Frequencies for mdcdesc variable in drg2006 dataset :

        Major Diagnostic Category (MDC) |
                            Description |      Freq.     Percent        Cum.
----------------------------------------+-----------------------------------
                                        |         41        7.33        7.33
0: PRINCIPAL DX CAN NOT BE ASSIGNED T.. |         14        2.50        9.84
10: ENDOCRINE, NUTRITIONAL & METABOLI.. |         17        3.04       12.88
11: DISEASES & DISORDERS OF THE KIDNE.. |         32        5.72       18.60
12: DISEASES & DISORDERS OF THE MALE .. |         19        3.40       22.00
13: DISEASES & DISORDERS OF THE FEMAL.. |         17        3.04       25.04
14: PREGNANCY, CHILDBIRTH & THE PUERP.. |         15        2.68       27.73
15: NEWBORNS & OTHER NEONATES WITH CO.. |          7        1.25       28.98
16: DISEASES & DISORDERS OF BLOOD, BL.. |          8        1.43       30.41
17: MYELOPROLIFERATIVE DISEASES & DIS.. |         18        3.22       33.63
18: INFECTIOUS & PARASITIC DISEASES, .. |          7        1.25       34.88
        19: MENTAL DISEASES & DISORDERS |          9        1.61       36.49
1: DISEASES & DISORDERS OF THE NERVOU.. |         40        7.16       43.65
20: ALCOHOL/DRUG USE & ALCOHOL/DRUG I.. |          4        0.72       44.36
21: INJURIES, POISONINGS & TOXIC EFFE.. |         17        3.04       47.41
                              22: BURNS |          8        1.43       48.84
23: FACTORS INFLUENCING HLTH STAT & O.. |          7        1.25       50.09
        24: MULTIPLE SIGNIFICANT TRAUMA |          4        0.72       50.81
25: HUMAN IMMUNODEFICIENCY VIRUS INFE.. |          3        0.54       51.34
     2: DISEASES & DISORDERS OF THE EYE |         13        2.33       53.67
3: DISEASES & DISORDERS OF THE EAR, N.. |         31        5.55       59.21
4: DISEASES & DISORDERS OF THE RESPIR.. |         28        5.01       64.22
5: DISEASES & DISORDERS OF THE CIRCUL.. |         55        9.84       74.06
6: DISEASES & DISORDERS OF THE DIGEST.. |         38        6.80       80.86
7: DISEASES & DISORDERS OF THE HEPATO.. |         20        3.58       84.44
8: DISEASES & DISORDERS OF THE MUSCUL.. |         59       10.55       94.99
9: DISEASES & DISORDERS OF THE SKIN, .. |         28        5.01      100.00
----------------------------------------+-----------------------------------
                                  Total |        559      100.00

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