ICD-10 Code A23.0 – Brucellosis due to Brucella melitensis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A23.0 – Brucellosis due to Brucella melitensis
What it is
A23.0 identifies brucellosis caused by Brucella melitensis, a bacterial infection usually acquired from infected animals or contaminated dairy products. Use this code when the documentation specifies B. melitensis as the cause.
Clinical signs
Typical findings include fever, sweats, fatigue, malaise, and musculoskeletal pain. Clinical features vary; refer to documentation for the confirmed organism and presentation.
When to use this code
Use A23.0 when the provider documents brucellosis due to Brucella melitensis, whether acute or ongoing, and the organism is named in the record. It may appear with systemic illness, focal joint pain, or other documented complications. Check documentation if the species is not stated.
Do not use for
Do not use this code for brucellosis from another Brucella species or when the organism is unspecified. If the chart only says “brucellosis,” choose the unspecified code unless documentation supports B. melitensis.
Coding tip
Code the organism exactly as documented; species detail changes the ICD-10 assignment.