| W21.00 | Struck by hit or thrown ball, unspecified type | NON-BILLABLE CODE |
| W21.00XA | Struck by hit or thrown ball, unspecified type, initial encounter | BILLABLE CODE |
| W21.00XD | Struck by hit or thrown ball, unspecified type, subsequent encounter | BILLABLE CODE |
| W21.00XS | Struck by hit or thrown ball, unspecified type, sequela | BILLABLE CODE |
| W21.01 | Struck by football | NON-BILLABLE CODE |
| W21.01XA | Struck by football, initial encounter | BILLABLE CODE |
| W21.01XD | Struck by football, subsequent encounter | BILLABLE CODE |
| W21.01XS | Struck by football, sequela | BILLABLE CODE |
| W21.02 | Struck by soccer ball | NON-BILLABLE CODE |
| W21.02XA | Struck by soccer ball, initial encounter | BILLABLE CODE |
| W21.02XD | Struck by soccer ball, subsequent encounter | BILLABLE CODE |
| W21.02XS | Struck by soccer ball, sequela | BILLABLE CODE |
| W21.03 | Struck by baseball | NON-BILLABLE CODE |
| W21.03XA | Struck by baseball, initial encounter | BILLABLE CODE |
| W21.03XD | Struck by baseball, subsequent encounter | BILLABLE CODE |
| W21.03XS | Struck by baseball, sequela | BILLABLE CODE |
| W21.04 | Struck by golf ball | NON-BILLABLE CODE |
| W21.04XA | Struck by golf ball, initial encounter | BILLABLE CODE |
| W21.04XD | Struck by golf ball, subsequent encounter | BILLABLE CODE |
| W21.04XS | Struck by golf ball, sequela | BILLABLE CODE |
| W21.05 | Struck by basketball | NON-BILLABLE CODE |
| W21.05XA | Struck by basketball, initial encounter | BILLABLE CODE |
| W21.05XD | Struck by basketball, subsequent encounter | BILLABLE CODE |
| W21.05XS | Struck by basketball, sequela | BILLABLE CODE |
| W21.06 | Struck by volleyball | NON-BILLABLE CODE |
| W21.06XA | Struck by volleyball, initial encounter | BILLABLE CODE |
| W21.06XD | Struck by volleyball, subsequent encounter | BILLABLE CODE |
| W21.06XS | Struck by volleyball, sequela | BILLABLE CODE |
| W21.07 | Struck by softball | NON-BILLABLE CODE |
| W21.07XA | Struck by softball, initial encounter | BILLABLE CODE |
| W21.07XD | Struck by softball, subsequent encounter | BILLABLE CODE |
| W21.07XS | Struck by softball, sequela | BILLABLE CODE |
| W21.09 | Struck by other hit or thrown ball | NON-BILLABLE CODE |
| W21.09XA | Struck by other hit or thrown ball, initial encounter | BILLABLE CODE |
| W21.09XD | Struck by other hit or thrown ball, subsequent encounter | BILLABLE CODE |
| W21.09XS | Struck by other hit or thrown ball, sequela | BILLABLE CODE |
