10-day Injured List
The 10-day injured list allows clubs to remove injured position players from the 26-man active roster while keeping them on the 40-man roster. There is a separate 15-day injured list for pitchers and two-way players.
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. The maximum an IL stint can be backdated is three days, even if a player hasn't appeared in a game for longer than that. For instance, if a player last played on June 1 but isn't placed on the 10-day IL until June 7, the player's team can backdate the 10-day IL stint to June 4. He would be eligible to return from the IL on June 14.
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 brought back the 15-day IL for pitchers and two-way players in 2022, with the 10-day IL remaining in place for position players.