ICD-10 Code A77.3 – Spotted fever due to Rickettsia australis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A77.3 – Spotted fever due to Rickettsia australis
What it is
A77.3 identifies spotted fever caused by Rickettsia australis, a tick-borne rickettsial infection. Use it when documentation names this specific organism and illness.
Clinical signs
Typical features include acute fever, headache, rash, and a history of tick exposure. Clinical features vary; refer to documentation for confirmatory details.
When to use this code
Use A77.3 when the provider documents spotted fever due to Rickettsia australis, Australian spotted fever, or an equivalent confirmed diagnosis. It may appear after exposure history, compatible symptoms, and clinical assessment. If the organism is not specified, check documentation before coding.
Do not use for
Do not use this code for other spotted fever group infections, unspecified rickettsiosis, or suspected exposure without a documented diagnosis. Check documentation.
Coding tip
Code A77.3 only when the record clearly links the illness to Rickettsia australis.