ICD-10 Code A75.3 – Typhus fever due to Rickettsia tsutsugamushi (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A75.3 – Typhus fever due to Rickettsia tsutsugamushi
What it is
A75.3 identifies typhus fever caused by Rickettsia tsutsugamushi, also called scrub typhus. Use it when the record documents this specific rickettsial infection, not a nonspecific febrile illness.
Clinical signs
Typical findings include acute fever, headache, and rash; an eschar or lymphadenopathy may be documented. Clinical features vary; refer to documentation.
When to use this code
Use this code when the provider clearly documents scrub typhus, typhus fever due to Rickettsia tsutsugamushi, or an equivalent confirmed diagnosis. It may also apply when the condition is listed as the reason for evaluation or treatment. Check documentation if the chart only says “rickettsial infection.”
Do not use for
Do not use A75.3 for typhus caused by another organism or for unspecified rickettsiosis. Do not assign it when scrub typhus is only suspected and not documented as the final diagnosis.
Coding tip
Verify the organism name in the note; “tsutsugamushi” supports A75.3, while broader rickettsial wording may require a different code.