"Army clarifies guidance for Purple Heart award for concussion injuries" from U. S. Army Human Resources Command.
Qualification for the Purple Heart for concussion injuries include mild traumatic brain and concussive injuries that do not result in a loss of consciousness.
If you have previously been denied a Purple Heart for something like this, you may reapply and are encouraged to do so by following the directions in the memo.
If you're entitled to this award, why not go for it?
Thanks to Military.com for the head's-up on this!