Intestinal infectious diseases (A00-A09)
chapter 1: Certain Infectious and Parasitic Diseases
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Official coding guidelines
From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.
Rules for coding infections and parasitic diseases, including HIV, organism and drug resistance codes, sepsis and septic shock, MRSA, Zika, and COVID-19.
- Human Immunodeficiency Virus (HIV) Infections (page 19)
- Infectious agents as the cause of diseases classified to other chapters (page 22)
- Infections resistant to antibiotics (page 22)
- Sepsis, Severe Sepsis, and Septic Shock (page 23)
- Methicillin Resistant Staphylococcus aureus (MRSA) Conditions (page 27)
- Zika virus infections (page 28)
- Coronavirus infections (page 28)
All codes under A00-A09
A00-A09 can't be used on a claim. Pick a billable code below; grey headings group them.
- A00Cholera
- A00.0Cholera due to Vibrio cholerae 01, biovar cholerae
- A00.1Cholera due to Vibrio cholerae 01, biovar eltor
- A00.9Cholera, unspecified
- A01Typhoid and paratyphoid fevers
- A01.0Typhoid fever
- A01.00Typhoid fever, unspecified
- A01.01Typhoid meningitis
- A01.02Typhoid fever with heart involvement
- A01.03Typhoid pneumonia
- A01.04Typhoid arthritis
- A01.05Typhoid osteomyelitis
- A01.09Typhoid fever with other complications
- A01.1Paratyphoid fever A
- A01.2Paratyphoid fever B
- A01.3Paratyphoid fever C
- A01.4Paratyphoid fever, unspecified
- A02Other salmonella infections
- A02.0Salmonella enteritis
- A02.1Salmonella sepsis
- A02.2Localized salmonella infections
- A02.20Localized salmonella infection, unspecified
- A02.21Salmonella meningitis
- A02.22Salmonella pneumonia
- A02.23Salmonella arthritis
- A02.24Salmonella osteomyelitis
- A02.25Salmonella pyelonephritis
- A02.29Salmonella with other localized infection
- A02.8Other specified salmonella infections
- A02.9Salmonella infection, unspecified
- A03Shigellosis
- A03.0Shigellosis due to Shigella dysenteriae
- A03.1Shigellosis due to Shigella flexneri
- A03.2Shigellosis due to Shigella boydii
- A03.3Shigellosis due to Shigella sonnei
- A03.8Other shigellosis
- A03.9Shigellosis, unspecified
- A04Other bacterial intestinal infections
- A04.0Enteropathogenic Escherichia coli infection
- A04.1Enterotoxigenic Escherichia coli infection
- A04.2Enteroinvasive Escherichia coli infection
- A04.3Enterohemorrhagic Escherichia coli infection
- A04.4Other intestinal Escherichia coli infections
- A04.5Campylobacter enteritis
- A04.6Enteritis due to Yersinia enterocolitica
- A04.7Enterocolitis due to Clostridium difficile
- A04.71Enterocolitis due to Clostridium difficile, recurrent
- A04.72Enterocolitis due to Clostridium difficile, not specified as recurrent
- A04.8Other specified bacterial intestinal infections
- A04.9Bacterial intestinal infection, unspecified
- A05Other bacterial foodborne intoxications, not elsewhere classified
- A05.0Foodborne staphylococcal intoxication
- A05.1Botulism food poisoning
- A05.2Foodborne Clostridium perfringens [Clostridium welchii] intoxication
- A05.3Foodborne Vibrio parahaemolyticus intoxication
- A05.4Foodborne Bacillus cereus intoxication
- A05.5Foodborne Vibrio vulnificus intoxication
- A05.8Other specified bacterial foodborne intoxications
- A05.9Bacterial foodborne intoxication, unspecified
- A06Amebiasis
- A06.0Acute amebic dysentery
- A06.1Chronic intestinal amebiasis
- A06.2Amebic nondysenteric colitis
- A06.3Ameboma of intestine
- A06.4Amebic liver abscess
- A06.5Amebic lung abscess
- A06.6Amebic brain abscess
- A06.7Cutaneous amebiasis
- A06.8Amebic infection of other sites
- A06.81Amebic cystitis
- A06.82Other amebic genitourinary infections
- A06.89Other amebic infections
- A06.9Amebiasis, unspecified
- A07Other protozoal intestinal diseases
- A07.0Balantidiasis
- A07.1Giardiasis [lambliasis]
- A07.2Cryptosporidiosis
- A07.3Isosporiasis
- A07.4Cyclosporiasis
- A07.8Other specified protozoal intestinal diseases
- A07.9Protozoal intestinal disease, unspecified
- A08Viral and other specified intestinal infections
- A08.0Rotaviral enteritis
- A08.1Acute gastroenteropathy due to Norwalk agent and other small round viruses
- A08.11Acute gastroenteropathy due to Norwalk agent
- A08.19Acute gastroenteropathy due to other small round viruses
- A08.2Adenoviral enteritis
- A08.3Other viral enteritis
- A08.31Calicivirus enteritis
- A08.32Astrovirus enteritis
- A08.39Other viral enteritis
- A08.4Viral intestinal infection, unspecified
- A08.8Other specified intestinal infections
- A09Infectious gastroenteritis and colitis, unspecified
A00-A09 MS-DRGs
This code does not group to an MS-DRG as a principal diagnosis.
Other codes that refer to A00-A09
Notes on these codes point to A00-A09.
About the condition
Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.
Cholera
Cholera is a bacterial infection that causes diarrhea. The cholera bacterium is usually found in water or food that has been contaminated by feces (poop). Cholera is rare in the US. You may get it if you travel to parts of the world with poor water and sewage treatment. Outbreaks can also happen after disasters. The disease is not likely to spread directly from person to person.
Read more about cholera on MedlinePlus