UPDATE:

Just got an email response from T. She says as far as she knows she is still in-network and that this is just another one of insurance's tricks to not pay claims. She says "reprocessing" is always next after a deny as they hope people will forget about it so they don't have to pay. (Yes, my T hates insurance companies.) She said most people don't stay on top of it so it's a breath of fresh air that I am. She said not to worry and to enjoy the holiday weeked. Now just to wait.

Ack!