ICD-10 Code A01.1 – Paratyphoid fever A (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A01.1 – Paratyphoid fever A
What it is
Paratyphoid fever A is a systemic bacterial infection caused by Salmonella Paratyphi A. Use this code for confirmed or documented paratyphoid fever A, not for nonspecific febrile illness.
Clinical signs
Typical findings include fever, headache, malaise, abdominal discomfort, and sometimes diarrhea or constipation. Clinical features vary; refer to documentation, especially when the diagnosis is based on cultures or other confirmed evidence.
When to use this code
Use A01.1 when the provider documents paratyphoid fever A, paratyphoid infection due to Salmonella Paratyphi A, or an equivalent confirmed diagnosis. It may also apply when the record clearly identifies the organism and the illness as paratyphoid fever. Check documentation if only “enteric fever” or “typhoid-like illness” is stated.
Do not use for
Do not use this code for typhoid fever, paratyphoid fever B or C, or other unspecified Salmonella infections. If the organism or fever type is not clearly documented, check documentation.
Coding tip
Code A01.1 only when the record specifically identifies paratyphoid fever A or Salmonella Paratyphi A.