A08.32 ICD-10-CM Code: Astrovirus enteritis
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FY 2026 Apr update / Certain infectious and parasitic diseases (A00-B99) / Intestinal infectious diseases (A00-A09)
A08.32
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceAstrovirus enteritis
Astrovirus enteritis is an infection of the stomach and intestines caused by the astrovirus, a virus that typically causes watery diarrhea, nausea, and vomiting. This condition is most common in young children, elderly people, and those with weakened immune systems.
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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Inclusion Terms
OfficialICD-10-CM does not list inclusion terms for A08.32 in this effective period.
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for A08.32 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for A08.32 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for A08.32 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for A08.32 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for A08.32 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for A08.32 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 A08.32 an HCC code?
No. A08.32 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
A08.32 is the ICD-10-CM diagnosis code for astrovirus enteritis. Astrovirus enteritis is an infection of the stomach and intestines caused by the astrovirus, a virus that typically causes watery diarrhea, nausea, and vomiting. This condition is most common in young children, elderly people, and those with weakened immune systems. A08.32 sits in the ICD-10-CM chapter for certain infectious and parasitic diseases (a00-b99), within the section covering intestinal infectious diseases (a00-a09).
A08.32 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 astrovirus has been confirmed through laboratory testing (stool culture or antigen detection) before assigning this code, as it requires specific identification rather than presumptive diagnosis.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for A08.32 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Verify that astrovirus has been confirmed through laboratory testing (stool culture or antigen detection) before assigning this code, as it requires specific identification rather than presumptive diagnosis
- •Do not use this code for other viral gastroenteritis cases; ensure documentation specifically mentions astrovirus to differentiate from other viral causes like rotavirus or norovirus