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A08.11

A08.11: Acute gastroenteropathy due to Norwalk agent

Billable / specific codeICD-10-CM

A08.11 is a billable, specific ICD-10-CM code for acute gastroenteropathy due to norwalk agent. It is valid for submission on a claim.

Check A08.11 with the rest of the claim: free scrubber

Inclusion terms

Alternative wordings a physician may use in the chart for this same code.

  • Acute gastroenteropathy due to Norovirus
  • Acute gastroenteropathy due to Norwalk-like agent

Excludes1 inherited from the categories above A08.11

A category’s note binds every code beneath it.

Written on A08: Viral and other specified intestinal infections

Other codes that can never be billed with A08.11

Their own Excludes1 notes name this code, so the conflict is not listed above.

  • J09.X3Influenza due to identified novel influenza A virus with gastrointestinal manifestations
  • J10.2Influenza due to other identified influenza virus with gastrointestinal manifestations
  • J11.2Influenza due to unidentified influenza virus with gastrointestinal manifestations

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Medicare coverage

A08.11 is named in 7 Medicare coverage policies: 7 listing it as supporting medical necessity. Which one applies depends on your Medicare contractor.

  • A56456Billing and Coding: Colonoscopy/Sigmoidoscopy/Proctosigmoidoscopy
  • A56632Billing and Coding: Colonoscopy/Sigmoidoscopy/Proctosigmoidoscopy
  • A58710Billing and Coding: MolDX: Molecular Syndromic Panels for Infectious Disease Pathogen Identification Testing
  • A58720Billing and Coding: MolDX: Molecular Syndromic Panels for Infectious Disease Pathogen Identification Testing

Alphabetic index entries that lead here

  • Enteritis›norovirus
  • Gastroenteropathy›acute, due to Norovirus
  • Gastroenteropathy›acute, due to Norwalk agent
  • Gastroenteritis›viral NEC›Norwalk agent
  • Gastroenteritis›viral NEC›acute infectious›type Norwalk

Code history

Unchanged in every release from FY2024 to FY2027.

Other codes under A08.1

ICD-10-CMFY2027· effective October 1, 2026

Loaded directly from the CMS/NCHS ICD-10-CM public-domain release: see data sources and our editorial policy. If this page disagrees with the CMS tabular list, this page is wrong. Reference information for professional coders; not medical or billing advice.