W21.09Struck by other hit or thrown ball

W21.09 is the ICD-10-CM diagnosis code for struck by other hit or thrown ball. It belongs to category W21 (striking against or struck by sports equipment), block W20-W49 (exposure to inanimate mechanical forces) and chapter 20 (external causes of morbidity). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.

Within W21.0, choose W21.09 (other hit or thrown ball) only when documentation doesn't support a more specific option: unspecified type (W21.00), football (W21.01), soccer ball (W21.02), baseball (W21.03), golf ball (W21.04), basketball (W21.05), volleyball (W21.06) and softball (W21.07).

Codes in this range require a 7th character: A for initial encounter, D for subsequent encounter and S for sequela. Use placeholder "X" characters to fill any empty positions before the 7th character.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.