A32.9 ICD-10-CM Code: Listeriosis, unspecified
HCC Buddy Code Card
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FY 2026 Apr update / Certain infectious and parasitic diseases (A00-B99) / Other bacterial diseases (A30-A49)
A32.9
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceListeriosis, unspecified
A bacterial infection caused by Listeria monocytogenes that affects various body systems, but the specific type or location of infection is not documented. This is a serious infection that can affect the brain, bloodstream, or other organs.
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
Code Trumping
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Code Book Path
Inclusion Terms
OfficialICD-10-CM does not list inclusion terms for A32.9 in this effective period.
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for A32.9 in this effective period.
Related Child Codes
Includes
Official- listerial foodborne infection
Excludes 1
Official- neonatal (disseminated) listeriosis (P37.2)
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for A32.9 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for A32.9 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for A32.9 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 A32.9 an HCC code?
No. A32.9 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
A32.9 is the ICD-10-CM diagnosis code for listeriosis, unspecified. A bacterial infection caused by Listeria monocytogenes that affects various body systems, but the specific type or location of infection is not documented. This is a serious infection that can affect the brain, bloodstream, or other organs. A32.9 sits in the ICD-10-CM chapter for certain infectious and parasitic diseases (a00-b99), within the section covering other bacterial diseases (a30-a49).
A32.9 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.
Use this code only when the documentation does not specify the type of listeriosis (such as meningitis, bacteremia, or pregnancy-related); query the provider for more specific clinical details when possible.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for A32.9 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Use this code only when the documentation does not specify the type of listeriosis (such as meningitis, bacteremia, or pregnancy-related); query the provider for more specific clinical details when possible
- •Listeriosis is typically treated with antibiotics and may require hospitalization; ensure the severity and any complications are documented to support medical necessity