| A - Anatomy 
 
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| | A02 - Musculoskeletal System A04 - Respiratory System
 A07 - Cardiovascular System
 A08 - Nervous System
 A09 - Sense Organs
 A10 - Tissues
 A11 - Cells
 A14 - Stomatognathic System
 A15 - Hemic and Immune Systems
 
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| B - Organisms 
 
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| | B01 - Animals B02 - Algae
 B03 - Bacteria
 B05 - Fungi
 B06 - Plants
 B07 - Archaea
 
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| C - Diseases 
 
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| | C01 - Bacterial Infections and Mycoses C04 - Neoplasms
 C05 - Musculoskeletal Diseases
 C06 - Digestive System Diseases
 C07 - Stomatognathic Diseases
 C08 - Respiratory Tract Diseases
 C09 - Otorhinolaryngologic Diseases
 C10 - Nervous System Diseases
 C11 - Eye Diseases
 C13 - Female Urogenital Diseases and Pregnancy Complications
 C14 - Cardiovascular Diseases
 C15 - Hemic and Lymphatic Diseases
 C16 - Congenital, Hereditary, and Neonatal Diseases and Abnormalities
 C17 - Skin and Connective Tissue Diseases
 C18 - Nutritional and Metabolic Diseases
 C20 - Immune System Diseases
 C22 - Animal Diseases
 C23 - Pathological Conditions, Signs and Symptoms
 
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| D - Chemicals and Drugs 
 
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| | D02 - Organic Chemicals D03 - Heterocyclic Compounds
 D08 - Enzymes and Coenzymes
 D09 - Carbohydrates
 D10 - Lipids
 D12 - Amino Acids, Peptides, and Proteins
 D20 - Complex Mixtures
 D23 - Biological Factors
 D26 - Pharmaceutical Preparations
 D27 - Chemical Actions and Uses
 
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| E - Analytical, Diagnostic and Therapeutic Techniques and Equipment 
 
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| | E01 - Diagnosis E02 - Therapeutics
 E03 - Anesthesia and Analgesia
 E04 - Surgical Procedures, Operative
 E05 - Investigative Techniques
 E06 - Dentistry
 E07 - Equipment and Supplies
 
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| F - Psychiatry and Psychology 
 
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| | F01 - Behavior and Behavior Mechanisms F02 - Psychological Phenomena and Processes
 F04 - Behavioral Disciplines and Activities
 
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| G - Phenomena and Processes 
 
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| | G01 - Physical Phenomena G02 - Chemical Phenomena
 G03 - Metabolic Phenomena
 G04 - Cell Physiological Phenomena
 G05 - Genetic Phenomena
 G06 - Microbiological Phenomena
 G07 - Physiological Phenomena
 G08 - Reproductive and Urinary Physiological Phenomena
 G10 - Digestive System and Oral Physiological Phenomena
 G11 - Musculoskeletal and Neural Physiological Phenomena
 G12 - Immune System Phenomena
 G13 - Integumentary System Physiological Phenomena
 G14 - Ocular Physiological Phenomena
 G15 - Plant Physiological Phenomena
 G16 - Biological Phenomena
 G17 - Mathematical Concepts
 
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| H - Disciplines and Occupations 
 
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| | H01 - Natural Science Disciplines H02 - Health Occupations
 
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| HP - Homeopathy 
 
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| | HP3 - Homeopathic Therapeutics 
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| I - Anthropology, Education, Sociology and Social Phenomena 
 
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| | I01 - Social Sciences I03 - Human Activities
 
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| J - Technology, Industry, Agriculture 
 
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| | J01 - Technology, Industry, and Agriculture 
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| K - Humanities 
 
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| L - Information Science 
 
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| | L01 - Information Science 
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| M - Persons 
 
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| N - Health Care 
 
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| | N02 - Health Care Facilities, Manpower, and Services N03 - Health Care Economics and Organizations
 N04 - Health Services Administration
 N05 - Health Care Quality, Access, and Evaluation
 N06 - Environment and Public Health
 
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| SP - Public Health 
 
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| | SP2 - Health Care (Public Health) SP4 - Environmental Health
 SP8 - Disasters
 
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| V - Publication Characteristics 
 
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| | V02 - Publication Formats 
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| VS - Health Surveillance 
 
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| | VS2 - Health Surveillance of Products 
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| Z - Geographicals 
 
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| | Z01 - Geographic Locations 
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