I think the I stands for International, not Independent. While I don't doubt that's how insurance companies think, my guess was that they just aren't familiar with IBCLCs. They're allowing RNs because that's a standard qualification they've dealt with before (and is licensed and regulated by states). Plus, lots of LCs who were RNs were able to bill insurance before. They just treated it similarly to when you go to the pediatrician for something routine and all you see is a nurse.
FYI...I filled out the insurance information and picked up my pump on Saturday. I got it from a medical supply company and was surprised that the Medela PISA pumps there don't come with the "stylish" backpack or shoulder bags which saves you $45 off the retail price. They do come in a bag but it kind of looks like a tan soft sided cooler. Another way to save some money if insurance isn't paying and you're on a budget.
:lol I agree that those bags aren't stylish. And anyone who has ever pumped will agree that it is obvious what is in them. :D