Anna - surprised that your Medicare (?) supplement covers when Part B doesn't. I always thought that Medigap only kicks after Medicare approval. I did not have much luck with CVS either, but only because they said they did not have ipratropium, which my doctor insists that had to be prescribed together with the sodium chloride. That turned out not to be true.

I should add that given all the different answers as to why coverage was denied it would be interesting to appeal and see what Medicare says officially.
Mary