ICD-10 · PDGM grouping
A09 Infectious gastroenteritis and colitis, unspecified
The one code in the A09 family, with the PDGM clinical group, comorbidity subgroup and primary-position rule CMS assigns, read from the CMS grouper crosswalk v07.2.26 and the CDC FY2027 code file.
Codes in family
1
Can lead a claim
1
Cannot lead a claim
0
What CMS assigns to A09
This code groups to MMTA - Infectious Disease, Neoplasms, and Blood-Forming Diseases. It is assigned no comorbidity subgroup. It can lead a claim.
The A09 code
Descriptions are CDC’s FY2027 wording; where CMS’s grouper abbreviates one, its form is shown beneath.
| Code | Description | Primary position | Clinical group | Comorbidity subgroup |
|---|---|---|---|---|
| A09 | Infectious gastroenteritis and colitis, unspecified | Can lead a claim | K | None |
Sources: CMS HH PPS Grouper Software v07.2.26, effective 2026-10-01, for the clinical group, comorbidity subgroup, code-first conventions and primary-position flags; CDC NCHS ICD-10-CM FY2027 code descriptions for the family title and code wording. 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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