Acute Gastroenteritis ICD-10-CM Codes

Acute Gastroenteritis ICD-10-CM Codes

By Ashleigh Knowles on Jul 15, 2025.

What ICD-10 Codes are Used for Acute Gastroenteritis 

Here's a list of the three Acute Gastroenteritis ICD Codes commonly used for billing and coding:

  • A08.11: Acute gastro enteropathy due to Norwalk agent

Norwalk agent refers to noroviruses, a group of viruses known for causing acute gastroenteritis. 

  • A08.19: Acute gastro enteropathy due to other small round viruses

Though the Norwalk agent is a small round virus, one can only use this code for other similarly shaped viruses that aren't the Novovirus, like the calicivirus.

  • K52.9: Noninfective gastroenteritis and colitis, unspecified

According to the synonyms, practitioners can use this code if noninfective organisms cause acute gastroenteritis. 

Do note that a patient may still have acute gastroenteritis. However, it’s caused by other viruses. If so, please refer to the other specific ICD codes under A08: Viral and other specified intestinal infections.  

Which Acute Gastroenteritis ICD codes are Billable: 

All the specific codes mentioned above are billable.

Clinical Information

  • Gastroenteritis is a common and highly infectious condition that affects one's stomach and intestines. 
  • Symptoms of gastroenteritis are diarrhea, vomiting, nausea, cramping, and abdominal pain. If a patient has acute gastroenteritis, they will experience the symptoms for at most 14 days.
  • Viruses like the Novovirus, Rotavirus, and Astrovirus are among the leading causes of acute gastroenteritis. Although certain bacteria, parasites,  medications, and toxins can cause acute gastroenteritis as well.
  • Two common types of acute gastroenteritis are Traveler's diarrhea and foodborne Acute Gastroenteritis.
  • To diagnose this condition, a practitioner will ask the patient about their symptoms and do a physical exam. If their condition worsens even after treatment, they will be asked to undergo a stool test.
  • Treatment is usually waiting and fluids and, in severe cases, antibiotics.

Synonyms Include:

  • Viral gastroenteritis due to Norwalk-like agent
  • Infection caused by Norovirus
  • Enteritis due to Norovirus
  • Disease due to Calicivirus
  • Calicivirus Gastroenteritis 
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