From the story here:
The Mercatus analysis estimated the 10-year cost of "Medicare for all" from 2022 to 2031 [at $32.6 trillion], after an initial phase-in. Its findings are similar to those of several independent studies of Sanders' 2016 plan. Those studies found increases in federal spending over 10 years that ranged from $24.7 trillion to $34.7 trillion.
Current outlays in fiscal 2018 are estimated to finish up at $4.137 trillion, to which add the average increase from BernieCare of $2.97 trillion, an increase of nearly 72% to outlays, and you've got nothing short of a draconian tax increase needed to pay for it all.