The NFL made a formal inquiry, reviewing practice and game video before determining that Reed should have been listed on the injury report due to the torn labrum in his shoulder and because he fully participated.
Regardless, the NFL emphasized the Ravens had erred by omitting Reed from the injury report.
The injury report states: "All players with significant or noteworthy injuries must be listed on the report, even if the player takes all the reps in practice, and even if the team is certain that he will play in the upcoming game. This is especially true of key players and those players whose injuries have been covered extensively by the media."
Earlier this week, Ravens coach John Harbaugh defended the team not listing Reed on the injury report.
"I have no problem with that, the game tape and the practice tape," Harbaugh said. "What they'll find is that he's practiced 100 percent all of the time and played in all of the games. He hasn't missed any game time because of injuries. Our understanding of the rule has been that if they don't miss any time because of injury they don't have to be on the injury report. So, there's some nuances there.
"I'm very confident that we understand that rule as well as anyone in the league. We've kept the injury report very tight. We've kept it to the guys that have to be on the injury report, not that we're trying to hide any injuries, but we could do what some other teams do and put a bunch of guys on there. I'd be just as happy to do that. We could put all of the guys on the injury report. Whatever they tell us to do, we'll do. We're trying to follow the rules."
The NFL previously fined the Buffalo Bills and the Washington Redskins $20,000 apiece for injury report violations involving defensive end Mario Williams and quarterback Robert Griffin III, respectively.
Last week, Reed downplayed the severity of the injury and not being on the injury report.
"I ain't drop no bombshell, man," Reed said. "I ain't no pitcher. I don't play baseball. ... I don't know why it doesn't go on. I'm sure a lot of guys have been through this league and had injuries and it's not reported.
"That's the physical part of the game and a part of the game that the fans and y'all don't anything about. That's the part that we have to deal with from a worker's compensation situation, so to say."
Meanwhile, strong safety Bernard Pollard was fined $7,875 for unnecessary roughness for a facemask penalty against the Texans.