ICD-10 Code A79.8 – Other specified rickettsioses (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A79.8 – Other specified rickettsioses
What it is
A79.8 is used for rickettsial infections that are identified as a specific type but do not have their own dedicated ICD-10-CM code. It covers a confirmed or documented rickettsiosis that is not otherwise classified.
Clinical signs
Clinical features vary; refer to documentation. Rickettsioses commonly present with acute febrile illness and may include headache, rash, or a history of tick or arthropod exposure.
When to use this code
Use A79.8 when the record clearly identifies an “other specified” rickettsiosis and the organism or syndrome is not captured by a more specific code. Code it when the provider documents a rickettsial infection that does not fit a listed category. If the note is vague or incomplete, check documentation before assigning this code.
Do not use for
Do not use this code for unspecified rickettsial infection when the documentation lacks detail. Also avoid it when a more specific rickettsiosis code is supported by the record.
Coding tip
Look for the exact provider wording; “other specified” supports A79.8 only when the chart rules out a more specific rickettsial diagnosis.