ICD-10 Code A01 – Typhoid and paratyphoid fevers (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A01 – Typhoid and paratyphoid fevers
What it is
A01 covers typhoid fever and paratyphoid fever, which are systemic infections caused by Salmonella enterica serotypes Typhi and Paratyphi. Use it when the record identifies one of these enteric fevers.
Clinical signs
Clinical features vary; refer to documentation. Typical findings may include prolonged fever, abdominal pain, headache, malaise, and gastrointestinal symptoms, but the diagnosis should be supported by the clinician’s recorded assessment.
When to use this code
Use A01 when the provider documents typhoid fever, paratyphoid fever, or enteric fever due to Salmonella Typhi or Paratyphi. It is also appropriate when the note clearly identifies the infection as one of these conditions. If the organism or diagnosis is unclear, check documentation before coding.
Do not use for
Do not use A01 for nonspecific salmonella gastroenteritis or other Salmonella infections that are not typhoid or paratyphoid fever. If the chart only says “salmonella infection,” you need a more specific documented diagnosis.
Coding tip
Code from the provider’s stated diagnosis, not from symptoms alone; if typhoid or paratyphoid is not explicitly documented, check documentation.