ICD-10 · PDGM grouping

A00-A09 — Intestinal infectious diseases

Every ICD-10-CM code in this range and the PDGM clinical group CMS assigns to it, read from the CMS grouper crosswalk v07.1.26.

OASIS-E2 v1.00.0 · ingested 2026-04-26

Codes in range

No clinical group

A period cannot be grouped from these.

Barred as primary

CMS rejects these in the primary position.

Where these codes group

76 of the 79 codes in A00-A09 group to MMTA - Infectious Disease, Neoplasms, and Blood-Forming Diseases, but the range is not uniform — it spreads across 3 clinical groups. Every code here is assigned a group.

Every code in A00-A09

Descriptions are CMS’s own, abbreviated as CMS abbreviates them.

Code	Description	Clinical group	Primary position
A000	Cholera due to Vibrio cholerae 01, biovar cholerae	K	Accepted
A001	Cholera due to Vibrio cholerae 01, biovar eltor	K	Accepted
A009	Cholera, unspecified	K	Accepted
A0100	Typhoid fever, unspecified	K	Accepted
A0101	Typhoid meningitis	B	Accepted
A0102	Typhoid fever with heart involvement	K	Accepted
A0103	Typhoid pneumonia	K	Accepted
A0104	Typhoid arthritis	K	Accepted
A0105	Typhoid osteomyelitis	K	Accepted
A0109	Typhoid fever with other complications	K	Accepted
A011	Paratyphoid fever A	K	Accepted
A012	Paratyphoid fever B	K	Accepted
A013	Paratyphoid fever C	K	Accepted
A014	Paratyphoid fever, unspecified	K	Accepted
A020	Salmonella enteritis	K	Accepted
A021	Salmonella sepsis	K	Accepted
A0220	Localized salmonella infection, unspecified	K	Accepted
A0221	Salmonella meningitis	B	Accepted
A0222	Salmonella pneumonia	K	Accepted
A0223	Salmonella arthritis	E	Accepted
A0224	Salmonella osteomyelitis	K	Accepted
A0225	Salmonella pyelonephritis	K	Accepted
A0229	Salmonella with other localized infection	K	Accepted
A028	Other specified salmonella infections	K	Accepted
A029	Salmonella infection, unspecified	K	Accepted
A030	Shigellosis due to Shigella dysenteriae	K	Accepted
A031	Shigellosis due to Shigella flexneri	K	Accepted
A032	Shigellosis due to Shigella boydii	K	Accepted
A033	Shigellosis due to Shigella sonnei	K	Accepted
A038	Other shigellosis	K	Accepted
A039	Shigellosis, unspecified	K	Accepted
A040	Enteropathogenic Escherichia coli infection	K	Accepted
A041	Enterotoxigenic Escherichia coli infection	K	Accepted
A042	Enteroinvasive Escherichia coli infection	K	Accepted
A043	Enterohemorrhagic Escherichia coli infection	K	Accepted
A044	Other intestinal Escherichia coli infections	K	Accepted
A045	Campylobacter enteritis	K	Accepted
A046	Enteritis due to Yersinia enterocolitica	K	Accepted
A0471	Enterocolitis due to Clostridium difficile, recurrent	K	Accepted
A0472	Enterocolitis d/t Clostridium difficile, not spcf as recur	K	Accepted
A048	Other specified bacterial intestinal infections	K	Accepted
A049	Bacterial intestinal infection, unspecified	K	Accepted
A050	Foodborne staphylococcal intoxication	K	Accepted
A051	Botulism food poisoning	K	Accepted
A052	Foodborne Clostridium perfringens intoxication	K	Accepted
A053	Foodborne Vibrio parahaemolyticus intoxication	K	Accepted
A054	Foodborne Bacillus cereus intoxication	K	Accepted
A055	Foodborne Vibrio vulnificus intoxication	K	Accepted
A058	Other specified bacterial foodborne intoxications	K	Accepted
A059	Bacterial foodborne intoxication, unspecified	K	Accepted
A060	Acute amebic dysentery	K	Accepted
A061	Chronic intestinal amebiasis	K	Accepted
A062	Amebic nondysenteric colitis	K	Accepted
A063	Ameboma of intestine	K	Accepted
A064	Amebic liver abscess	K	Accepted
A065	Amebic lung abscess	K	Accepted
A066	Amebic brain abscess	K	Accepted
A067	Cutaneous amebiasis	K	Accepted
A0681	Amebic cystitis	K	Accepted
A0682	Other amebic genitourinary infections	K	Accepted
A0689	Other amebic infections	K	Accepted
A069	Amebiasis, unspecified	K	Accepted
A070	Balantidiasis	K	Accepted
A071	Giardiasis [lambliasis]	K	Accepted
A072	Cryptosporidiosis	K	Accepted
A073	Isosporiasis	K	Accepted
A074	Cyclosporiasis	K	Accepted
A078	Other specified protozoal intestinal diseases	K	Accepted
A079	Protozoal intestinal disease, unspecified	K	Accepted
A080	Rotaviral enteritis	K	Accepted
A0811	Acute gastroenteropathy due to Norwalk agent	K	Accepted
A0819	Acute gastroenteropathy due to other small round viruses	K	Accepted
A082	Adenoviral enteritis	K	Accepted
A0831	Calicivirus enteritis	K	Accepted
A0832	Astrovirus enteritis	K	Accepted
A0839	Other viral enteritis	K	Accepted
A084	Viral intestinal infection, unspecified	K	Accepted
A088	Other specified intestinal infections	K	Accepted
A09	Infectious gastroenteritis and colitis, unspecified	K	Accepted

Source: CMS HH PPS Grouper Software v07.1.26, effective 2026-04-01. This is the crosswalk Medicare runs a claim through. Grouping also depends on admission source, timing, the OASIS functional items and the rest of the diagnosis list.

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A00-A09 — Intestinal infectious diseases

Where these codes group

Every code in A00-A09

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