NPI Atlas

A23 – Brucellosis

ICD-10-CM 2027 diagnosis code · Certain zoonotic bacterial diseases

Non-billable header

ICD-10-CM code A23

Code: A23 (claims format: A23)
Description: Brucellosis
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 1. Certain infectious and parasitic diseases (A00-B99)
Block: A20-A28 Certain zoonotic bacterial diseases

Billable codes under A23

A23 is a header code and cannot be used on claims. Choose the most specific code:

A23.0 – Brucellosis due to Brucella melitensisBillable
A23.1 – Brucellosis due to Brucella abortusBillable
A23.2 – Brucellosis due to Brucella suisBillable
A23.3 – Brucellosis due to Brucella canisBillable
A23.8 – Other brucellosisBillable
A23.9 – Brucellosis, unspecifiedBillable

Notes for A23

Includes:

Malta fever
Mediterranean fever
undulant fever

Frequently asked questions

What is ICD-10 code A23?

A23 is the ICD-10-CM code for brucellosis, in the block A20-A28 (Certain zoonotic bacterial diseases).

Is A23 a billable code?

No. A23 is a header code with more specific child codes; report one of the billable codes listed above.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.