A09
✓ Billable
Infectious gastroenteritis and colitis, unspecified
ICD-10-CM · FY2026 · Certain Infectious and Parasitic Diseases
Code
A09
System
ICD-10-CM
Billable
Yes — valid for submission
Effective
FY2026
Chapter
Certain Infectious and Parasitic Diseases
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Official coding notes
From CMS's ICD-10-CM Tabular List.
Also known as
- Infectious colitis NOS
- Infectious enteritis NOS
- Infectious gastroenteritis NOS
Excludes1 — never code together
- 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?
ICD-10-CM code A09 represents Infectious gastroenteritis and colitis, unspecified. It is a billable diagnosis code in the Certain Infectious and Parasitic Diseases chapter, effective October 1, 2025 – September 30, 2026.
Is A09 billable?
Yes. A09 is a valid billable ICD-10-CM code for insurance claims and clinical documentation.
What chapter is A09 in?
A09 belongs to the Certain Infectious and Parasitic Diseases chapter (A00–B99) of ICD-10-CM.
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