ICD-10 · PDGM grouping
W57 Bitten or stung by nonvenomous insect and other nonvenomous arthropods
All 3 codes in the W57 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
3
Can lead a claim
0
Cannot lead a claim
3
What CMS assigns to W57
None of the 3 codes is assigned a clinical group. None of the 3 is assigned a comorbidity subgroup. None can lead a claim.
Every code in W57
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 |
|---|---|---|---|---|
| W57.XXXA | Bitten or stung by nonvenomous insect and other nonvenomous arthropods, initial encounterCMS: Bit/stung by nonvenom insect & oth nonvenom arthropods, init | Cannot lead a claimExternal cause of injury code not reportable as principal diagnosis | None | None |
| W57.XXXD | Bitten or stung by nonvenomous insect and other nonvenomous arthropods, subsequent encounterCMS: Bit/stung by nonvenom insect & oth nonvenom arthropods, subs | Cannot lead a claimExternal cause of injury code not reportable as principal diagnosis | None | None |
| W57.XXXS | Bitten or stung by nonvenomous insect and other nonvenomous arthropods, sequelaCMS: Bit/stung by nonvenom insect & oth nonvenom arthropods, sqla | Cannot lead a claimExternal cause of injury code not reportable as principal diagnosis | 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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