Hi, I am currently doing DME billing and yes Medicare does pay 2ndary. If you have a Medicare Fee schedule you can easily determine what the potential payment can be. They also have on the Medicare website a calculation tool that you can you. I will tell you that you need to be very informed about this because sometimes Medicare can OVERPAY!!! If this happens notify them immediately so that they can review the claim. The one thing you don't want (outside of the recoupment, which they will get) is a Medicare audit of your practice!!!