ICD-10 Code A75.9 – Typhus fever, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A75.9 – Typhus fever, unspecified
What it is
A75.9 identifies typhus fever when the type is not specified in the record. Use it for a documented typhus infection without enough detail to name the exact organism or category.
Clinical signs
Clinical features vary; refer to documentation. Typhus commonly presents as an acute febrile illness with systemic symptoms, and the chart should support a clinician’s diagnosis of typhus fever.
When to use this code
Use A75.9 when the provider documents typhus fever but does not specify the subtype. It also fits when the record confirms typhus, yet available information is insufficient for a more specific code. Check documentation if another rickettsial diagnosis is named.
Do not use for
Do not use this code for other rickettsial illnesses, such as spotted fever or scrub typhus, when a more specific diagnosis is documented. Also avoid it when typhus is only suspected or ruled out.
Coding tip
If the note names a specific typhus type, code that diagnosis instead of the unspecified code.