Frequencies for icdvers variable in icd2ccesrd21xw2012 dataset :

ICD Version |      Freq.     Percent        Cum.
------------+-----------------------------------
          9 |      3,172      100.00      100.00
------------+-----------------------------------
      Total |      3,172      100.00

by Jean Roth , jroth@nber.org , 12 Jan 2016