Frequencies for mdcdesc variable in drg2001 dataset :

        Major Diagnostic Category (MDC) |
                            Description |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                                        |         17        3.33        3.33
0: PRINCIPAL DX CAN NOT BE ASSIGNED T.. |         10        1.96        5.28
10: ENDOCRINE, NUTRITIONAL & METABOLI.. |         17        3.33        8.61
11: DISEASES & DISORDERS OF THE KIDNE.. |         32        6.26       14.87
12: DISEASES & DISORDERS OF THE MALE .. |         19        3.72       18.59
13: DISEASES & DISORDERS OF THE FEMAL.. |         17        3.33       21.92
14: PREGNANCY, CHILDBIRTH & THE PUERP.. |         15        2.94       24.85
15: NEWBORNS & OTHER NEONATES WITH CO.. |          7        1.37       26.22
16: DISEASES & DISORDERS OF BLOOD, BL.. |          8        1.57       27.79
17: MYELOPROLIFERATIVE DISEASES & DIS.. |         17        3.33       31.12
18: INFECTIOUS & PARASITIC DISEASES, .. |          9        1.76       32.88
        19: MENTAL DISEASES & DISORDERS |          9        1.76       34.64
1: DISEASES & DISORDERS OF THE NERVOU.. |         35        6.85       41.49
20: ALCOHOL/DRUG USE & ALCOHOL/DRUG I.. |          1        0.20       41.68
21: INJURIES, POISONINGS & TOXIC EFFE.. |         17        3.33       45.01
                              22: BURNS |          8        1.57       46.58
23: FACTORS INFLUENCING HLTH STAT & O.. |          7        1.37       47.95
        24: MULTIPLE SIGNIFICANT TRAUMA |          4        0.78       48.73
25: HUMAN IMMUNODEFICIENCY VIRUS INFE.. |          3        0.59       49.32
     2: DISEASES & DISORDERS OF THE EYE |         13        2.54       51.86
3: DISEASES & DISORDERS OF THE EAR, N.. |         31        6.07       57.93
4: DISEASES & DISORDERS OF THE RESPIR.. |         29        5.68       63.60
5: DISEASES & DISORDERS OF THE CIRCUL.. |         44        8.61       72.21
6: DISEASES & DISORDERS OF THE DIGEST.. |         40        7.83       80.04
7: DISEASES & DISORDERS OF THE HEPATO.. |         20        3.91       83.95
8: DISEASES & DISORDERS OF THE MUSCUL.. |         54       10.57       94.52
9: DISEASES & DISORDERS OF THE SKIN, .. |         28        5.48      100.00
----------------------------------------+-----------------------------------
                                  Total |        511      100.00

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