Specific code 2013 ICD-9-CM Diagnosis Code 033.9
Whooping cough, unspecified organism
  • Short description: Whooping cough NOS.
  • ICD-9-CM 033.9 is a billable medical code that can be used to indicate a diagnosis on a reimbursement claim, however, 033.9 should only be used for claims with a date of service on or before September 30, 2015. For claims with a date of service on or after October 1, 2015, use an equivalent ICD-10-CM code (or codes).
  • You are viewing the 2013 version of ICD-9-CM 033.9.
  • More recent version(s) of ICD-9-CM 033.9: 2014 2015.
Convert to ICD-10-CM: 033.9 converts approximately to:
  • 2015/16 ICD-10-CM A37.90 Whooping cough, unspecified species without pneumonia
Approximate Synonyms
  • Pertussis
  • Pertussis w pneumonia
  • Pneumonia in pertussis
  • Pneumonia in whooping cough
ICD-9-CM Volume 2 Index entries containing back-references to 033.9:
  • Infection, infected, infective (opportunistic) 136.9
  • Pertussis (see also Whooping cough) 033.9
    • vaccination, prophylactic (against) V03.6
  • Tussis convulsiva (see also Whooping cough) 033.9
  • Whooping cough 033.9
    • with pneumonia 033.9 [484.3]
    • vaccination, prophylactic (against) V03.6
ICD-9-CM codes are used in medical billing and coding to describe diseases, injuries, symptoms and conditions. ICD-9-CM 033.9 is one of thousands of ICD-9-CM codes used in healthcare. Although ICD-9-CM and CPT codes are largely numeric, they differ in that CPT codes describe medical procedures and services. Can't find a code? Start at the root of ICD-9-CM, check the 2013 ICD-9-CM Index or use the search engine at the top of this page to lookup any code.