2027 ICD-10-CM Diagnosis Code A08Viral and other specified intestinal infections

ICD-10-CM Codes›A00–B99›A00-A09›A08

ICD-10-CM A08
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

A08 is a non-billable ICD-10-CM category code for viral and other specified intestinal infections, so it cannot be submitted on claims. Use a more specific code from this category instead, such as A08.0, A08.11, A08.19, and A08.2.

Code Identity

ICD-10-CM Code
A08
Billable Status
No — Non-Billable Category
Code Describes
Viral and other specified intestinal infections
Short Description
Viral and other specified intestinal infections
Same as the full description in the CMS dataset.
Chapter
A00-A09
Intestinal infectious diseases

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionA00-A09Intestinal infectious diseases
CategoryA08Viral and other specified intestinal infections
This CodeA08Viral and other specified intestinal infections

Specific Coding for Viral and other specified intestinal infectionsOverview

Non-specific codes like A08 require more characters. Use one of these billable codes instead:

  • Use A08.0 for Rotaviral enteritis

  • A08.1 for Acute gastroenteropathy due to Norwalk agent and other small round viruses

  • Use A08.11 for Acute gastroenteropathy due to Norwalk agent

  • Use A08.19 for Acute gastroenteropathy due to other small round viruses

  • Use A08.2 for Adenoviral enteritis

  • A08.3 for Other viral enteritis

  • Use A08.31 for Calicivirus enteritis

  • Use A08.32 for Astrovirus enteritis

  • Use A08.39 for Other viral enteritis

  • Use A08.4 for Viral intestinal infection, unspecified

  • Use A08.8 for Other specified intestinal infections

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to A08: its own notes plus those printed at Chapter 1. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • diseases generally recognized as communicable or transmissible

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • carrier or suspected carrier of infectious disease (Z22.-)
  • certain localized infections - see body system-related chapters
  • infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
  • infectious and parasitic diseases specific to the perinatal period (P35-P39)
  • influenza and other acute respiratory infections (J00-J22)

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • code to identify resistance to antimicrobial drugs (Z16.-)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name A08, its category, or a range that includes it.

Excludes1 3

These codes carry an Excludes1 note naming A08: they are not reported together with it, unless the two conditions are unrelated.

  • J09.X3 Influenza due to identified novel influenza A virus with gastrointestinal manifestations
    'intestinal flu' [viral gastroenteritis] (A08.-)
  • J10.2 Influenza due to other identified influenza virus with gastrointestinal manifestations
    'intestinal flu' [viral gastroenteritis] (A08.-)
  • J11.2 Influenza due to unidentified influenza virus with gastrointestinal manifestations
    'intestinal flu' [viral gastroenteritis] (A08.-)

Excludes2 2

These codes carry an Excludes2 note naming A08: its condition is not part of those codes, and both may be reported when the patient has both.

  • Block P35-P39 Infections specific to the perinatal period
    intestinal infectious disease (A00-A09) names A00-A09, which includes this code
  • P37 Other congenital infectious and parasitic diseases
    infectious neonatal diarrhea (A00-A09) names A00-A09, which includes this code

Patient EducationClinical

Gastroenteritis

Gastroenteritis is an inflammation of the lining of the stomach and intestines. The main symptoms include vomiting and diarrhea. It is usually not serious in healthy people, but it can sometimes lead to dehydration or cause severe symptoms.

The full article covers:

  • What is gastroenteritis?
  • What causes gastroenteritis?
  • What are the symptoms of gastroenteritis?
  • How is gastroenteritis diagnosed?
  • What are the treatments for gastroenteritis?
  • Can gastroenteritis be prevented?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About A08Overview

What is the ICD-10 code for viral and other specified intestinal infections?

A08 is the ICD-10-CM category for viral and other specified intestinal infections, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

Is A08 (Viral and other specified intestinal infections) a billable code?

No. This is a category header that groups the codes for viral and other specified intestinal infections, and headers cannot be submitted on claims. Claims for viral and other specified intestinal infections need a more specific code from this category, such as A08.0, A08.11, and A08.19.

Can A08 be reported with J09.X3?

Not as a rule. The Excludes1 note on A08 lists "influenza with involvement of gastrointestinal tract (J09.X3, J10.2, J11.2)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).