Yes. My DS had congressional interview in November. During the the interview, the panel was aware of his medical DQ and completed remedial. At the time of the interview, DS had NOT received medical waiver yet, but the doctor who did the remedial had mailed a letter to our home that indicated the remedial tests were negative.
The panel asked for a copy of that letter and requested my son bring it to the congressman's office by the next day. Fortunately we had brought the letter to the interview (along with a binder of information - all the paperwork DS has received from USNA, physicians, etc.), so secretary made a copy right then and there.
In the end, my son did receive congressional nomination. Three days after getting nomination, received letter from USNA Office of Admissions that medical waiver was granted. So it all worked out and we were grateful that the doctor had mailed a letter to our home with test results. Even though it was not an official letter from DoDMERB, it seemed to satisfy the interview panel, because DS got the nom.