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 17 = Myeloprolifeative DDs (Poorly Differentiated Neoplasm) 18 = Infectious and Parasitic DDs 19 = Mental Diseases and Disorders 20 = Alcohol/Drug Use or Induced Mental Disorders 21 = Injuries, Posion And Toxic Effect of Drugs 22 = Burns 23 = Factors Influencing Health Status 24 = Multiple Significant Trauma 25 = Human Immunodeficiency Virus Infections
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