A09

Billable

Infectious gastroenteritis and colitis, unspecified

A09 is the ICD-10-CM code for Infectious gastroenteritis and colitis, unspecified. It is a billable, specific code valid for reimbursement.

Status
Billable
Chapter
A00-B99
Edition
FY2026

A00-B99 Certain infectious and parasitic diseases

What this means — in plain language

MedlinePlus · NIH

What is gastroenteritis? Gastroenteritis is an inflammation of the lining of the stomach and intestines. The main symptoms include vomiting and diarrhea . It is usually not serious in healthy people, but it can sometimes lead to dehydration or cause severe symptoms. What causes gastroenteritis? There can be many different causes of gastroenteritis: Viruses Bacteria Parasites Chemicals Reactions to certain medicines…

Read more about Gastroenteritis at MedlinePlus ↗

Source: U.S. National Library of Medicine (MedlinePlus). Informational only — not medical advice.

Includes

  • Infectious colitis NOS
  • Infectious enteritis NOS
  • Infectious gastroenteritis NOS

Excludes1 — not coded here

  • colitis NOS (K52.9)
  • diarrhea NOS (R19.7)
  • enteritis NOS (K52.9)
  • gastroenteritis NOS (K52.9)
  • noninfective gastroenteritis and colitis, unspecified (K52.9)

Frequently asked questions

What is ICD-10 code A09?
A09 is the ICD-10-CM code for "Infectious gastroenteritis and colitis, unspecified". It falls under A00-B99 Certain infectious and parasitic diseases.
Is A09 a billable code?
Yes — A09 is a billable, specific ICD-10-CM code valid for reimbursement.
What is excluded from A09?
Excludes1 (not coded here): colitis NOS (K52.9); diarrhea NOS (R19.7); enteritis NOS (K52.9); gastroenteritis NOS (K52.9).

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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