A09.9: Gastroenteritis and colitis of unspecified origin

Gastroenteritis and colitis of unspecified origin, as identified by the ICD-10 code A09.9, refer to inflammation of the gastrointestinal tract, specifically the stomach and intestines, and colon, respectively, with unknown cause. This condition typically results in symptoms such as diarrhea, abdominal pain, vomiting, and sometimes fever. It may come on suddenly, indicating acute gastroenteritis or colitis, or persist for a long time, indicating a chronic condition. The inflammation is often caused by an infection, although it may also be the result of other factors. Despite the unspecified origin, patients typically acquire this condition through the consumption of contaminated food or water, close contact with an infected person, or the use of unclean hands to prepare and consume food.