Frequencies for first 10,000 rows of flags variable in icd9toicd10pcsgem dataset :

   All five |
      flags |      Freq.     Percent        Cum.
------------+-----------------------------------
      00000 |          7        0.07        0.07
      10000 |      9,439       94.39       94.46
      10111 |        220        2.20       96.66
      10112 |        138        1.38       98.04
      10113 |          5        0.05       98.09
      10114 |          3        0.03       98.12
      10121 |         76        0.76       98.88
      10122 |         40        0.40       99.28
      10123 |          8        0.08       99.36
      10131 |          7        0.07       99.43
      10132 |          7        0.07       99.50
      10133 |          6        0.06       99.56
      10141 |          4        0.04       99.60
      10142 |          4        0.04       99.64
      10143 |          6        0.06       99.70
      10144 |          6        0.06       99.76
      11000 |         24        0.24      100.00
------------+-----------------------------------
      Total |     10,000      100.00

by Jean Roth , jroth@nber.org , 11 May 2016