W21 vs Y08.0
W21 (Striking against or struck by sports equipment) compared with Y08.0 (Assault by strike by sport equipment), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Can these codes be reported together?
No — do not report together. W21 carries an Excludes1 note covering Y08.0: “assault with sports equipment (Y08.0-)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Side by side
| W21Striking against or struck by sports equipment | Y08.0Assault by strike by sport equipment | |
|---|---|---|
| Billing status | Non-billable header Report instead: W21.00XA, W21.00XD, W21.00XS, W21.01XA, W21.01XD | Non-billable header Report instead: Y08.01XA, Y08.01XD, Y08.01XS, Y08.02XA, Y08.02XD |
| Classification | V00-Y99 — External Causes of Morbidity (V00-Y99) | V00-Y99 — External Causes of Morbidity (V00-Y99) |
| Definition | Striking against or struck by sports equipment is a non-billable ICD-10-CM category code (W21). | Assault by strike by sport equipment is a non-billable ICD-10-CM category code (Y08.0). |
| 7th character | The appropriate 7th character is to be added to each code from category W21 | The appropriate 7th character is to be added to each code from category Y08 |
| Includes | — | homicide injuries inflicted by another person with intent to injure or kill, by any means |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources