Happens all the time. If you didn't receive an explanation for the denialica, you need to request one in writing.
But it's a group plan. I had it before. Left the company for 3 months then came back and I was told I had to reapply. Had to send them 3 years of medical records and a doctors note. Didnt have to do that the first time.
I can be turned down for a group plan that doesn't require anything to get the life insurance accept be employed by the company?
So, yes, you can be turned down for the group medical this time.