Iris Lilies,
It saddens me to hear that the billing around your mammogram is causing you anxiety.
I have been a Medicare client for a few years, and I have had my share of surprise billings as well.
I learned that I have to adopt a new attitude to bills from health care providers. All my life I believed that I should strive to pay every bill the same day I received it. "Cash on the barrel-head". In the indoctrination by my WASP parents, I was bred to the bone to owe no one anything after payday.
Since I have been on Medicare, on medical billings I have learned to let them ripen a bit. And I question the "coding", if that may been the reason Medicare does not cover the procedure. Apart from one costly failure on a shingles vaccination, I have generally been successful .