ICD-10 Diagnosis Code A09

Infectious gastroenteritis and colitis, unspecified

Diagnosis Code A09

ICD-10: A09
Short Description: Infectious gastroenteritis and colitis, unspecified
Long Description: Infectious gastroenteritis and colitis, unspecified
This is the 2017 version of the ICD-10-CM diagnosis code A09

Code Classification
  • Certain infectious and parasitic diseases
    • Intestinal infectious diseases (A00-A09)
      • Infectious gastroenteritis and colitis, unspecified (A09)

Information for Medical Professionals

Diagnostic Related Groups
The diagnosis code A09 is grouped in the following Diagnostic Related Group(s) (MS-DRG v33.0)


Convert to ICD-9 Additional informationCallout TooltipGeneral Equivalence Map
The ICD-10 and ICD-9 GEMs are used to facilitate linking between the diagnosis codes in ICD-9-CM and the new ICD-10-CM code set. The GEMs are the raw material from which providers, health information vendors and payers can derive specific applied mappings to meet their needs.

  • Acute erosive gastritis
  • Acute gastritis
  • Acute gastritis
  • Acute gastritis
  • Acute gastroenteritis
  • Acute gastroenteritis
  • Acute gastroenteritis
  • Acute infectious nonbacterial gastroenteritis
  • Acute infective gastroenteritis
  • Acute ulcerative gastroenteritis complicating pneumonia
  • Catarrhal dysentery
  • Colitis presumed infectious
  • Colitis, enteritis and gastroenteritis presumed infectious
  • Diarrhea of presumed infectious origin
  • Dysenteric diarrhea
  • Dysentery
  • Enteritis presumed infectious
  • Epidemic diarrhea
  • Epidemic gastroenteritis
  • Erosive gastritis
  • Fungal gastrointestinal infection
  • Gastroenteritis presumed infectious
  • Hemorrhagic dysentery
  • Ill-defined infectious disease
  • Ill-defined infectious disease
  • Ill-defined intestinal infection
  • Ill-defined intestinal infection
  • Ill-defined intestinal infection associated with acquired immunodeficiency syndrome
  • Infectious colitis
  • Infectious colitis, enteritis and gastroenteritis
  • Infectious diarrheal disease
  • Infectious disease of digestive tract
  • Infectious enteritis
  • Infectious gastroenteritis
  • Infectious gastroenteritis associated with acquired immunodeficiency syndrome
  • Infective gastritis
  • Inflammatory diarrhea
  • Institution-acquired gastroenteritis
  • Intestinal infectious disease
  • Phlegmonous enteritis
  • Purulent enteritis
  • Septic enteritis
  • Specific gastrointestinal infectious disease
  • Suppurative gastritis
  • Toddler diarrhea
  • Viral and ill-defined gastrointestinal infections

Index of Diseases and Injuries
References found for the code A09 in the Index of Diseases and Injuries:

Information for Patients


Also called: Stomach flu

Have you ever had the "stomach flu?" What you probably had was gastroenteritis - not a type of flu at all. Gastroenteritis is an inflammation of the lining of the intestines caused by a virus, bacteria or parasites. Viral gastroenteritis is the second most common illness in the U.S. The cause is often a norovirus infection. It spreads through contaminated food or water, and contact with an infected person. The best prevention is frequent hand washing.

Symptoms of gastroenteritis include diarrhea, abdominal pain, vomiting, headache, fever and chills. Most people recover with no treatment.

The most common problem with gastroenteritis is dehydration. This happens if you do not drink enough fluids to replace what you lose through vomiting and diarrhea. Dehydration is most common in babies, young children, the elderly and people with weak immune systems.

NIH: National Institute of Diabetes and Digestive and Kidney Diseases

  • Bacterial gastroenteritis
  • Bland diet
  • CMV - gastroenteritis/colitis
  • Stool Gram stain
  • Viral gastroenteritis
  • When you have nausea and vomiting
  • When you or your child has diarrhea

[Read More]

Infectious Diseases

Also called: Communicable diseases

Infectious diseases kill more people worldwide than any other single cause. Infectious diseases are caused by germs. Germs are tiny living things that are found everywhere - in air, soil and water. You can get infected by touching, eating, drinking or breathing something that contains a germ. Germs can also spread through animal and insect bites, kissing and sexual contact. Vaccines, proper hand washing and medicines can help prevent infections.

There are four main kinds of germs:

  • Bacteria - one-celled germs that multiply quickly and may release chemicals which can make you sick
  • Viruses - capsules that contain genetic material, and use your own cells to multiply
  • Fungi - primitive plants, like mushrooms or mildew
  • Protozoa - one-celled animals that use other living things for food and a place to live

NIH: National Institute of Allergy and Infectious Diseases

[Read More]
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