its never happened to me ...yet.....trying to figure these things out will just drive you over the edge.....who knows if there is a rhyme or reason...they may have just decided to review all of one type of cases every year this year.....next year it might be another.....it could be a computer glitch....you will never know so just keep going to the doctor....fill out the form and send it back in and try not to worry too much about it. i know easier said than done, but there really isnt anything we can do about it except stay current.