I just wanted to share that I've been ordering from the Mayo Clinic Store
that sells CPAP equipment and supplies. I call their 800 number and place my orders. The people have been very nice and knowledgeable. They carry the most popular masks . . . even the Aeomed Headrest! And, yes, even a "tennis ball tee shirt" to keep you off your back!
I am over 65 and have Medicare as my primary insurer and United Healthcare as my secondary. The Mayo clinic store has no problem billing Medicare for me. They have very user-friendly information regarding Medicare guidelines for ordering, and information on private health insurance as well.
Here is their excellent & informative online catalog with phone number for ordering: http://www.mayoclinic.org/mcitems/mc1200-mc1299/mc1234-60.pdf
Hope this is useful to other senior & private insurance CPAPers out there.