10-day Injured List
The 10-day injured list (known as the 10-day disabled list until the end of the 2018 season) allows clubs to remove injured players from the 26-man active roster (it was 25, prior to 2020) 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 batter is diagnosed with a bruised hand on June 3 after getting hit by a pitch during a June 1 game, he could be placed on the 10-day injured list on June 3, 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.
MLB was set to bring back the 15-day injured list specifically for pitchers and two-way players (position players who are eligible to pitch in any circumstance) while instituting new restrictions on position players pitching for the 2020 season, but the rules were changed amid the COVID-19 pandemic.
Rather than a 10-day injured list for position players and 15-day injured list for pitchers and two-way players, the 10-day injured list remained in place for all players in the shortened season, and there were no restrictions on position players pitching. There was also a separate COVID-19 injured list that had no minimum duration, and the 60-day injured list was reduced to 45 days.