A09 INFECTIOUS GASTROENTERITIS AND COLITIS, UNSPECIFIED

Code Information

  • Diagnosis Code: A09
  • Short Description: Infectious gastroenteritis and colitis, unspecified
  • Long Description: Infectious gastroenteritis and colitis, unspecified
  • Code Version: 2025 ICD-10-CM

The code A09 is VALID for claim submission

Code Classification

Synonyms

  • Acute erosive gastritis
  • Acute gastroenteritis
  • Acute gastroenteritis
  • Acute gastroenteritis
  • Acute gastroenteritis
  • Acute infectious nonbacterial gastroenteritis
  • Acute infective gastroenteritis
  • Acute ulcerative gastroenteritis complicating pneumonia
  • Aspergillosis enteritis of intestine
  • Aspergillosis enteritis of intestine
  • Aspergillus colitis
  • Blastomycotic enteritis of intestine
  • Catarrhal dysentery
  • Colitis presumed infectious
  • Colitis, enteritis and gastroenteritis presumed infectious
  • Diarrhea of presumed infectious origin
  • Disease caused by Heterocheiloidea
  • Disease of presumed infectious origin
  • Disease of presumed infectious origin
  • Disease of presumed infectious origin
  • Disease of presumed infectious origin
  • Disease of presumed infectious origin
  • Disorder of gastrointestinal tract co-occurrent with human immunodeficiency virus infection
  • Disorder of gastrointestinal tract co-occurrent with human immunodeficiency virus infection
  • Dysenteric diarrhea
  • Enteritis of intestine presumed infectious
  • Enteritis of small intestine presumed infectious
  • Epidemic diarrhea
  • Epidemic gastroenteritis
  • Erosive gastritis
  • Fungal colitis
  • Fungal colitis
  • Fungal duodenitis
  • Fungal gastrointestinal infection
  • Gastroenteritis presumed infectious
  • Gastrointestinal infection
  • Herpes simplex gastrointestinal tract infection
  • Infection by Anisakidae
  • Infection by Anisakis larva
  • Infection by Blastomyces dermatitidis
  • Infection of digestive system
  • Infection of intestine caused by Anisakis larva
  • Infection of large intestine
  • Infectious colitis
  • Infectious diarrheal disease
  • Infectious disease of digestive tract
  • Infectious enteritis of intestine
  • Infectious gastroenteritis
  • Infectious gastroenteritis co-occurrent with human immunodeficiency virus infection
  • Infectious gastroenteritis co-occurrent with human immunodeficiency virus infection
  • Infectious gastroenteritis with AIDS
  • Infective gastritis
  • Institution-acquired gastroenteritis
  • Institutional environment related disease
  • Intestinal infectious disease
  • Phlegmonous enteritis of gastrointestinal tract
  • Purulent enteritis
  • Secondary acquired megacolon
  • Suppurative gastritis
  • Toddler diarrhea
  • Toxic megacolon due to infectious colitis
  • Toxic state
  • Toxic state due to colonic dilatation

Diagnostic Related Group(s)

The code A09 is grouped in the following Diagnostic Related Group(s) MS-DRG V43.0

  1. Esophagitis, Gastroenteritis And Miscellaneous Digestive Disorders With Mcc (391)
  2. Esophagitis, Gastroenteritis And Miscellaneous Digestive Disorders Without Mcc (392)

References to Index of Diseases and Injuries

The code A09 has the following ICD-10-CM references to the Index of Diseases and Injuries

  • Inclusion Terms:
    • Infectious colitis NOS
    • Infectious enteritis NOS
    • Infectious gastroenteritis NOS
  • Type 1 Excludes Notes:
    • colitis NOS (@K52.9*)
    • diarrhea NOS (@R19.7*)
    • enteritis NOS (@K52.9*)
    • gastroenteritis NOS (@K52.9*)
    • noninfective gastroenteritis and colitis, unspecified (@K52.9*)

Crosswalk Information

ICD-10 Code ICD-9 Code ICD-9 Description
A09 Right Arrow 009.0 Infectious enteritis NOS
This ICD-10 to ICD-9 data is based on the 2018 General Equivalency Mapping (GEM) files published by the Centers for Medicare & Medicaid Services (CMS) for informational purposes only. The data is not an ICD-10 conversion tool and doesn’t guarantee clinical accuracy.

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ICD-10 Code ICD-10 Description
This page was last updated on: 10/1/2025
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