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 v07.2.26.
ICD-10-CM FY2027 · CMS grouper v07.2.26
Codes in range
79
No clinical group
0
A period cannot be grouped from these.
Barred as primary
0
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.
Code families in A00-A09
One page per three-character family: every code in it, whether it can lead a claim, its clinical group and comorbidity subgroup.
- A00Cholera3 codes
- A01Typhoid and paratyphoid fevers11 codes
- A02Other salmonella infections11 codes
- A03Shigellosis6 codes
- A04Other bacterial intestinal infections11 codes
- A05Other bacterial foodborne intoxications, not elsewhere classified8 codes
- A06Amebiasis12 codes
- A07Other protozoal intestinal diseases7 codes
- A08Viral and other specified intestinal infections9 codes
- A09Infectious gastroenteritis and colitis, unspecified1 code
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 | Can lead a claim |
| A001 | Cholera due to Vibrio cholerae 01, biovar eltor | K | Can lead a claim |
| A009 | Cholera, unspecified | K | Can lead a claim |
| A0100 | Typhoid fever, unspecified | K | Can lead a claim |
| A0101 | Typhoid meningitis | B | Can lead a claim |
| A0102 | Typhoid fever with heart involvement | K | Can lead a claim |
| A0103 | Typhoid pneumonia | K | Can lead a claim |
| A0104 | Typhoid arthritis | K | Can lead a claim |
| A0105 | Typhoid osteomyelitis | K | Can lead a claim |
| A0109 | Typhoid fever with other complications | K | Can lead a claim |
| A011 | Paratyphoid fever A | K | Can lead a claim |
| A012 | Paratyphoid fever B | K | Can lead a claim |
| A013 | Paratyphoid fever C | K | Can lead a claim |
| A014 | Paratyphoid fever, unspecified | K | Can lead a claim |
| A020 | Salmonella enteritis | K | Can lead a claim |
| A021 | Salmonella sepsis | K | Can lead a claim |
| A0220 | Localized salmonella infection, unspecified | K | Can lead a claim |
| A0221 | Salmonella meningitis | B | Can lead a claim |
| A0222 | Salmonella pneumonia | K | Can lead a claim |
| A0223 | Salmonella arthritis | E | Can lead a claim |
| A0224 | Salmonella osteomyelitis | K | Can lead a claim |
| A0225 | Salmonella pyelonephritis | K | Can lead a claim |
| A0229 | Salmonella with other localized infection | K | Can lead a claim |
| A028 | Other specified salmonella infections | K | Can lead a claim |
| A029 | Salmonella infection, unspecified | K | Can lead a claim |
| A030 | Shigellosis due to Shigella dysenteriae | K | Can lead a claim |
| A031 | Shigellosis due to Shigella flexneri | K | Can lead a claim |
| A032 | Shigellosis due to Shigella boydii | K | Can lead a claim |
| A033 | Shigellosis due to Shigella sonnei | K | Can lead a claim |
| A038 | Other shigellosis | K | Can lead a claim |
| A039 | Shigellosis, unspecified | K | Can lead a claim |
| A040 | Enteropathogenic Escherichia coli infection | K | Can lead a claim |
| A041 | Enterotoxigenic Escherichia coli infection | K | Can lead a claim |
| A042 | Enteroinvasive Escherichia coli infection | K | Can lead a claim |
| A043 | Enterohemorrhagic Escherichia coli infection | K | Can lead a claim |
| A044 | Other intestinal Escherichia coli infections | K | Can lead a claim |
| A045 | Campylobacter enteritis | K | Can lead a claim |
| A046 | Enteritis due to Yersinia enterocolitica | K | Can lead a claim |
| A0471 | Enterocolitis due to Clostridium difficile, recurrent | K | Can lead a claim |
| A0472 | Enterocolitis d/t Clostridium difficile, not spcf as recur | K | Can lead a claim |
| A048 | Other specified bacterial intestinal infections | K | Can lead a claim |
| A049 | Bacterial intestinal infection, unspecified | K | Can lead a claim |
| A050 | Foodborne staphylococcal intoxication | K | Can lead a claim |
| A051 | Botulism food poisoning | K | Can lead a claim |
| A052 | Foodborne Clostridium perfringens intoxication | K | Can lead a claim |
| A053 | Foodborne Vibrio parahaemolyticus intoxication | K | Can lead a claim |
| A054 | Foodborne Bacillus cereus intoxication | K | Can lead a claim |
| A055 | Foodborne Vibrio vulnificus intoxication | K | Can lead a claim |
| A058 | Other specified bacterial foodborne intoxications | K | Can lead a claim |
| A059 | Bacterial foodborne intoxication, unspecified | K | Can lead a claim |
| A060 | Acute amebic dysentery | K | Can lead a claim |
| A061 | Chronic intestinal amebiasis | K | Can lead a claim |
| A062 | Amebic nondysenteric colitis | K | Can lead a claim |
| A063 | Ameboma of intestine | K | Can lead a claim |
| A064 | Amebic liver abscess | K | Can lead a claim |
| A065 | Amebic lung abscess | K | Can lead a claim |
| A066 | Amebic brain abscess | K | Can lead a claim |
| A067 | Cutaneous amebiasis | K | Can lead a claim |
| A0681 | Amebic cystitis | K | Can lead a claim |
| A0682 | Other amebic genitourinary infections | K | Can lead a claim |
| A0689 | Other amebic infections | K | Can lead a claim |
| A069 | Amebiasis, unspecified | K | Can lead a claim |
| A070 | Balantidiasis | K | Can lead a claim |
| A071 | Giardiasis [lambliasis] | K | Can lead a claim |
| A072 | Cryptosporidiosis | K | Can lead a claim |
| A073 | Isosporiasis | K | Can lead a claim |
| A074 | Cyclosporiasis | K | Can lead a claim |
| A078 | Other specified protozoal intestinal diseases | K | Can lead a claim |
| A079 | Protozoal intestinal disease, unspecified | K | Can lead a claim |
| A080 | Rotaviral enteritis | K | Can lead a claim |
| A0811 | Acute gastroenteropathy due to Norwalk agent | K | Can lead a claim |
| A0819 | Acute gastroenteropathy due to other small round viruses | K | Can lead a claim |
| A082 | Adenoviral enteritis | K | Can lead a claim |
| A0831 | Calicivirus enteritis | K | Can lead a claim |
| A0832 | Astrovirus enteritis | K | Can lead a claim |
| A0839 | Other viral enteritis | K | Can lead a claim |
| A084 | Viral intestinal infection, unspecified | K | Can lead a claim |
| A088 | Other specified intestinal infections | K | Can lead a claim |
| A09 | Infectious gastroenteritis and colitis, unspecified | K | Can lead a claim |
Source: CMS HH PPS Grouper Software v07.2.26, effective 2026-10-01. 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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