Frequencies for mdcdesc variable in drg2010 dataset :

        Major Diagnostic Category (MDC) |
                            Description |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                                        |        252       25.23       25.23
0: PRINCIPAL DX CAN NOT BE ASSIGNED T.. |         25        2.50       27.73
10: ENDOCRINE, NUTRITIONAL & METABOLI.. |         26        2.60       30.33
11: DISEASES & DISORDERS OF THE KIDNE.. |         43        4.30       34.63
12: DISEASES & DISORDERS OF THE MALE .. |         21        2.10       36.74
13: DISEASES & DISORDERS OF THE FEMAL.. |         25        2.50       39.24
14: PREGNANCY, CHILDBIRTH & THE PUERP.. |         15        1.50       40.74
15: NEWBORNS & OTHER NEONATES WITH CO.. |          7        0.70       41.44
16: DISEASES & DISORDERS OF BLOOD, BL.. |         15        1.50       42.94
17: MYELOPROLIFERATIVE DISEASES & DIS.. |         27        2.70       45.65
18: INFECTIOUS & PARASITIC DISEASES, .. |         17        1.70       47.35
        19: MENTAL DISEASES & DISORDERS |          9        0.90       48.25
1: DISEASES & DISORDERS OF THE NERVOU.. |         75        7.51       55.76
20: ALCOHOL/DRUG USE & ALCOHOL/DRUG I.. |          4        0.40       56.16
21: INJURIES, POISONINGS & TOXIC EFFE.. |         20        2.00       58.16
                              22: BURNS |          6        0.60       58.76
23: FACTORS INFLUENCING HLTH STAT & O.. |         10        1.00       59.76
        24: MULTIPLE SIGNIFICANT TRAUMA |          8        0.80       60.56
25: HUMAN IMMUNODEFICIENCY VIRUS INFE.. |          6        0.60       61.16
     2: DISEASES & DISORDERS OF THE EYE |         10        1.00       62.16
3: DISEASES & DISORDERS OF THE EAR, N.. |         25        2.50       64.66
4: DISEASES & DISORDERS OF THE RESPIR.. |         40        4.00       68.67
5: DISEASES & DISORDERS OF THE CIRCUL.. |         88        8.81       77.48
6: DISEASES & DISORDERS OF THE DIGEST.. |         61        6.11       83.58
7: DISEASES & DISORDERS OF THE HEPATO.. |         36        3.60       87.19
8: DISEASES & DISORDERS OF THE MUSCUL.. |         99        9.91       97.10
9: DISEASES & DISORDERS OF THE SKIN, .. |         29        2.90      100.00
----------------------------------------+-----------------------------------
                                  Total |        999      100.00

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