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

ICD-10-CM 2027 diagnosis code · Intestinal infectious diseases

Non-billable header

ICD-10-CM code A08.1

Code: A08.1 (claims format: A081)
Description: Acute gastroenteropathy due to Norwalk agent and other small round viruses
Short description: Acute gastrent d/t Norwalk agent and oth small round viruses
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 1. Certain infectious and parasitic diseases (A00-B99)
Block: A00-A09 Intestinal infectious diseases
Parent codes: A08

Billable codes under A08.1

A08.1 is a header code and cannot be used on claims. Choose the most specific code:

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

A08 – Viral and other specified intestinal infections

Excludes1 (not coded here):

influenza with involvement of gastrointestinal tract (J09.X3, J10.2, J11.2)

Related codes in A08

A08.0 – Rotaviral enteritisBillable
A08.2 – Adenoviral enteritisBillable
A08.3 – Other viral enteritisHeader
A08.4 – Viral intestinal infection, unspecifiedBillable
A08.8 – Other specified intestinal infectionsBillable

Frequently asked questions

What is ICD-10 code A08.1?

A08.1 is the ICD-10-CM code for acute gastroenteropathy due to Norwalk agent and other small round viruses, in the block A00-A09 (Intestinal infectious diseases).

Is A08.1 a billable code?

No. A08.1 is a header code with more specific child codes; report one of the billable codes listed above.

What category does A08.1 belong to?

It belongs to category A08 – Viral and other specified intestinal infections.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.