2021 ICD-10-CM Code A37.9

Whooping cough, unspecified species

Version 2021

Not Valid for Submission

A37.9 is a non-specific and non-billable diagnosis code code, consider using a code with a higher level of specificity for a diagnosis of whooping cough, unspecified species. The code is not specific and is NOT valid for the year 2021 for the submission of HIPAA-covered transactions. Category or Header define the heading of a category of codes that may be further subdivided by the use of 4th, 5th, 6th or 7th characters.

Unspecified diagnosis codes like A37.9 are acceptable when clinical information is unknown or not available about a particular condition. Although a more specific code is preferable, unspecified codes should be used when such codes most accurately reflect what is known about a patient's condition. Specific diagnosis codes should not be used if not supported by the patient's medical record.

ICD-10:A37.9
Short Description:Whooping cough, unspecified species
Long Description:Whooping cough, unspecified species

Code Classification

Specific Coding for Whooping cough, unspecified species

Non-specific codes like A37.9 require more digits to indicate the appropriate level of specificity. Consider using any of the following ICD-10 codes with a higher level of specificity when coding for whooping cough, unspecified species:

  • BILLABLE CODE - Use A37.90 for Whooping cough, unspecified species without pneumonia
  • BILLABLE CODE - Use A37.91 for Whooping cough, unspecified species with pneumonia

Information for Patients


Whooping Cough

Also called: Pertussis

Whooping cough is an infectious bacterial disease that causes uncontrollable coughing. The name comes from the noise you make when you take a breath after you cough. You may have choking spells or may cough so hard that you vomit.

Anyone can get whooping cough, but it is more common in infants and children. It's especially dangerous for infants. The coughing spells can be so bad that it is hard for infants to eat, drink, or breathe.

To make a diagnosis, your doctor may do a physical exam, blood tests, chest x-rays, or nose or throat cultures.

Before there was a vaccine, whooping cough was one of the most common childhood diseases and a major cause of childhood deaths in the U.S. Now most cases are prevented by vaccines. If you have whooping cough, treatment with antibiotics may help if given early.

Centers for Disease Control and Prevention


[Learn More in MedlinePlus]

Code History

  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016 (First year ICD-10-CM implemented into the HIPAA code set)