ICD-10-CM 2027 diagnosis code
A08.1Acute gastroenteropathy due to Norwalk agent and other small round viruses
A08.1 is a header code, so it can't be reported by itself. Choose one of the 2 more specific codes beneath it.Short description: Acute gastrent d/t Norwalk agent and oth small round viruses
Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About A08.1
A08.1 is the ICD-10-CM diagnosis code for acute gastroenteropathy due to Norwalk agent and other small round viruses. It belongs to category A08 (viral and other specified intestinal infections), block A00-A09 (intestinal infectious diseases) and chapter 1 (certain infectious and parasitic diseases). It is a header code, so it can't be reported by itself; one of its 2 subcodes must be used instead.
Within A08, choose A08.1 (Acute gastroenteropathy due to Norwalk agent and other small round viruses) only when documentation doesn't support a more specific option: Rotaviral enteritis (A08.0), adenoviral enteritis (A08.2), other viral enteritis (A08.3), viral intestinal infection, unspecified (A08.4) and other specified intestinal infections (A08.8).
To report this condition, pick the subcode that matches the documentation: A08.11 (agent) and A08.19 (viruses).
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Specific codes under A08.1
Notes that apply from higher levels
Instructions written at a parent level also apply to A08.1.
Broader instructions also apply from Chapter 1: Certain infectious and parasitic diseases.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about A08.1
Is A08.1 billable?
- No. A08.1 is a header code. Report one of its more specific subcodes instead.