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The Major Diagnostic Categories (MDC) are formed by dividing all possible principal diagnoses (from ICD-9-CM) into 25 mutually exclusive diagnosis areas. The diagnoses in each MDC correspond to a single organ system or etiology and, in general, are associated with a particular medical specialty. MDC 1 to MDC 23 are grouped according to principal diagnoses. Patients are assigned to MDC 24 (Multiple Significant Trauma) with at least two significant trauma diagnosis codes (either as principal or secondaries) from different body site categories. Patients assigned to MDC 25 (HIV Infections) must have a principal diagnosis of an HIV Infection or a principal diagnosis of a significant HIV related condition and a secondary diagnosis of an HIV Infection.

MDC codes, like DRG codes, are primarily a claims and administrative data element unique to the United States medical care reimbursement system.

1Nervous System
3Ear, Nose, Mouth And Throat
4Respiratory System
5Circulatory System
6Digestive System
7Hepatobiliary System And Pancreas
8Musculoskeletal System And Connective Tissue
9Skin, Subcutaneous Tissue And Breast
10Endocrine, Nutritional And Metabolic System
11Kidney And Urinary Tract
12Male Reproductive System
13Female Reproductive System
14Pregnancy, Childbirth And Puerperium
15Newborn And Other Neonates (Perinatal Period)
16Blood and Blood Forming Organs and Immunological Disorders
17Myeloproliferative DDs (Poorly Differentiated Neoplasms)
18Infectious and Parasitic DDs
19Mental Diseases and Disorders
20Alcohol/Drug Use or Induced Mental Disorders
21Injuries, Poison And Toxic Effect of Drugs
23Factors Influencing Health Status
24Multiple Significant Trauma
25Human Immunodeficiency Virus Infection

External linksEdit

de:MDC es:Categoría Diagnóstica Mayor

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