Major Diagnostic Categories. The Major Diagnostic Categories (MDC) are formed by dividing all possible principal diagnoses into 25 mutually exclusive diagnosis area.
0 = Ungroupable
1 = Nervous System
2 = Eye
3 = Ear, Nose, Mouth and Throat
4 = Respiratory System
5 = Circulatory System
6 = Digestive System
7 = Hepatobiliary System And Pancreas
8 = Musculoskeletal System And Connective Tissue
9 = Skin, Subcutaneous Tissue And Breast
10 = Endocrine, Nutritional And Metabolic System
11 = Kidney and Urinary Tract
12 = Male Reproductive System
13 = Female Reproductive System
14 = Pregnancy, Childbirth and Puerperium
15 = Newborn and Other Neonates (Prenatal Period)
16 = Blood and Blood Forming Organs and Immunological Disorder
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