ICD-10 Code A01.0 – Typhoid fever (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A01.0 – Typhoid fever
What it is
A01.0 identifies typhoid fever, a systemic infection caused by Salmonella Typhi. Use it when the record documents typhoid fever specifically, not an unspecified Salmonella infection.
Clinical signs
Clinical features vary; refer to documentation. Typical findings may include prolonged fever, headache, abdominal pain, constipation or diarrhea, and systemic illness.
When to use this code
Use A01.0 when the provider clearly diagnoses typhoid fever or confirms Salmonella Typhi infection. You should code it from the final assessment, discharge summary, or problem list when the condition is active or treated during the encounter.
If the note only says “Salmonella infection” or another enteric fever without naming typhoid, check documentation before assigning this code. Do not infer typhoid from travel history or gastrointestinal symptoms alone.
Do not use for
Do not use A01.0 for nonspecific gastroenteritis, food poisoning, or other Salmonella infections. If the chart does not specify typhoid fever, check documentation.
Coding tip
Code A01.0 only when typhoid fever is explicitly documented; otherwise, query or use the more specific documented diagnosis.