$1.$ External cause code$($s$)$:

Y$04\mathrm{.}0$XXA Fight, see Assault, fight, initial encounter;

Y$92\mathrm{.}39$ Place of occurrence, stadium;

Y$93\mathrm{.}82$ Activity, spectator at an event;

Y$99\mathrm{.}8$ External cause status, student activity

Rationale for selecting the external cause of morbidity codes:

The event or accident that was the cause of the injury: Fight between spectators that is referred to as an assault by fighting.

This was the initial encounter.

The place where the event or accident occurred: Sports stadium.

The activity of the patient at the time the event or accident occurred: Patient was a spectator at a sports event.

The status of the patient at the time the event or accident occurred: Patient was a student.