A37.01 ICD-10-CM Code: Whooping cough due to Bordetella pertussis with pneumonia
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FY 2026 Apr update / Certain infectious and parasitic diseases (A00-B99) / Other bacterial diseases (A30-A49)
A37.01
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceWhooping cough due to Bordetella pertussis with pneumonia
Whooping cough (pertussis) is a highly contagious bacterial infection caused by Bordetella pertussis that causes severe coughing fits with a distinctive 'whooping' sound when breathing in. This code specifically indicates the infection has progressed to include pneumonia (lung inflammation).
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 with pneumonia
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for A37.01 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for A37.01 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for A37.01 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for A37.01 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for A37.01 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for A37.01 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 A37.01 an HCC code?
No. A37.01 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
A37.01 is the ICD-10-CM diagnosis code for whooping cough due to bordetella pertussis with pneumonia. Whooping cough (pertussis) is a highly contagious bacterial infection caused by Bordetella pertussis that causes severe coughing fits with a distinctive 'whooping' sound when breathing in. This code specifically indicates the infection has progressed to include pneumonia (lung inflammation). A37.01 sits in the ICD-10-CM chapter for certain infectious and parasitic diseases (a00-b99), within the section covering other bacterial diseases (a30-a49).
A37.01 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.
This code includes both the pertussis infection and the pneumonia complication, so do not code pneumonia separately unless it is due to a different organism.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for A37.01 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •This code includes both the pertussis infection and the pneumonia complication, so do not code pneumonia separately unless it is due to a different organism
- •Verify documentation confirms both whooping cough due to Bordetella pertussis AND pneumonia before assigning this code; if only pertussis without pneumonia is documented, use A37.00 instead