A37.01 Whooping cough due to Bordetella pertussis with pneumonia

Billable ICD-10-CM code, FY2026. Acts as a Major Complication or Comorbidity (MCC) as a secondary diagnosis.

Applicable to

• Paroxysmal cough due to Bordetella pertussis with pneumonia

MS-DRG index

Defines the logic of DRG(s) 202-203 in MDC 04.

Approximate ICD-9-CM (GEMs)

• 033.0 Whooping cough due to bordetella pertussis [B. pertussis] (approximate)
• 484.3 Pneumonia in whooping cough (approximate)

Code annotations containing back-references to A37.01

Back-references to A37.0

• Type 1 Excludes: R05 Cough ("paroxysmal cough due to Bordetella pertussis (A37.0-)")

Back-references to A37

• Type 1 Excludes: J17 Pneumonia in diseases classified elsewhere ("whooping cough with pneumonia (A37 with fifth-character 1)")

Diagnosis Index entries for A37.01

• Cough (affected) (epidemic) (nervous) › paroxysmal, due to Bordetella pertussis (without pneumonia) › with pneumonia
• Pneumonia (acute) (double) (migratory) (purulent) (septic) (unresolved) › in (due to) › whooping cough › due to › Bordetella pertussis
• Whooping cough › with pneumonia › due to Bordetella › pertussis
• Whooping cough › due to › Bordetella › pertussis › with pneumonia

Nearby codes

• A37 Whooping cough
• A37.0 Whooping cough due to Bordetella pertussis
• A37.00 Whooping cough due to Bordetella pertussis without pneumonia
• A37.01 Whooping cough due to Bordetella pertussis with pneumonia (this code)
• A37.1 Whooping cough due to Bordetella parapertussis
• A37.10 Whooping cough due to Bordetella parapertussis without pneumonia
• A37.11 Whooping cough due to Bordetella parapertussis with pneumonia
• A37.8 Whooping cough due to other Bordetella species
• A37.80 Whooping cough due to other Bordetella species without pneumonia