ICD-10 Code A01.4 – Paratyphoid fever, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A01.4 – Paratyphoid fever, unspecified
What it is
A01.4 identifies paratyphoid fever when the specific Salmonella paratyphi type is not documented. Use it for a clinically diagnosed enteric fever that is recorded as paratyphoid, but not further specified.
Clinical signs
Clinical features vary; refer to documentation. Typical enteric fever findings may include prolonged fever, headache, abdominal discomfort, and gastrointestinal symptoms, but you should code only what is documented.
When to use this code
Use A01.4 when the record states paratyphoid fever without naming A, B, or C, or when the provider documents an unspecified paratyphoid infection. It also fits when the note confirms paratyphoid fever but does not provide enough detail for a more specific code. Check documentation if typhoid fever or another infection is also mentioned.
Do not use for
Do not use this code for typhoid fever, carrier states, or gastroenteritis without a documented paratyphoid diagnosis. If the record names a specific paratyphoid organism, use the more specific code instead.
Coding tip
Code A01.4 only when “unspecified” is supported in the chart; otherwise, query for the exact paratyphoid type.