Intestinal infectious diseases (A00-A09)

ICD-10 codes A00-A09 cover a range of intestinal infectious diseases caused by various bacteria, protozoa, and viruses that affect the digestive system. These codes are used for diagnosing conditions such as cholera, typhoid, salmonella infections, shigellosis, amebiasis, and several viral gastroenteritis types.

This code range includes Cholera (A00) caused by different Vibrio cholerae biovars, identified using synonyms like intestinal infection caused by Vibrio cholerae. It also categorizes typhoid and paratyphoid fevers (A01), with specific forms such as typhoid fever with meningitis or pneumonia. The salmonella infections (A02) include salmonella enteritis, localized infections, and sepsis, with terms like Salmonella gastroenteritis helping to clarify the coding. Shigellosis (A03) is detailed by the type of Shigella bacteria causing colitis, often referenced as bacterial dysentery. Other bacterial intestinal infections (A04) cover various Escherichia coli and Clostridium difficile infections, including recurrent forms, commonly called Clostridioides difficile infection or traveler’s diarrhea for certain E. coli types. Amebiasis (A06) codes describe protozoal infections like acute and chronic amebic dysentery and related abscesses, with synonyms such as Entamoeba histolytica infection. Additional protozoal diseases (A07), including giardiasis and cryptosporidiosis, and viral intestinal infections (A08), such as rotaviral enteritis and Norwalk virus, further define this chapter. The unspecified category (A09) is used for infectious gastroenteritis and colitis of undetermined cause.