Breast pump and insurance questions

bananers

I'm due in May. I know it's a ways off, but I was trying to figure out if we'll need to buy our own breast pump. I called my insurance (Cigna) and they said it's covered 100% if we get it through Care Centrix. The only catch is that we have to have a doctor prescription and "diagnosis." I'll ask my doctor about this, but does that mean I have to have some sort of "issue" besides the fact that I'll be returning to work after 3 months and I wan to BF for a year? Also, I forgot to ask whether the 100% coverage includes renting or buying a pump, but the rep said the Ameda Purely Yours is the most common one people get, so I'm thinking that would be buying a pump? The Care Centrix rep said the doctor could request any brand though, but that the claim might take longer to go through the more picky/specific we were.

Thoughts, experiences? The Ameda Purely Yours looks like it gets pretty good reviews. If we could get this 100% covered by insurance and would allow me to keep BFing for a year, that sounds great! I'm just wondering if there's some catch, and whether needing a "diagnosis" is where things could get hung up...