Acute gastroenteropathy due to Norwalk agent

This code signifies an acute inflammation of the stomach and intestines specifically caused by the Norwalk virus, a common type of norovirus. It presents with sudden onset of vomiting, diarrhea, and abdominal cramps.

Apply this code when documentation clearly states an acute gastroenteritis attributed to the Norwalk agent or norovirus. This diagnosis is typically supported by clinical presentation and, if performed, positive laboratory identification of norovirus.

• Ensure the documentation explicitly names "Norwalk agent" or "norovirus" as the causative organism.
• Do not use this code for gastroenteritis due to other viral agents or unspecified viral gastroenteritis.
• Consider sequencing this code as the primary diagnosis if it is the reason for the encounter.