Major Diagnostic Category

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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. MDC codes, like diagnosis-related group (DRG) codes, are primarily a claims and administrative data element unique to the United States medical care reimbursement system. DRG codes also are mapped, or grouped, into MDC codes.

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 0, unlike the others, can be reached from a number of diagnosis/procedure situations, all related to transplants. This is due to the expense involved for the transplants so designated and because these transplants can be needed for a number of reasons which do not all come from one diagnosis domain. DRGs which reach MDC 0 are assigned to the MDC for the principal diagnosis instead of to the MDC associated with the designated DRG.

List of Major Diagnostic Categories[edit]

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

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