Major Diagnostic Category (MDC) Code
T-MSIS Analytic Files (TAF) Claims Research Identifiable Files (RIFs), CCW Codebook, V1, November 2019
000 = Ungroupable 
001 = Nervous System 
002 = Eye 
003 = Ear, Nose, Mouth, And Throat 
004 = Respiratory System 
005 = Circulatory System 
006 = Digestive System 
007 = Hepatobiliary System and Pancreas 
008 = Musculoskeletal System and Connective Tissue 
009 = Skin, Subcutaneous Tissue, and Breast 
010 = Endocrine, Nutritional, and Metabolic System 
011 = Kidney and Urinary Tract 
012 = Male Reproductive System  
013 = Female Reproductive System 
014 = Pregnancy, Childbirth, and Puerperium 
015 = Newborn and Other Neonates (Perinatal Period) 
016 = Blood and Blood Forming Organs and Immunological Disorders 
017 = Myeloproliferative Diseases and Disorders (Poorly Differentiated Neoplasms) 
018 = Infectious and Parasitic Diseases and Disorders
019 = Mental Diseases and Disorders 
020 = Alcohol/Drug Use or Induced Mental Disorders  
021 = Injuries, Poison, and Toxic Effect of Drugs
022 = Burns 
023 = Factors Influencing Health Status 
024 = Multiple Significant Trauma 
025 = Human Immunodeficiency Virus (HIV) Infection 
Null/missing = source value is missing or unknown