| A - Anatomy 
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| A02 - Musculoskeletal System 
 A10 - Tissues
 
 A05 - Urogenital System
 
 A18 - Plant Structures
 
 A13 - Animal Structures
 
 
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| B - Organisms 
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| B04 - Viruses 
 B01 - Eukaryota
 
 
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| C - Diseases 
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| C04 - Neoplasms 
 C10 - Nervous System Diseases
 
 C23 - Pathological Conditions, Signs and Symptoms
 
 
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| D - Chemicals and Drugs 
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| D12 - Amino Acids, Peptides, and Proteins 
 D03 - Heterocyclic Compounds
 
 D02 - Organic Chemicals
 
 D26 - Pharmaceutical Preparations
 
 D23 - Biological Factors
 
 D08 - Enzymes and Coenzymes
 
 
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| E - Analytical, Diagnostic and Therapeutic Techniques and Equipment 
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| E03 - Anesthesia and Analgesia 
 E06 - Dentistry
 
 E02 - Therapeutics
 
 E05 - Investigative Techniques
 
 
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| F - Psychiatry and Psychology 
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| F03 - Mental Disorders 
 F04 - Behavioral Disciplines and Activities
 
 
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| G - Phenomena and Processes 
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| G16 - Biological Phenomena 
 G04 - Cell Physiological Phenomena
 
 G17 - Mathematical Concepts
 
 G07 - Physiological Phenomena
 
 
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| H - Disciplines and Occupations 
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| H02 - Health Occupations 
 
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| HP - Homeopathy 
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| HP4 - Materia Medica 
 
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| I - Anthropology, Education, Sociology and Social Phenomena 
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| I01 - Social Sciences 
 
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| J - Technology, Industry, Agriculture 
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| J01 - Technology, Industry, and Agriculture 
 J02 - Food and Beverages
 
 
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| L - Information Science 
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| L01 - Information Science 
 
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| M - Named Groups 
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| M01 - Persons 
 
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| N - Health Care 
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| N06 - Environment and Public Health 
 N02 - Health Care Facilities, Manpower, and Services
 
 N01 - Population Characteristics
 
 N04 - Health Services Administration
 
 N05 - Health Care Quality, Access, and Evaluation
 
 
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| SP - Public Health 
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| SP8 - Disasters 
 SP1 - Health Policy, Planning and Management
 
 SP4 - Environmental Health
 
 SP5 - Epidemiology and Biostatistics
 
 SP2 - Health Care (Public Health)
 
 SP3 - Population Studies in Public Health
 
 SP6 - Nutrition, Public Health
 
 
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| VS - Health Surveillance 
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| VS2 - Health Surveillance of Products 
 VS3 - Health Surveillance of Health Services
 
 
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| Z - Geographicals 
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| Z01 - Geographic Locations 
 
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