Major Diagnostic Categories (MDC)

There are 25 Major Diagnostic Categories (MDCs) . A case is assigned to one of the 25 major diagnostic categories, which are mutually exclusive groups based on principal diagnosis. Each MDC is organized into surgical and medical sections. The surgical section classifies all surgical conditions based upon operating room procedures. The Medical section classifies all diagnostic conditions based upon diagnosis codes. Both medical and surgical sections are organized by principles of anatomy, surgical approach, diagnostic approach, etiology, pathology and the treatment process.

MDC Categories

MDC 1 - Diseases and Disorders of the Nervous System
MDC 2 - Diseases and Disorders of the Eye
MDC 3 - Diseases and Disorders of the Ear, Nose, Mouth
MDC 4 - Diseases and Disorders of the Respiratory System
MDC 5 - Diseases and Disorders of the Circulatory System
MDC 6 - Diseases and Disorders of the Digestive System
MDC 7- Diseases and Disorders of the Hepatobiliary System and Pancreas
MDC 8 - Diseases and Disorders of the Musculoskeletal System And Connective Tissues
MDC 9 - Diseases and Disorders of the Skin, Subcutaneous Tissue and Breast
MDC 10 - Endocrine, Nutritional and Metabolic Diseases and Disorders
MDC 11 - Diseases and Disorders of the Kidney and Urinary Tract
MDC 12 - Diseases and Disorders of the Male Reproductive System
MDC 13 - Diseases and Disorders of the Female Reproductive System
MDC 14 - Pregnancy, Childbirth and the Puerperium
MDC 15 - Newborns and Other Neonates With Conditions Originating in the Perinatal Period
MDC 16 - Diseases and Disorders of the Blood and Blood-Forming Organs and Immunological Disorders
MDC 17 - Myeloproliferative Diseases and Disorders and Poorly Differentiated Neoplasms
MDC 18 - Infectious and Parasitic Diseases
MDC 19 - Mental Diseases and Disorders
MDC 20 - Alcohol/Drug Use and Alcohol/Drug-Induced Organic Mental Disorders
MDC 21 - Injury, Poisoning and Toxic Effects of Drugs
MDC 22 - Burns
MDC 23 - Factors Infleuncing Health Status and Other Contacts With Health Services
MDC 24 - Multiple Significant Trauma
MDC 25 - Human Immunodeficiency Virus Infections