ICD-10 Code A01.3 – Paratyphoid fever C (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A01.3 – Paratyphoid fever C
What it is
A01.3 identifies paratyphoid fever C, a systemic Salmonella infection caused by Salmonella Paratyphi C. Use it when the record specifically documents this organism or diagnosis.
Clinical signs
Clinical features vary; refer to documentation. Typical typhoid-like illness may include fever, headache, malaise, abdominal symptoms, and sometimes diarrhea or constipation.
When to use this code
Use A01.3 when the provider documents paratyphoid fever C, paratyphoid infection due to Salmonella Paratyphi C, or an equivalent confirmed diagnosis. Code it from the medical record, not from suspicion alone. If the organism is not specified, check documentation before assigning a paratyphoid code.
Do not use for
Do not use this code for typhoid fever, other paratyphoid types, or nonspecific Salmonella gastroenteritis. If the chart only says “Salmonella infection,” check documentation.
Coding tip
Verify the exact serotype or provider statement, because paratyphoid codes are organism-specific.