A - Anatomy
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    A11 - Cells 
      
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B - Organisms
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    B01 - Eukaryota 
      
        
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C - Diseases
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    C04 - Neoplasms 
       C10 - Nervous System Diseases
  C25 - Substance-Related Disorders
  
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D - Chemicals and Drugs
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    D01 - Inorganic Chemicals 
       
      D02 - Organic Chemicals 
       
      D09 - Carbohydrates 
      
      D10 - Lipids 
       
      
       
      D12 - Amino Acids, Peptides, and Proteins 
      
      D20 - Complex Mixtures 
       
      
      D23 - Biological Factors 
       
       
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E - Analytical, Diagnostic and Therapeutic Techniques and Equipment
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    E02 - Therapeutics 
       E05 - Investigative Techniques 
       
    
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G - Phenomena and Processes
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    G16 - Biological Phenomena 
       
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I - Anthropology, Education, Sociology and Social Phenomena
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    I01 - Social Sciences 
      
       
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L - Information Science
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    L01 - Information Science 
       
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N - Health Care
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    N01 - Population Characteristics 
      
      N03 - Health Care Economics and Organizations 
       
       N06 - Environment and Public Health
  
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SP - Public Health
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    SP1 - Health Policy, Planning and Management 
      
       
      SP3 - Population Studies in Public Health 
      
       SP4 - Environmental Health
      
       SP5 - Epidemiology and Biostatistics
      
      SP8 - Disasters 
       
      
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