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    v1.0.28
    OpenPayerBilling CodesOther bacterial diseasesICD-10-CM a37-whooping-cough
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    ICD-10-CM Code For Whooping Cough: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group A37 includes diagnoses for pertussis (whooping cough), covering classical pertussis, parapertussis, and cases with specified complications such as pneumonia or encephalopathy. These ICD-10-CM diagnosis codes are used to document acute respiratory infection presentations, capture disease severity, organ system complications, and clinical complexity relevant to infectious respiratory diseases. Accurate coding within the ICD-10-CM A37 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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    ICD-10-CM A37: Whooping Cough Overview

    The ICD-10-CM A37 group represents diagnoses for pertussis, commonly known as whooping cough, an infectious disease of the respiratory system caused by Bordetella pertussis and related organisms. These codes capture acute respiratory infection presentations with varying severity and complications, including pneumonia and encephalopathy. Accurate coding matters for proper claim processing and to reflect clinical severity for reimbursement and public health reporting.

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    When to Use

    Use a code from this group when the clinical record documents a diagnosis of pertussis or whooping cough, including cases with specified complications like pneumonia or encephalopathy. Select the most specific code that reflects the causative organism and any associated complications to accurately represent the clinical encounter.

    ICD-10-CM Codes

    8 rows

    ICD-10-CM CodeDescription
    A37.00Whooping cough due to Bordetella pertussis without pneumonia
    A37.01Whooping cough due to Bordetella pertussis with pneumonia
    A37.10Whooping cough due to Bordetella parapertussis without pneumonia
    A37.11Whooping cough due to Bordetella parapertussis with pneumonia
    A37.80Whooping cough due to other Bordetella species without pneumonia
    A37.81Whooping cough due to other Bordetella species with pneumonia
    A37.90Whooping cough, unspecified species without pneumonia
    A37.91Whooping cough, unspecified species with pneumonia

    DRG Codes

    2 rows

    DRG CodeDescription
    202Bronchitis and Asthma with CC/MCC
    203Bronchitis and Asthma without CC/MCC

    Typical Clinical Scenarios

    • An unvaccinated infant aged 3 months presents to the emergency department with severe paroxysmal coughing spells, whooping on inspiration, posttussive emesis, and episodes of apnea. Nasopharyngeal PCR confirms Bordetella pertussis and the infant requires admission for close monitoring and supportive care for acute pertussis. Typical codes: A37.00, A37.01
    • An adult with a recent upper respiratory prodrome develops prolonged, severe nocturnal cough lasting several weeks without pneumonia; outpatient testing is positive for Bordetella pertussis but there is no documented bronchopneumonia or respiratory failure. The diagnosis is assigned to capture pertussis as the primary infectious cause of the persistent cough in the ambulatory setting. Typical codes: A37.90, A37.91
    • A hospitalized child with confirmed pertussis who develops secondary bacterial bronchopneumonia requiring intravenous antibiotics and respiratory support; the pertussis is identified as the underlying infectious cause complicating the hospital course. Typical codes: A37.10, A37.11

    Related Codes

    A30-LEPROSY-HANSEN-S-DISEASE

    ICD-10-CM Code For Leprosy Hansen's Disease: Group Overview

    A31-INFECTION-DUE-TO-OTHER-MYCOBACTERIA

    ICD-10-CM Code For Infection Due To Other Mycobacteria: Group Overview

    A32-LISTERIOSIS

    ICD-10-CM Code For Listeriosis: Group Overview

    A33-TETANUS-NEONATORUM

    ICD-10-CM Code For Tetanus Neonatorum: Group Overview

    A34-OBSTETRICAL-TETANUS

    ICD-10-CM Code For Obstetrical Tetanus: Group Overview

    A35-OTHER-TETANUS

    ICD-10-CM Code For Other Tetanus: Group Overview

    A36-DIPHTHERIA

    ICD-10-CM Code For Diphtheria: Group Overview

    A38-SCARLET-FEVER

    ICD-10-CM Code For Scarlet Fever: Group Overview

    A39-MENINGOCOCCAL-INFECTION

    ICD-10-CM Code For Meningococcal Infection: Group Overview

    A41-OTHER-SEPSIS

    ICD-10-CM Code For Other Sepsis: Group Overview

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    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
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