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

• 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)

Other

• 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