ICD-10 Code A23.9 – Brucellosis, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A23.9 – Brucellosis, unspecified
What it is
A23.9 identifies brucellosis when the organism or clinical form is not further specified. Use it for a documented Brucella infection without a more precise subtype.
Clinical signs
Clinical features vary; refer to documentation. Common findings in brucellosis include fever, sweats, malaise, fatigue, and musculoskeletal pain, but the chart must support the diagnosis.
When to use this code
Use A23.9 when the provider documents brucellosis but does not identify the species or a more specific manifestation. It also fits cases where the record confirms infection yet remains nonspecific.
If later notes clarify the organism or a localized complication, code the more specific diagnosis instead. Check documentation for confirmed exposure history, culture results, or an explicit provider diagnosis.
Do not use for
Do not use this code for suspected brucellosis without confirmation, or for a different zoonotic infection. If the chart names a specific Brucella type or complication, use the appropriate more specific code.
Coding tip
Always code to the highest documented specificity and query when the record only says “brucellosis” but leaves the type or manifestation unclear.