ICD-10 · PDGM grouping
B34 Viral infection of unspecified site
All 7 codes in the B34 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
7
Can lead a claim
5
Cannot lead a claim
2
What CMS assigns to B34
5 of the 7 codes group to MMTA - Infectious Disease, Neoplasms, and Blood-Forming Diseases; 2 are assigned no clinical group. None of the 7 is assigned a comorbidity subgroup. 5 of the 7 can lead a claim.
Every code in B34
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 |
|---|---|---|---|---|
| B34.0 | Adenovirus infection, unspecified | Can lead a claim | K | None |
| B34.1 | Enterovirus infection, unspecified | Can lead a claim | K | None |
| B34.2 | Coronavirus infection, unspecified | Can lead a claim | K | None |
| B34.3 | Parvovirus infection, unspecified | Can lead a claim | K | None |
| B34.4 | Papovavirus infection, unspecified | Can lead a claim | K | None |
| B34.8 | Other viral infections of unspecified site | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | None |
| B34.9 | Viral infection, unspecified | Cannot lead a claimPrincipal diagnosis not assigned to a clinical group | None | 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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