I just did. I can't find the new CBA (signed in 2016, currently in effect) available to view online. Can you provide a link? I CAN find the previous CBA at mlbplayers.com. http://www.mlbplayers.com/ViewArticle.dbml?DB_OEM_ID=34000&ATCLID=211078089 It specifically states (pages 53-54) that only a team physician is needed to submit the necessary paperwork to the league for approval to place a player on a DL. Players may request, in writing, a second opinion, but this would not delay the original DL decision. Summaries of the new CBA published at the time it was signed include shortening the minimum DL stay from 15 to 10 days, but do not include, from what I can find, any indication of changes to the procedures to place a player on the DL. Bottom line: in the absence of contrary information, I don't think any additional medical review over and above the team physician, and approval by the commissioner's office, is required to place a player on the DL. It's very possible the separate concussion DL might be different, but again, without seeing the current CBA, I can't say for sure.