Frequencies for mdcdesc variable in drg2004 dataset :

        Major Diagnostic Category (MDC) |
                            Description |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                                        |         23        4.26        4.26
0: PRINCIPAL DX CAN NOT BE ASSIGNED T.. |         12        2.22        6.48
10: ENDOCRINE, NUTRITIONAL & METABOLI.. |         17        3.15        9.63
11: DISEASES & DISORDERS OF THE KIDNE.. |         32        5.93       15.56
12: DISEASES & DISORDERS OF THE MALE .. |         19        3.52       19.07
13: DISEASES & DISORDERS OF THE FEMAL.. |         17        3.15       22.22
14: PREGNANCY, CHILDBIRTH & THE PUERP.. |         15        2.78       25.00
15: NEWBORNS & OTHER NEONATES WITH CO.. |          7        1.30       26.30
16: DISEASES & DISORDERS OF BLOOD, BL.. |          8        1.48       27.78
17: MYELOPROLIFERATIVE DISEASES & DIS.. |         18        3.33       31.11
18: INFECTIOUS & PARASITIC DISEASES, .. |          9        1.67       32.78
        19: MENTAL DISEASES & DISORDERS |          9        1.67       34.44
1: DISEASES & DISORDERS OF THE NERVOU.. |         41        7.59       42.04
20: ALCOHOL/DRUG USE & ALCOHOL/DRUG I.. |          4        0.74       42.78
21: INJURIES, POISONINGS & TOXIC EFFE.. |         17        3.15       45.93
                              22: BURNS |          8        1.48       47.41
23: FACTORS INFLUENCING HLTH STAT & O.. |          7        1.30       48.70
        24: MULTIPLE SIGNIFICANT TRAUMA |          4        0.74       49.44
25: HUMAN IMMUNODEFICIENCY VIRUS INFE.. |          3        0.56       50.00
     2: DISEASES & DISORDERS OF THE EYE |         13        2.41       52.41
3: DISEASES & DISORDERS OF THE EAR, N.. |         31        5.74       58.15
4: DISEASES & DISORDERS OF THE RESPIR.. |         29        5.37       63.52
5: DISEASES & DISORDERS OF THE CIRCUL.. |         52        9.63       73.15
6: DISEASES & DISORDERS OF THE DIGEST.. |         40        7.41       80.56
7: DISEASES & DISORDERS OF THE HEPATO.. |         20        3.70       84.26
8: DISEASES & DISORDERS OF THE MUSCUL.. |         57       10.56       94.81
9: DISEASES & DISORDERS OF THE SKIN, .. |         28        5.19      100.00
----------------------------------------+-----------------------------------
                                  Total |        540      100.00

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