ICD-10 Code A01.00 – Typhoid fever, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A01.00 – Typhoid fever, unspecified
What it is
A01.00 identifies typhoid fever when the record does not specify the organism details or complications. Use it for a documented typhoid infection without further classification.
Clinical signs
Clinical features vary; refer to documentation. Typical typhoid illness may include prolonged fever, headache, abdominal pain, and gastrointestinal symptoms, but you should code only what the provider documents.
When to use this code
Use A01.00 when the diagnosis is typhoid fever and the chart does not name a more specific code. It fits encounters where the provider confirms typhoid but leaves the type or detail unspecified. If the record later identifies a more specific form, update the code accordingly.
Do not use for
Do not use this code for paratyphoid fever, carrier status, or a different Salmonella infection. Check documentation if the note only says suspected, exposure, or enteric fever without a confirmed typhoid diagnosis.
Coding tip
Code only confirmed typhoid fever and query for specificity when the organism or complication is not clearly documented.