Frequencies for mdcdesc variable in drg2003 dataset :

        Major Diagnostic Category (MDC) |
                            Description |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                                        |         22        4.17        4.17
0: PRINCIPAL DX CAN NOT BE ASSIGNED T.. |         13        2.47        6.64
10: ENDOCRINE, NUTRITIONAL & METABOLI.. |         17        3.23        9.87
11: DISEASES & DISORDERS OF THE KIDNE.. |         32        6.07       15.94
12: DISEASES & DISORDERS OF THE MALE .. |         19        3.61       19.54
13: DISEASES & DISORDERS OF THE FEMAL.. |         17        3.23       22.77
14: PREGNANCY, CHILDBIRTH & THE PUERP.. |         15        2.85       25.62
15: NEWBORNS & OTHER NEONATES WITH CO.. |          7        1.33       26.94
16: DISEASES & DISORDERS OF BLOOD, BL.. |          8        1.52       28.46
17: MYELOPROLIFERATIVE DISEASES & DIS.. |         16        3.04       31.50
18: INFECTIOUS & PARASITIC DISEASES, .. |          9        1.71       33.21
        19: MENTAL DISEASES & DISORDERS |          9        1.71       34.91
1: DISEASES & DISORDERS OF THE NERVOU.. |         34        6.45       41.37
20: ALCOHOL/DRUG USE & ALCOHOL/DRUG I.. |          4        0.76       42.13
21: INJURIES, POISONINGS & TOXIC EFFE.. |         17        3.23       45.35
                              22: BURNS |          8        1.52       46.87
23: FACTORS INFLUENCING HLTH STAT & O.. |          7        1.33       48.20
        24: MULTIPLE SIGNIFICANT TRAUMA |          4        0.76       48.96
25: HUMAN IMMUNODEFICIENCY VIRUS INFE.. |          3        0.57       49.53
     2: DISEASES & DISORDERS OF THE EYE |         13        2.47       51.99
3: DISEASES & DISORDERS OF THE EAR, N.. |         31        5.88       57.87
4: DISEASES & DISORDERS OF THE RESPIR.. |         29        5.50       63.38
5: DISEASES & DISORDERS OF THE CIRCUL.. |         50        9.49       72.87
6: DISEASES & DISORDERS OF THE DIGEST.. |         40        7.59       80.46
7: DISEASES & DISORDERS OF THE HEPATO.. |         20        3.80       84.25
8: DISEASES & DISORDERS OF THE MUSCUL.. |         55       10.44       94.69
9: DISEASES & DISORDERS OF THE SKIN, .. |         28        5.31      100.00
----------------------------------------+-----------------------------------
                                  Total |        527      100.00

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