ICD-10 Code A37.00 – Whooping cough due to Bordetella pertussis without pneumonia (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A37.00 – Whooping cough due to Bordetella pertussis without pneumonia
What it is
A37.00 identifies pertussis caused by Bordetella pertussis when pneumonia is not documented. Use it for confirmed whooping cough cases without a pneumonia complication.
Clinical signs
Typical findings include prolonged paroxysmal cough, inspiratory whoop, and posttussive vomiting. Clinical features vary; refer to documentation for confirmation of Bordetella pertussis.
When to use this code
Use this code when the provider documents whooping cough or pertussis due to Bordetella pertussis and specifically states no pneumonia. It also fits confirmed cases where the record clearly excludes pneumonia. If the note is incomplete, check documentation before assigning the code.
Do not use for
Do not use A37.00 if pneumonia is documented with pertussis, or if the organism is not Bordetella pertussis. Check documentation when the cause or complication is unclear.
Coding tip
Verify both the organism and the absence of pneumonia in the provider note before coding A37.00.