ICD-10 Code A75.1 – Recrudescent typhus [Brill’s disease] (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A75.1 – Recrudescent typhus [Brill’s disease]
What it is
A75.1 identifies recrudescent typhus, also called Brill’s disease. It refers to a later reactivation of prior epidemic typhus infection, not a new primary typhus exposure.
Clinical signs
Clinical features may resemble typhus and can include fever, headache, rash, and malaise. Symptoms are often milder than classic epidemic typhus; clinical features vary, refer to documentation.
When to use this code
Use A75.1 when the record specifically documents Brill’s disease, recrudescent typhus, or reactivation of prior epidemic typhus. Code it when the clinician links the episode to a past infection rather than a new typhus exposure.
Do not use for
Do not use this code for epidemic typhus, murine typhus, or unspecified typhus. If the chart does not clearly state recrudescent typhus, check documentation.
Coding tip
Look for wording such as “Brill’s disease” or “recrudescent typhus” in the assessment, not just a generic typhus diagnosis.