ICD-10 Code A77.9 – Spotted fever, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A77.9 – Spotted fever, unspecified
What it is
A77.9 identifies spotted fever when the specific type is not documented. Use it for a suspected or confirmed rickettsial spotted fever illness without a more specific code.
Clinical signs
Clinical features vary; refer to documentation. Commonly reported findings include fever, headache, rash, and a history of tick exposure or travel to an endemic area.
When to use this code
Use this code when the record states spotted fever, but the provider does not name a specific subtype. It is appropriate for final diagnoses, discharge summaries, or problem lists when documentation remains nonspecific. If the chart identifies a more exact rickettsial illness, code that instead.
Do not use for
Do not use A77.9 when the documentation names a specific spotted fever group infection or another rickettsiosis. Check documentation if the record only mentions fever, rash, or tick bite without a stated diagnosis.
Coding tip
Query the provider when “spotted fever” appears without confirmation of the organism or subtype.