ICD-10 Code A44.9 – Bartonellosis, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A44.9 – Bartonellosis, unspecified
What it is
A44.9 identifies bartonellosis when the record does not specify the Bartonella species or the exact clinical form. Use it for a documented Bartonella infection that remains nonspecific.
Clinical signs
Clinical features vary; refer to documentation. Bartonellosis may present with fever, lymph node enlargement, skin lesions, or other systemic findings depending on the infection type.
When to use this code
Use this code when the provider documents bartonellosis, Bartonella infection, or cat-scratch disease without further detail. It also fits when the chart confirms infection but does not specify the organism subtype or manifestation.
If the note names a more specific Bartonella condition, code that diagnosis instead. When documentation is unclear, check documentation before assigning A44.9.
Do not use for
Do not use A44.9 for a confirmed, more specific Bartonella diagnosis or for symptoms alone without a documented infection. Do not substitute it when the record supports another cause.
Coding tip
Look for the exact wording in the assessment and final diagnosis; if the provider gives a specific Bartonella condition, code that instead of A44.9.