Frequencies for mdcdesc variable in drg2mdcxw2009 dataset :

        Major Diagnostic Category (MDC) |
                            Description |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
0: PRINCIPAL DX CAN NOT BE ASSIGNED T.. |         24        3.22        3.22
10: ENDOCRINE, NUTRITIONAL & METABOLI.. |         26        3.49        6.70
11: DISEASES & DISORDERS OF THE KIDNE.. |         43        5.76       12.47
12: DISEASES & DISORDERS OF THE MALE .. |         21        2.82       15.28
13: DISEASES & DISORDERS OF THE FEMAL.. |         25        3.35       18.63
14: PREGNANCY, CHILDBIRTH & THE PUERP.. |         15        2.01       20.64
15: NEWBORNS & OTHER NEONATES WITH CO.. |          7        0.94       21.58
16: DISEASES & DISORDERS OF BLOOD, BL.. |         15        2.01       23.59
17: MYELOPROLIFERATIVE DISEASES & DIS.. |         27        3.62       27.21
18: INFECTIOUS & PARASITIC DISEASES, .. |         17        2.28       29.49
        19: MENTAL DISEASES & DISORDERS |          9        1.21       30.70
1: DISEASES & DISORDERS OF THE NERVOU.. |         75       10.05       40.75
20: ALCOHOL/DRUG USE & ALCOHOL/DRUG I.. |          4        0.54       41.29
21: INJURIES, POISONINGS & TOXIC EFFE.. |         20        2.68       43.97
                              22: BURNS |          6        0.80       44.77
23: FACTORS INFLUENCING HLTH STAT & O.. |         10        1.34       46.11
        24: MULTIPLE SIGNIFICANT TRAUMA |          8        1.07       47.18
25: HUMAN IMMUNODEFICIENCY VIRUS INFE.. |          6        0.80       47.99
     2: DISEASES & DISORDERS OF THE EYE |         10        1.34       49.33
3: DISEASES & DISORDERS OF THE EAR, N.. |         25        3.35       52.68
4: DISEASES & DISORDERS OF THE RESPIR.. |         40        5.36       58.04
5: DISEASES & DISORDERS OF THE CIRCUL.. |         88       11.80       69.84
6: DISEASES & DISORDERS OF THE DIGEST.. |         61        8.18       78.02
7: DISEASES & DISORDERS OF THE HEPATO.. |         36        4.83       82.84
8: DISEASES & DISORDERS OF THE MUSCUL.. |         99       13.27       96.11
9: DISEASES & DISORDERS OF THE SKIN, .. |         29        3.89      100.00
----------------------------------------+-----------------------------------
                                  Total |        746      100.00

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