In simple words: Injury caused by striking against a diving board.

Striking against diving board. Use additional code for subsequent falling into water, if applicable (W16.-)

Example 1: A patient jumps towards a diving board, misjudges their trajectory, and strikes their head on the board before falling into the water. The appropriate codes are W21.4 (striking against diving board) and W16.- (falling into water) along with codes for the specific injuries sustained (e.g., concussion, laceration)., A child playing on a diving board slips and hits their leg on the board. They do not fall into the water. The code W21.4 is used to indicate the cause of the injury, along with any codes for the specific injury (e.g., contusion, fracture)., A diver slips on a wet diving board before attempting a dive, striking their arm on the board's edge. The code W21.4 accurately describes the event leading to their injuries, along with specific injury codes (e.g., sprain, strain).

Documentation should clearly describe the event, noting that the patient struck a diving board and specifying the body part(s) affected. If a subsequent fall into water occurred, this should also be documented. The documentation should also include the diagnoses of any injuries resulting from the event.

** External cause codes are used to provide additional data for injury research and evaluation of injury prevention strategies. While reporting of these codes is generally not mandatory, it is encouraged to provide a more complete picture of the injury event.