ICD-10 Code A79.1 – Rickettsialpox due to Rickettsia akari (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A79.1 – Rickettsialpox due to Rickettsia akari
What it is
A79.1 identifies rickettsialpox, an infection caused by Rickettsia akari. Use it when the record specifically documents this organism or the named disease.
Clinical signs
Typical findings include a papular or vesicular rash, fever, and a history consistent with mite exposure. Clinical features vary; refer to documentation.
When to use this code
Use A79.1 when the provider diagnoses rickettsialpox or documents Rickettsia akari as the cause. It is appropriate for confirmed cases and for encounters where the diagnosis is established in the chart.
If the note only says “rickettsial infection” or another rickettsiosis without naming rickettsialpox, check documentation before coding. Code the documented condition, not a presumed organism.
Do not use for
Do not use this code for unspecified rickettsial disease or for other spotted fever group infections. If the chart does not clearly identify rickettsialpox, check documentation.
Coding tip
Look for the exact organism name or the specific term “rickettsialpox” before assigning A79.1.