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A09.0 ICD-10-CA code: Other and unspecified gastroenteritis and colitis of infectious origin

A09.0 is the ICD-10-CA code for “Other and unspecified gastroenteritis and colitis of infectious origin” in CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026.

Official description

A09.0

Other and unspecified gastroenteritis and colitis of infectious origin

Short description: Oth & unsp gastroe & colitis inf origin

ICD-10-CA · Canada · Also written A090

Index terms

Entries in CIHI’s alphabetical index that lead to A09.0. Searching the index by the condition the note names is how coders reach this code.

  • Ileitis, infectious
  • Jejunitis, infectious
  • Ileocolitis, infectious
  • Sigmoiditis, infectious
  • Enterocolitis, infectious NEC
  • Gastroenteropathy, infectious
  • Gastroenteritis (acute), septic
  • Gastroenteritis (acute), epidemic
  • Gastroenteritis (acute), infectious
  • Infection, infected (opportunistic), colon
  • Enteritis (diarrheal) (hemorrhagic), septic
  • Disease, diseased, diarrheal, infectious NEC
  • Infection, infected (opportunistic), enteric
  • Enteritis (diarrheal) (hemorrhagic), epidemic
  • Enteritis (diarrheal) (hemorrhagic), gangrenous
  • Colitis (acute) (catarrhal) (hemorrhagic), septic
  • Diarrhea, diarrheal (disease) (infantile), endemic
  • Enteritis (diarrheal) (hemorrhagic), acute, bloody
  • Diarrhea, diarrheal (disease) (infantile), epidemic
  • Enteritis (diarrheal) (hemorrhagic), infectious NEC
  • Colitis (acute) (catarrhal) (hemorrhagic), infectious
  • Diarrhea, diarrheal (disease) (infantile), dysenteric
  • Diarrhea, diarrheal (disease) (infantile), infectious
  • Infection, infected (opportunistic), gastrointestinal
  • Enteritis (diarrheal) (hemorrhagic), acute, hemorrhagic
  • Diarrhea, diarrheal (disease) (infantile), acute, bloody
  • Diarrhea, diarrheal (disease) (infantile), acute, watery
  • Infection, infected (opportunistic), alimentary canal NEC
  • Infection, infected (opportunistic), intestine, intestinal
  • Diarrhea, diarrheal (disease) (infantile), acute, hemorrhagic
  • Diarrhea, diarrheal (disease) (infantile), inflammatory, infectious
  • Diarrhea, diarrheal (disease) (infantile), neonatal NEC, infectious
  • Inflammation, inflamed, inflammatory (with exudation), ileum, infectious
  • Dysentery, dysenteric (catarrhal) (diarrhea) (epidemic) (hemorrhagic) (infectious) (sporadic) (tropical)
  • Condition, conditions (arising in the perinatal period), diarrhea, diarrheal (disease) (endemic) (infantile) (presumed infectious) (summer), neonatal NEC, infectious

Notes for A09.0

As CIHI prints them, with any note A09.0 takes from the headings above it.

Includes

  • Catarrh, enteric or intestinalDiarrhoea:• acute bloody• acute hemorrhagic• acute watery• dysenteric• epidemicInfectious or septic: colitis, enteritis, gastroenteritis — NOS, haemorrhagicInfectious (neonatal) diarrhoea NOS
  • 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)From A09 Other gastroenteritis and colitis of infectious and unspecified origin
  • 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 A09.0 sits

  1. 1ChapterChapter 1: Certain infectious and parasitic diseases (A00-B99)
  2. 2Block A00-A09Intestinal infectious diseases
  3. 3Category A09Other gastroenteritis and colitis of infectious and unspecified origin
  4. 4Valid code A09.0Other and unspecified gastroenteritis and colitis of infectious 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.

See A09.0 in the CIHI source

Frequently asked questions

What does ICD-10-CA code A09.0 mean?

A09.0 is the ICD-10-CA code for “Other and unspecified gastroenteritis and colitis of infectious origin” in CIHI’s ICD-10-CA FY 2026–2027 release.

Where is A09.0 in ICD-10-CA?

A09.0 sits under A09 Other gastroenteritis and colitis of infectious and unspecified origin, within A00-A09 Intestinal infectious diseases, within Chapter 1: Certain infectious and parasitic diseases (A00-B99).

What coding notes apply to A09.0?

ICD-10-CA lists Includes, Excludes, Use additional code notes for A09.0, 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.

Codes beside A09.0

A09.9Gastroenteritis and colitis of unspecified origin