It is a specimen oak, I am down to 4 plus this one. I lost one about 3 years ago, it was struck and lived about 5 years after that. I'll call the arborist and see what he says, but it is missing a large strip of bark.
This Oak is really tall and helps provide a lot of shade to the back, and would be sorely missed. I do have to keep on top of it as it is close enough to the house to possibly cause damage if it fell the right way.