It's possible, but it's a longshot.
Whatever you send to the service medical waiver authority will get reviewed by the DoDMERB case manager and physician. IF that additional info makes it CLEAR that the diagnosis didn't exist, and therefore in error, the DQ will be removed.
If the diagnosis is in the medical records and there isn't irrefutable evidence that the diagnosis wasn't really a true diagnosis, then it is what it is. It's hard to overturn something like that.
At that point, it's a DQ at the DoDMERB level for the service medical waiver authority to sort out.
There are times the service medical waiver authority will call DoDMERB and ask why a condition was a DQ. If they mutually come to a conclusion that the diagnosis was an overcall or an error, then the DQ is removed. Sometimes the medical waiver authority won't call DoDMERB. They will just see the diagnosis was an overcall or determine it's an error and just grant the waiver.
I think the best chance you have to overturn it is submit the AMI that was requested and write a memo stating why you believe the diagnosis was wrong and the attached documents prove it. You can write the memo or, even better, a treating physician can do it.
DoDMERB will relook. It's not common to reverse a DQ, but it can happen.