ICD-10 · PDGM grouping
Y04 Assault by bodily force
All 12 codes in the Y04 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
12
Can lead a claim
0
Cannot lead a claim
12
What CMS assigns to Y04
None of the 12 codes is assigned a clinical group. None of the 12 is assigned a comorbidity subgroup. None can lead a claim.
Every code in Y04
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 |
|---|---|---|---|---|
| Y04.0 Assault by unarmed brawl or fight | ||||
| Y04.0XXA | Assault by unarmed brawl or fight, initial encounter | Cannot lead a claimExternal cause of injury code not reportable as principal diagnosis | None | None |
| Y04.0XXD | Assault by unarmed brawl or fight, subsequent encounter | Cannot lead a claimExternal cause of injury code not reportable as principal diagnosis | None | None |
| Y04.0XXS | Assault by unarmed brawl or fight, sequela | Cannot lead a claimExternal cause of injury code not reportable as principal diagnosis | None | None |
| Y04.1 Assault by human bite | ||||
| Y04.1XXA | Assault by human bite, initial encounter | Cannot lead a claimExternal cause of injury code not reportable as principal diagnosis | None | None |
| Y04.1XXD | Assault by human bite, subsequent encounter | Cannot lead a claimExternal cause of injury code not reportable as principal diagnosis | None | None |
| Y04.1XXS | Assault by human bite, sequela | Cannot lead a claimExternal cause of injury code not reportable as principal diagnosis | None | None |
| Y04.2 Assault by strike against or bumped into by another person | ||||
| Y04.2XXA | Assault by strike against or bumped into by another person, initial encounterCMS: Asslt by strike agnst or bumped into by another person, init | Cannot lead a claimExternal cause of injury code not reportable as principal diagnosis | None | None |
| Y04.2XXD | Assault by strike against or bumped into by another person, subsequent encounterCMS: Asslt by strike agnst or bumped into by another person, subs | Cannot lead a claimExternal cause of injury code not reportable as principal diagnosis | None | None |
| Y04.2XXS | Assault by strike against or bumped into by another person, sequelaCMS: Asslt by strike agnst or bumped into by another person, sqla | Cannot lead a claimExternal cause of injury code not reportable as principal diagnosis | None | None |
| Y04.8 Assault by other bodily force | ||||
| Y04.8XXA | Assault by other bodily force, initial encounter | Cannot lead a claimExternal cause of injury code not reportable as principal diagnosis | None | None |
| Y04.8XXD | Assault by other bodily force, subsequent encounter | Cannot lead a claimExternal cause of injury code not reportable as principal diagnosis | None | None |
| Y04.8XXS | Assault by other bodily force, sequela | 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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