ICD-10-CM
ICD-10 code for Stomach flu: A08.4
The CDC title for "Stomach flu" is A08 (Viral and other specified intestinal infections), a header that is not billable. When nothing more specific is documented, the billable code is A08.4, Viral intestinal infection, unspecified.
Source: CDC ICD-10-CM FY2027 order file dated June 16, 2026. Publisher page
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Codes under A08, then other CDC titles that name viral intestinal infection
A header groups codes and is not billed. A billable code is one you can report.
- A08Viral and other specified intestinal infectionsHeader
- A08.0Rotaviral enteritisBillable
- A08.1Acute gastroenteropathy due to Norwalk agent and other small round virusesHeader
- A08.11Acute gastroenteropathy due to Norwalk agentBillable
- A08.19Acute gastroenteropathy due to other small round virusesBillable
- A08.2Adenoviral enteritisBillable
- A08.3Other viral enteritisHeader
- A08.31Calicivirus enteritisBillable
- A08.32Astrovirus enteritisBillable
- A08.39Other viral enteritisBillable
- A08.4Viral intestinal infection, unspecifiedBillable
- A08.8Other specified intestinal infectionsBillable
Excludes1
Excludes1 means these codes are not reported together.
From A08. A note on a category applies to every code under it.
Related conditions
Related pages
- A08.4 code detailsNotes, nearby codes, CMS-HCC group
- Category A08Every code under it
- Chapter 1Certain infectious and parasitic diseases
- ICD-10 codes by conditionA to Z
- Check a list of ICD-10 codes
- Denial code CO-11Diagnosis does not support the procedure
- Denial code CO-146Diagnosis invalid for the date of service
- HCPCS Level II code lookup
Questions
What is the ICD-10 code for Stomach flu?
The CDC title for "Stomach flu" is A08 (Viral and other specified intestinal infections), a header that is not billable. When nothing more specific is documented, the billable code is A08.4, Viral intestinal infection, unspecified.
Is A08.4 billable?
Yes. A08.4 is a billable code in the FY2027 ICD-10-CM file. Use a more specific code when the record documents one.
What documentation notes apply to A08.4?
The CDC tabular list gives 1 Excludes1 note (not coded together) for A08.4 and the categories above it. They are listed on this page.
What chapter is A08.4 in?
Chapter 1. Certain infectious and parasitic diseases.
When do ICD-10-CM codes change?
Every October 1, with the new fiscal year file. Some years add April 1 updates. This page uses the FY2027 file, effective October 1, 2026.