ICD-10 Code A44.0 – Systemic bartonellosis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A44.0 – Systemic bartonellosis
What it is
A44.0 identifies systemic bartonellosis, a Bartonella infection that affects more than one body system. You use it when the record documents a disseminated or generalized Bartonella infection, not a localized presentation.
Clinical signs
Clinical features vary; refer to documentation. Records may describe fever, malaise, lymph node enlargement, or involvement of organs outside the initial infection site, but you should code only what is clearly documented.
When to use this code
Use A44.0 when the provider documents systemic bartonellosis, generalized Bartonella infection, or disseminated disease. It may also apply when the note clearly links Bartonella to multi-organ involvement. If the chart only says “Bartonella infection,” check documentation before assigning this code.
Do not use for
Do not use this code for a localized Bartonella condition such as a single-site presentation without systemic involvement. If the record is vague or does not confirm systemic disease, check documentation.
Coding tip
Match the code to the provider’s wording and document any confirmed systemic involvement before coding A44.0.