Frequencies for first 10,000 rows of episode variable in nhamcsed2014 dataset :

Episode of care |      Freq.     Percent        Cum.
----------------+-----------------------------------
          Blank |         54        0.54        0.54
        Unknown |        488        4.88        5.42
  Initial visit |      8,906       89.06       94.48
Follow-up visit |        552        5.52      100.00
----------------+-----------------------------------
          Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 11 Apr 2017