Frequencies for mdcdesc variable in drg2007 dataset :

        Major Diagnostic Category (MDC) |
                            Description |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                                        |        126       21.76       21.76
0: PRINCIPAL DX CAN NOT BE ASSIGNED T.. |         13        2.25       24.01
1: DISEASES & DISORDERS OF THE NERVOU.. |         75       12.95       36.96
     2: DISEASES & DISORDERS OF THE EYE |         10        1.73       38.69
3: DISEASES & DISORDERS OF THE EAR, N.. |         25        4.32       43.01
4: DISEASES & DISORDERS OF THE RESPIR.. |         40        6.91       49.91
5: DISEASES & DISORDERS OF THE CIRCUL.. |         87       15.03       64.94
6: DISEASES & DISORDERS OF THE DIGEST.. |         61       10.54       75.47
7: DISEASES & DISORDERS OF THE HEPATO.. |         36        6.22       81.69
8: DISEASES & DISORDERS OF THE MUSCUL.. |         99       17.10       98.79
9: DISEASES & DISORDERS OF THE SKIN, .. |          7        1.21      100.00
----------------------------------------+-----------------------------------
                                  Total |        579      100.00

by Jean Roth , jroth@nber.org , 22 Apr 2016