ICD-10 Code A37.10 – Whooping cough due to Bordetella parapertussis without pneumonia (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code A37.10 – Whooping cough due to Bordetella parapertussis without pneumonia
What it is
This code identifies a diagnosis of whooping cough caused by Bordetella parapertussis, with no pneumonia documented. Use it when the record clearly names this organism and notes the infection is not complicated by pneumonia.
Clinical signs
Typical features include a prolonged paroxysmal cough, possible inspiratory whoop, and posttussive vomiting. Clinical features vary; refer to documentation, especially when the organism is confirmed or specifically attributed in the chart.
When to use this code
Use A37.10 when the clinician documents pertussis due to Bordetella parapertussis and explicitly states that pneumonia is absent. This may be supported by a definitive diagnosis, culture, or other documented confirmation in the medical record.
If the note says “whooping cough” without naming the organism, check documentation before coding this specific subtype. Code the more specific diagnosis only when the chart supports Bordetella parapertussis and no pneumonia.
Do not use for
Do not use this code for pertussis due to Bordetella pertussis, unspecified whooping cough, or cases with documented pneumonia. Check documentation if the organism or complication is unclear.
Coding tip
Assign this code only when both the organism and the absence of pneumonia are documented.