ICD-10 · PDGM grouping
A08 Viral and other specified intestinal infections
All 9 codes in the A08 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
9
Can lead a claim
9
Cannot lead a claim
0
What CMS assigns to A08
All 9 codes group to MMTA - Infectious Disease, Neoplasms, and Blood-Forming Diseases. None of the 9 is assigned a comorbidity subgroup. Every code can lead a claim.
Every code in A08
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 |
|---|---|---|---|---|
| A08.0 | Rotaviral enteritis | Can lead a claim | K | None |
| A08.1 Acute gastroenteropathy due to Norwalk agent and other small round viruses | ||||
| A08.11 | Acute gastroenteropathy due to Norwalk agent | Can lead a claim | K | None |
| A08.19 | Acute gastroenteropathy due to other small round viruses | Can lead a claim | K | None |
| A08.2 | Adenoviral enteritis | Can lead a claim | K | None |
| A08.3 Other viral enteritis | ||||
| A08.31 | Calicivirus enteritis | Can lead a claim | K | None |
| A08.32 | Astrovirus enteritis | Can lead a claim | K | None |
| A08.39 | Other viral enteritis | Can lead a claim | K | None |
| A08.4 | Viral intestinal infection, unspecified | Can lead a claim | K | None |
| A08.8 | Other specified intestinal infections | 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.
The monthly home health regs digest
What CMS changed, what's due next, and what to do about it — one email a month, no fluff. Read the first issue