A37.11 ICD-10-CM Code: Whooping cough due to Bordetella parapertussis with pneumonia
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FY 2026 Apr update / Certain infectious and parasitic diseases (A00-B99) / Other bacterial diseases (A30-A49)
A37.11
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceWhooping cough due to Bordetella parapertussis with pneumonia
This is a bacterial infection caused by Bordetella parapertussis that causes severe coughing fits (whooping cough) and has progressed to include pneumonia (lung inflammation). It's a contagious respiratory illness that primarily affects the lungs and airways.
CMS-HCC V28
00
RAF 0
CMS-HCC V24
00
RAF 0
ACA/HHS
00
RAF 0
ESRD/PACE
00
RAF 0
RXHCC
00
RAF 0
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Code Book Path
Inclusion Terms
OfficialICD-10-CM does not list inclusion terms for A37.11 in this effective period.
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for A37.11 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for A37.11 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for A37.11 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for A37.11 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for A37.11 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for A37.11 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 A37.11 an HCC code?
No. A37.11 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
A37.11 is the ICD-10-CM diagnosis code for whooping cough due to bordetella parapertussis with pneumonia. This is a bacterial infection caused by Bordetella parapertussis that causes severe coughing fits (whooping cough) and has progressed to include pneumonia (lung inflammation). It's a contagious respiratory illness that primarily affects the lungs and airways. A37.11 sits in the ICD-10-CM chapter for certain infectious and parasitic diseases (a00-b99), within the section covering other bacterial diseases (a30-a49).
A37.11 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 documentation specifies both the whooping cough diagnosis AND pneumonia as a complication; both conditions must be documented to justify this combination code.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for A37.11 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Verify documentation specifies both the whooping cough diagnosis AND pneumonia as a complication; both conditions must be documented to justify this combination code
- •Confirm the causative organism is identified as Bordetella parapertussis (not Bordetella pertussis, which uses code A37.01); organism identification should be supported by culture or lab results in the medical record