ICD-10 A08.11
Billable / Specific CCAcute gastroenteropathy due to Norwalk agent
About ICD-10-CM A08.11
ICD-10-CM code A08.11 represents Acute gastroenteropathy due to Norwalk agent. This is a billable/specific code in the Infectious and Parasitic Diseases chapter (block A08). The 2026 edition of ICD-10-CM A08.11 became effective on October 1, 2025.
Coding Tips for A08.11
Specialist guidance from the PayerReady Medical Coding Team. Specificity warnings, HCC capture rules, sequencing notes.
A08.11 is designated CC for MS-DRG grouping. On inpatient claims, this code can shift the DRG to the with-CC variant when documented as a present-on-admission secondary diagnosis. Hospital CDI programs flag CC opportunities during chart review. Failure to capture this code may leave 30 to 80 percent of the inpatient stay revenue unrealized.
Inclusion Terms / Approximate Synonyms
Clinical terms and conditions classified under A08.11. Per CMS ICD-10-CM Tabular 2026.
- Acute gastroenteropathy due to Norovirus
- Acute gastroenteropathy due to Norwalk-like agent
Inpatient DRG Impact, CC
codes Acute gastroenteropathy due to Norwalk agent. As a Complication/Comorbidity (CC), this contributes to DRG severity adjustment when documented alongside the principal diagnosis.
Medicare LCD Coverage for A08.11
Local Coverage Determinations (LCDs) from CMS MACs that list A08.11 as a covered diagnosis.
Showing top 10 of 638 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing A08.11.
5 Medicare
CPT Codes Commonly Billed with A08.11
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
- 87482 CMS LCD: Billing and Coding: MolDX: Molecular Syndromic Panels for Infectious Disease Pathogen Identification Testing CMS LCD
- 0429U CMS LCD: Billing and Coding: MolDX: Molecular Syndromic Panels for Infectious Disease Pathogen Identification Testing CMS LCD
- 87557 CMS LCD: Billing and Coding: MolDX: Molecular Syndromic Panels for Infectious Disease Pathogen Identification Testing CMS LCD
- 87593 CMS LCD: Billing and Coding: MolDX: Molecular Syndromic Panels for Infectious Disease Pathogen Identification Testing CMS LCD
- 0068U CMS LCD: Billing and Coding: MolDX: Molecular Syndromic Panels for Infectious Disease Pathogen Identification Testing CMS LCD
- 87651 CMS LCD: Billing and Coding: MolDX: Molecular Syndromic Panels for Infectious Disease Pathogen Identification Testing CMS LCD
- 87487 CMS LCD: Billing and Coding: MolDX: Molecular Syndromic Panels for Infectious Disease Pathogen Identification Testing CMS LCD
- 87538 CMS LCD: Billing and Coding: MolDX: Molecular Syndromic Panels for Infectious Disease Pathogen Identification Testing CMS LCD
- 87563 CMS LCD: Billing and Coding: MolDX: Molecular Syndromic Panels for Infectious Disease Pathogen Identification Testing CMS LCD
- 87582 CMS LCD: Billing and Coding: MolDX: Molecular Syndromic Panels for Infectious Disease Pathogen Identification Testing CMS LCD
Convert A08.11 to ICD-9-CM
Per CMS General Equivalence Mappings (GEMs), useful for legacy data review and historical claim analysis.
| ICD-10 | ICD-9 | Mapping Flags |
|---|---|---|
| A08.11 | 00863 | 10000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To A08.11
Other codes in section A00-A09 (Intestinal infectious diseases).
ICD-10 A08.11, Billing FAQ
Is ICD-10 code A08.11 billable? +
Yes, A08.11 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
What other names or terms map to A08.11? +
ICD-10 A08.11 includes: Acute gastroenteropathy due to Norovirus; Acute gastroenteropathy due to Norwalk-like agent.
Is A08.11 a CC or MCC for inpatient DRG? +
Yes, this code is designated as CC. Documenting as a secondary diagnosis on inpatient claims can shift the DRG to a higher-weighted category.
What CPT codes are commonly billed with A08.11? +
Procedures frequently paired with A08.11 include: 87482, 0429U, 87557, 87593, 0068U.
What ICD-9 codes does A08.11 map to? +
Per CMS GEMs, A08.11 maps to ICD-9 codes: 00863. Useful for legacy data review and historical claim analysis.
Get the full PayerReady toolkit
Free access to CPT/ICD-10 lookup, denial appeals, fee comparator, and claim auditing with credentialing enrollment.
Start free →Run this code through our claim audit tool
Check NCCI bundling, MUE limits, and modifier logic before submission.
Try the auditor →Did this page help?
Quick signal so we know what to improve.
If you want a code reference page that doesn't exist yet, email coding@payerready.com.
Tell us what's missing or wrong: coding@payerready.com. We respond within 5 business days.
Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on May 31, 2026.
Powered by 11K CPT · 98K ICD-10 · 860K MPFS rates · 4.5M NCCI edits · 9.5M NPIs. Our data methodology · About our coding team