A37.00 ICD-10-CM Code: Whooping cough due to Bordetella pertussis without pneumonia
HCC Buddy Code Card
Digital ICD-10 code-book layout with official code detail, always-visible risk models, Code Trumping, and Buddy coding guidance.
FY 2026 Apr update / Certain infectious and parasitic diseases (A00-B99) / Other bacterial diseases (A30-A49)
A37.00
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceWhooping cough due to Bordetella pertussis without pneumonia
Whooping cough is a highly contagious respiratory infection caused by bacteria that causes severe coughing fits with a distinctive 'whooping' sound when breathing in. This code is used when the patient has whooping cough without pneumonia as a complication.
CMS-HCC V28
N/A—
Not mapped
CMS-HCC V24
N/A—
Not mapped
ACA/HHS
N/A—
Not mapped
ESRD/PACE
N/A—
Not mapped
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
Official- Paroxysmal cough due to Bordetella pertussis without pneumonia
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for A37.00 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for A37.00 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for A37.00 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for A37.00 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for A37.00 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for A37.00 in this effective period.
Buddy Documentation Tip
Last updated: FY2026 ICD-10-CM Apr update, Apr 1, 2026 through Sep 30, 2026. CMS-HCC V28 is 100% phased in for payment year 2026.
Is A37.00 an HCC code?
No. A37.00 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
Coder workflow notes
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This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
A37.00 is the ICD-10-CM diagnosis code for whooping cough due to bordetella pertussis without pneumonia. Whooping cough is a highly contagious respiratory infection caused by bacteria that causes severe coughing fits with a distinctive 'whooping' sound when breathing in. This code is used when the patient has whooping cough without pneumonia as a complication. A37.00 sits in the ICD-10-CM chapter for certain infectious and parasitic diseases (a00-b99), within the section covering other bacterial diseases (a30-a49).
A37.00 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.
Verify that pneumonia is NOT documented as a complication; if pneumonia is present, use A37.01 instead.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for A37.00 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Verify that pneumonia is NOT documented as a complication; if pneumonia is present, use A37.01 instead
- •This is a reportable disease in most jurisdictions; confirm reporting requirements are met and document the causative organism (Bordetella pertussis) clearly in the medical record