A37.90 Whooping cough, unspecified species without pneumonia

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

MS-DRG index

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

Approximate ICD-9-CM (GEMs)

• 033.9 Whooping cough, unspecified organism (approximate)

Code annotations containing back-references to A37.90

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 A37.90

• Meningitis (basal) (basic) (brain) (cerebral) (cervical) (congestive) (diffuse) (hemorrhagic) (infantile) (membranous) (metastatic) (nonspecific) (pontine) (progressive) (simple) (spinal) (subacute) (sympathetic) (toxic) › in (due to) › whooping cough
• Pertussis
• Whooping cough

Nearby codes

• 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
• A37.81 Whooping cough due to other Bordetella species with pneumonia
• A37.9 Whooping cough, unspecified species
• A37.90 Whooping cough, unspecified species without pneumonia (this code)
• A37.91 Whooping cough, unspecified species with pneumonia