Viral and other specified intestinal infections (A08) ICD-10-CM
The A08 code range covers viral and other specified intestinal infections with 12 ICD-10-CM diagnosis codes. 9 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Codes in the A08 Range 12 codes · 9 billable
- A08 Viral and other specified intestinal infectionsNon-billable
- A08.0 Rotaviral enteritis
- A08.1 Acute gastroenteropathy due to Norwalk agent and other small round virusesNon-billable
- A08.11 Acute gastroenteropathy due to Norwalk agent
- A08.19 Acute gastroenteropathy due to other small round viruses
- A08.2 Adenoviral enteritis
- A08.3 Other viral enteritisNon-billable
- A08.31 Calicivirus enteritis
- A08.32 Astrovirus enteritis
- A08.39 Other viral enteritis
- A08.4 Viral intestinal infection, unspecified
- A08.8 Other specified intestinal infections
About the A08 Code Range
The ICD-10 code A08 covers viral and other specified intestinal infections, identifying illnesses caused primarily by various viruses affecting the intestines. These codes help specify the exact virus responsible for conditions like viral gastroenteritis, which is inflammation of the stomach and intestines due to a viral infection.
This section includes detailed codes such as A08.0 for rotaviral enteritis, a common cause of diarrhea in children known as rotavirus infection or viral food poisoning. The code A08.11 specifies acute gastroenteropathy due to the Norwalk agent, also called Norovirus infection or epidemic vomiting syndrome. Other viruses coded here include adenoviruses (A08.2) and astroviruses (A08.32). The category also includes A08.39 for other viral enteritis like herpes simplex or enterovirus infections. Additionally, A08.8 captures intestinal infections caused by fungi or rare organisms such as aspergillosis and blastomycosis. These ICD-10 codes help healthcare providers accurately document and differentiate between viral intestinal infections, guiding treatment and epidemiological tracking.
Questions About This Page
How many billable codes are in the A08 range?
Of the 12 codes in this range, 9 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the A08 range classify?
The range classifies viral and other specified intestinal infections. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
