A09 ICD-10-CA category: Other gastroenteritis and colitis of infectious and unspecified origin
A09 isn’t a code on its own. Choose one of the 2 codes beneath it, the one the documentation supports.
Official description
A09Other gastroenteritis and colitis of infectious and unspecified origin
ICD-10-CA · Canada
Codes in A09
A09 isn’t a code on its own. Open the code that matches what the note documents.
Notes for A09
As CIHI prints them, with any note A09 takes from the headings above it.
Includes
- Diseases generally recognized as communicable or transmissibleFrom Chapter 1: Certain infectious and parasitic diseases (A00-B99)
Use additional code
Add a code for this detail when the note documents it.
- Use additional code (U82-U84) to identify resistance to antimicrobial drugsFrom Chapter 1: Certain infectious and parasitic diseases (A00-B99)
Excludes
Conditions classified elsewhere.
- Due to bacterial, protozoal, viral and other specified infectious agents (A00-A08)noninfective (see noninfectious) diarrhoea (K52.9):• neonatal (P78.3)
- Carrier or suspected carrier of infectious disease (Z22.-)certain localized infections - see body system-related chaptersinfectious and parasitic diseases:• complicating pregnancy, childbirth and the puerperium [except obstetrical tetanus] (O98.-)• specific to the perinatal period [except tetanus neonatorum, whooping cough, congenital syphilis, perinatal gonococcal infection and perinatal human immunodeficiency virus [HIV] disease] (P35-P39)influenza and other acute respiratory infections (J00-J22)From Chapter 1: Certain infectious and parasitic diseases (A00-B99)
Where A09 sits
- 1ChapterChapter 1: Certain infectious and parasitic diseases (A00-B99)
- 2Block A00-A09Intestinal infectious diseases
- 3Category A09Other gastroenteritis and colitis of infectious and unspecified origin
Source and release
- Data release
- ICD-10-CA · FY 2026–2027
- Effective date
- Apr 1, 2026
- Publisher
- CIHI
This page is built from the ICD-10-CA catalog that Vero Codes reads when it suggests codes: Canadian Institute for Health Information’s FY 2026–2027 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.
Frequently asked questions
Is A09 a valid ICD-10-CA code?
No. A09 (Other gastroenteritis and colitis of infectious and unspecified origin) is a category heading in CIHI’s ICD-10-CA FY 2026–2027 release. It holds 2 codes; record the one the documentation supports.
Where is A09 in ICD-10-CA?
A09 sits under A00-A09 Intestinal infectious diseases, within Chapter 1: Certain infectious and parasitic diseases (A00-B99).
What coding notes apply to A09?
ICD-10-CA lists Excludes, Includes, Use additional code notes for A09, including those from the headings it sits under. They are listed on this page with where each one comes from.
Which ICD-10-CA release does this page use?
It uses CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026 to Mar 31, 2027. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.