A09
ICD-10BillableInfectious gastroenteritis and colitis, unspecified
Official ICD-10-CM descriptor (FY2026)
Infectious gastroenteritis and colitis, unspecified
A09 is valid for submission on a claim: CMS flags it as a billable, specific code.
Inclusion terms
- Infectious colitis NOS
- Infectious enteritis NOS
- Infectious gastroenteritis NOS
Excludes1
Not coded here. An Excludes1 code should never be reported at the same time as the code above it.
- colitis NOS (K52.9)
- diarrhea NOS (R19.7)
- enteritis NOS (K52.9)
- gastroenteritis NOS (K52.9)
- noninfective gastroenteritis and colitis, unspecified (K52.9)
Where this code sits
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ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.