Breast Pump

So I was informed that I can get a free or discounted breast pump through insurance. Which is wonderful because they do tend to be pretty pricey. After talking to my insurance company, they said I need to contact the suppliers to see if they are in network and carry the pumps. I looked at the information and it all says I can register online. Have any other moms done this? Will it provide accurate information on if I have to pay anything?