

Code Identity

ICD-10-CM Code
A23
Billable Status
No — Non-Billable Category
Code Describes
Brucellosis
Chapter
A20-A28
Certain zoonotic bacterial diseases

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionA20-A28Certain zoonotic bacterial diseases
CategoryA23Brucellosis
This CodeA23Brucellosis

Specific Coding for BrucellosisOverview

Non-specific codes like A23 require more characters. Use one of these billable codes instead:

  • Use A23.0 for Brucellosis due to Brucella melitensis

  • Use A23.1 for Brucellosis due to Brucella abortus

  • Use A23.2 for Brucellosis due to Brucella suis

  • Use A23.3 for Brucellosis due to Brucella canis

  • Use A23.8 for Other brucellosis

  • Use A23.9 for Brucellosis, unspecified

Tabular List NotesGuidance

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

Includes

  • Malta fever
  • Mediterranean fever
  • undulant fever

Clinical InformationClinical

  • Brucellosis

    infection caused by bacteria of the genus brucella mainly involving the mononuclear phagocyte system. this condition is characterized by fever, weakness, malaise, and weight loss.
  • Brucellosis, Bovine

    a disease of cattle caused by bacteria of the genus brucella leading to abortion in late pregnancy. brucella abortus is the primary infective agent.

Patient EducationClinical

Animal Diseases and Your Health

Animal diseases that people can catch are called zoonoses. Many diseases affecting humans can be traced to animals or animal products. You can get a disease directly from an animal, or indirectly, through the environment.

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 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About A23Overview

Is A23 (Brucellosis) a billable code?

No. This is a category header that groups the codes for brucellosis, and headers cannot be submitted on claims. Claims for brucellosis need a more specific code from this category, such as A23.0, A23.1, and A23.2.