ICD-10 Code A23 – Brucellosis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A23 – Brucellosis
What it is
A23 identifies brucellosis, a bacterial infection caused by Brucella species. It is usually acquired through contact with infected animals or contaminated animal products.
Clinical signs
Clinical features vary; refer to documentation. Common findings include fever, sweats, fatigue, and muscle or joint pain, with possible hepatosplenomegaly or other focal involvement.
When to use this code
Use A23 when the provider documents brucellosis or a confirmed Brucella infection. It also fits cases described as undulant fever, Malta fever, or other documented brucellosis presentations. Code the specific site or complication only when clearly documented.
Do not use for
Do not use A23 for suspected exposure without confirmed infection. If the record describes another zoonotic or febrile illness, check documentation and code the stated diagnosis instead.
Coding tip
Verify the organism and any documented complication before assigning A23, and follow the record when a more specific brucellosis code is available.