2027 ICD-10-CM Diagnosis Code A23Brucellosis

ICD-10-CM Codes›A00–B99›A20-A28›A23

ICD-10-CM A23
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

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
Short Description
Brucellosis
Same as the full description in the CMS dataset.
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

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to A23: 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 A23 itself
  • Malta fever
  • Mediterranean fever
  • undulant fever
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 A23, its category, or a range that includes it.

Code First 1

These codes say to code first a condition named in the note, and A23 is one of the conditions named.

  • M49 Spondylopathies in diseases classified elsewhere
    brucellosis (A23.-)

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.

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

Questions About A23Overview

What is the ICD-10 code for brucellosis?

A23 is the ICD-10-CM category for brucellosis, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

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.