Dear MariaE431: Based on your typed report, there are no abnormalities. I would definately ask your insurance company to reconsider. As it would happen, most insurance carriers can deny coverage for a period of time (a year) but not forever. You should check with your benefits department.
The key is you have to have been continuously covered. So if you were covered during the time when you had the mammo's, and then all that happened was your company changed insurers, they absolutely can't deny you. If you changed jobs, or had a lapse in insurance greater than 60 days, then you are subject to a waiting period, usually 90 days, before they will pick up coverage again.
FOLLOW UP WITH THE INSURANCE CO. Don't let the bastards get you down.