3-D Mammogram NOT being covered 100% NOW!!!

Why was my DIAGNOSTIC 3-d Mammogram covered 100% 4  years ago but now you are sticking me with an $800.00 "portion you may owe" ?  NOTHING has changed as far as the coding for the mammogram from then until now!  I have a personal and family history of breast issues / cancer so what it your reasoning? 

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