Most of the fortune 100 companies carry an HRC raiting. To get a 100, the have to cover transgender surgeries. Check on your companies raiting. If it is 100, there will be someone in charge of keeping that. Find them or talk with HR.
Second, most fortune 100 companies are self insured and tey use an insurance company to run the paperwork. It is probable that someone dropped the ball in your company. Again, talk to HR once you find out the HRC score and if you are self insured.
I can help with this. You may PM me. I, too, work for fortune 100 company.
Hugs,
Jen