The 10-day injured list (known as the 10-day disabled list until the end of the 2018 season) allows clubs to remove players from the 25-man active roster while keeping them on the 40-man roster. Players can be placed on the 10-day injured list for any type of injury, though players with concussion symptoms are first sent to the 7-day injured list. Players on the 10-day injured list must remain out of action for at least 10 days, though a player can also stay on the list for considerably longer than 10 days, if necessary.
Players may be placed on the 10-day injured list "retroactively," meaning the stint is backdated to the day after the last date on which the player appeared in a game. For instance, if a pitcher is diagnosed with elbow inflammation on June 4 after feeling soreness during his June 1 start, he could be placed on the 10-day injured list on June 4, retroactive to June 2. In that case, he would be eligible to return from the injured list on June 12.
After the 2018 season, the 7-day disabled list (or "DL"), 10-day disabled list and 60-day disabled list were renamed, becoming the 7-day injured list, the 10-day injured list and the 60-day injured list.
As part of the 2017-21 Collective Bargaining Agreement, the 10-day injured list replaced the 15-day injured list as the shortest option for non-concussion injuries. Baseball had a 10-day injured list at various points through its history before it was dropped in 1984.
Impending rule change that will go into effect at the start of the 2020 season
Beginning in 2020, the 15-day injured list will be restored, replacing the 10-day injured list as the shortest option for non-concussion injuries.
Nationals shortstop Trea Turner suffered a right hamstring strain during a game on April 8, 2017, and was placed on the 10-day injured list on April 10, retroactive to April 9. He was activated April 21.