Frequencies for mdcdesc variable in drg2013 dataset :

        Major Diagnostic Category (MDC) |
                            Description |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                                        |        248       24.82       24.82
0: PRINCIPAL DX CAN NOT BE ASSIGNED T.. |         26        2.60       27.43
10: ENDOCRINE, NUTRITIONAL & METABOLI.. |         26        2.60       30.03
11: DISEASES & DISORDERS OF THE KIDNE.. |         43        4.30       34.33
12: DISEASES & DISORDERS OF THE MALE .. |         21        2.10       36.44
13: DISEASES & DISORDERS OF THE FEMAL.. |         25        2.50       38.94
14: PREGNANCY, CHILDBIRTH & THE PUERP.. |         15        1.50       40.44
15: NEWBORNS & OTHER NEONATES WITH CO.. |          7        0.70       41.14
16: DISEASES & DISORDERS OF BLOOD, BL.. |         15        1.50       42.64
17: MYELOPROLIFERATIVE DISEASES & DIS.. |         27        2.70       45.35
18: INFECTIOUS & PARASITIC DISEASES, .. |         17        1.70       47.05
        19: MENTAL DISEASES & DISORDERS |          9        0.90       47.95
1: DISEASES & DISORDERS OF THE NERVOU.. |         75        7.51       55.46
20: ALCOHOL/DRUG USE & ALCOHOL/DRUG I.. |          4        0.40       55.86
21: INJURIES, POISONINGS & TOXIC EFFE.. |         20        2.00       57.86
                              22: BURNS |          6        0.60       58.46
23: FACTORS INFLUENCING HLTH STAT & O.. |         10        1.00       59.46
        24: MULTIPLE SIGNIFICANT TRAUMA |          8        0.80       60.26
25: HUMAN IMMUNODEFICIENCY VIRUS INFE.. |          6        0.60       60.86
     2: DISEASES & DISORDERS OF THE EYE |         10        1.00       61.86
3: DISEASES & DISORDERS OF THE EAR, N.. |         25        2.50       64.36
4: DISEASES & DISORDERS OF THE RESPIR.. |         40        4.00       68.37
5: DISEASES & DISORDERS OF THE CIRCUL.. |         88        8.81       77.18
6: DISEASES & DISORDERS OF THE DIGEST.. |         61        6.11       83.28
7: DISEASES & DISORDERS OF THE HEPATO.. |         36        3.60       86.89
8: DISEASES & DISORDERS OF THE MUSCUL.. |         99        9.91       96.80
9: DISEASES & DISORDERS OF THE SKIN, .. |         32        3.20      100.00
----------------------------------------+-----------------------------------
                                  Total |        999      100.00

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