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Medical Classification/Coding

Medical classification systems are used for a variety of applications in medicine and medical informatics

  • Statistical analysis of diseases and therapeutic actions
  • Reimbursement e.g. Based on drgs
  • Knowledge-based and decision support systems
  • Direct surveillance of epidemic or pandemic outbreaks

Types of Cassification

  • Diagnostic codes
  • Procedural codes
  • Pharmaceutical codes
  • Topographical codes

List of Mdical Cassification Systems

Specialized for medicine

  • Part of WHO Family of International Classifications (WHO-FIC)

Reference Classifications

  • International Statistical Classification of Diseases and Related Health Problems (ICD)
  • International Classification of Functioning, Disability, and Health (ICF)
  • International Classification of Health Interventions (ICHI) - under development

Related Classifications

  • International Classification of Primary Care (ICPC-2)
  • International Classification of External Causes of Injury (ICECI)
  • Anatomical Therapeutic Chemical Classification System (ATC/DDD)
  • Technical aids for persons with disabilities: Classification and terminology (ISO9999)

Derived Classifications

  • International Classification of Diseases for Oncology, Third Edition (ICD-O-3)
  • ICD-10 for Mental and Behavioral Disorders
  • Application of the International Classification of Diseases to Dentistry and Stomatology, 3rd Edition (ICD-DA)
  • Application of the International Classification of Diseases to Neurology (ICD-10-NA)
  • International Classification of Functioning, Disability and Health for Children and Youth (ICF-CY)


  • ICD-10 Procedure Coding System (ICD-10-PCS)
  • Diagnostic and Statistical Manual of Mental Disorders (DSM)
  • Systematized Nomenclature of Medicine (SNOMED)
  • TNM Classification of Malignant Tumours
  • Medical Subject Headings (MeSH)
  • Unified Medical Language System (UMLS)
  • Mendelian Inheritance in Man (OMIM)
  • Current Procedural Terminology (CPT-4)
  • Health Care Procedure Coding System (HCPCS)
  • North American Nursing Diagnosis Association (NANDA)
  • Read Codes
  • Logical Observation Identifiers Names and Codes (LOINC)

Library classification that have medical components

  • Dewey Decimal System and Universal Decimal Classification (section 610-620)
  • Library of Congress Classification: Class R -- Medicine
  • National Library of Medicine classification



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