ICD-10 Code A70 – Chlamydia psittaci infections (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A70 – Chlamydia psittaci infections
What it is
A70 identifies infection caused by Chlamydia psittaci, an organism associated with psittacosis. Use it when the record documents this specific chlamydial infection, not other chlamydial diseases.
Clinical signs
Clinical features vary; refer to documentation. Commonly reported findings include fever, headache, cough, and atypical pneumonia, but you should code only when the provider documents Chlamydia psittaci infection.
When to use this code
Use A70 when the diagnosis is clearly documented as psittacosis or Chlamydia psittaci infection. It may also apply when the provider states infection due to this organism without further site detail. If the chart only suggests exposure or a different chlamydial condition, check documentation.
Do not use for
Do not use A70 for unspecified chlamydial infections, other bacterial pneumonias, or respiratory illness without documented Chlamydia psittaci. If the organism is not confirmed or named, check documentation.
Coding tip
Code A70 only when the provider links the infection to Chlamydia psittaci by name or equivalent diagnosis wording.