Approval from CCN, First Health?
If you look on the left hand side of this page you will see where it says "Insurers" click on that link and then click on "C" and scroll down. There is someone that commented on CCN - who was approved. So that would be the best way I know. Also call them and ask. they have to tell you what their guidelines are.
Hope your weather isn't to bad. I'm in Dodgeville. Not to far from you. It is pouring the rain here off and on this afternoon. In Barneveld it was 36 degrees and the windchill made it 29 -- which means this stuff will be melting from earlier and then now freezing.
Good Luck.
Gala