Can my wife's medicare be reinstated?

Can my wife's medicare be reinstated after termination for non payment, back in January 2011 we were unable to make the quarterly payment you see the month before my wife got sick and had to go to the doctor,our doctor would no longer accept medicare so we went to the medicare website and called several doctors listed by medicare and none of them would accept it so we ended using our money to pay the bills. she has been off disability for 2.5 years and is a full time student..