| A1 (Body Regions) |
5 |
| A2 (Musculoskeletal System) |
1 |
| A5 (Urogenital System) |
2 |
| A7 (Cardiovascular System) |
1 |
| A8 (Nervous System) |
7 |
| A10 (Tissues) |
1 |
| A11 (Cells) |
17 |
| A13 (Animal Structures) |
3 |
| A15 (Hemic and Immune Systems) |
1 |
| A16 (Embryonic Structures) |
2 |
| B1 (Eukaryota) |
10 |
| B3 (Bacteria) |
14 |
| B4 (Viruses) |
1 |
| B5 (Organism Forms) |
1 |
| C1 (Bacterial Infections and Mycoses) |
15 |
| C2 (Virus Diseases) |
1 |
| C4 (Neoplasms) |
5 |
| C5 (Musculoskeletal Diseases) |
10 |
| C6 (Digestive System Diseases) |
1 |
| C7 (Stomatognathic Diseases) |
1 |
| C8 (Respiratory Tract Diseases) |
10 |
| C9 (Otorhinolaryngologic Diseases) |
8 |
| C10 (Nervous System Diseases) |
29 |
| C11 (Eye Diseases) |
6 |
| C12 (Male Urogenital Diseases) |
4 |
| C13 (Female Urogenital Diseases and Pregnancy Complications) |
7 |
| C14 (Cardiovascular Diseases) |
9 |
| C15 (Hemic and Lymphatic Diseases) |
2 |
| C16 (Congenital, Hereditary, and Neonatal Diseases and Abnormalities) |
6 |
| C17 (Skin and Connective Tissue Diseases) |
6 |
| C18 (Nutritional and Metabolic Diseases) |
1 |
| C19 (Endocrine System Diseases) |
1 |
| C20 (Immune System Diseases) |
3 |
| C23 (Pathological Conditions, Signs and Symptoms) |
27 |
| C24 (Occupational Diseases) |
1 |
| C25 (Substance-Related Disorders) |
1 |
| C26 (Wounds and Injuries) |
16 |
| D1 (Inorganic Chemicals) |
2 |
| D2 (Organic Chemicals) |
2 |
| D3 (Heterocyclic Compounds) |
4 |
| D4 (Polycyclic Compounds) |
2 |
| D5 (Macromolecular Substances) |
4 |
| D6 (Hormones, Hormone Substitutes, and Hormone Antagonists) |
9 |
| D8 (Enzymes and Coenzymes) |
8 |
| D12 (Amino Acids, Peptides, and Proteins) |
89 |
| D13 (Nucleic Acids, Nucleotides, and Nucleosides) |
3 |
| D20 (Complex Mixtures) |
6 |
| D23 (Biological Factors) |
44 |
| D26 (Pharmaceutical Preparations) |
2 |
| D27 (Chemical Actions and Uses) |
5 |
| E1 (Diagnosis) |
16 |
| E2 (Therapeutics) |
27 |
| E3 (Anesthesia and Analgesia) |
2 |
| E4 (Surgical Procedures, Operative) |
16 |
| E5 (Investigative Techniques) |
36 |
| E6 (Dentistry) |
5 |
| E7 (Equipment and Supplies) |
2 |
| F1 (Behavior and Behavior Mechanisms) |
10 |
| F2 (Psychological Phenomena and Processes) |
6 |
| F3 (Mental Disorders) |
4 |
| F4 (Behavioral Disciplines and Activities) |
2 |
| G1 (Physical Phenomena) |
14 |
| G2 (Chemical Phenomena) |
15 |
| G3 (Metabolic Phenomena) |
5 |
| G4 (Cell Physiological Phenomena) |
12 |
| G5 (Genetic Phenomena) |
27 |
| G6 (Microbiological Phenomena)? |
1 |
| G7 (Physiological Phenomena) |
5 |
| G8 (Reproductive and Urinary Physiological Phenomena) |
5 |
| G9 (Circulatory and Respiratory Physiological Phenomena)? |
3 |
| G11 (Musculoskeletal and Neural Physiological Phenomena) |
7 |
| G12 (Immune System Phenomena) |
4 |
| G15 (Plant Physiological Phenomena) |
3 |
| G16 (Biological Phenomena) |
8 |
| G17 (Mathematical Concepts) |
1 |
| H1 (Natural Science Disciplines) |
3 |
| I1 (Social Sciences) |
1 |
| I2 (Education) |
2 |
| I3 (Human Activities) |
1 |
| J1 (Technology, Industry, and Agriculture) |
11 |
| J2 (Food and Beverages) |
2 |
| K1 (Humanities) |
2 |
| L1 (Information Science) |
6 |
| M1 (Persons) |
8 |
| N1 (Population Characteristics) |
3 |
| N2 (Health Care Facilities, Manpower, and Services) |
8 |
| N3 (Health Care Economics and Organizations) |
1 |
| N4 (Health Services Administration)? |
2 |
| N5 (Health Care Quality, Access, and Evaluation) |
4 |
| N6 (Environment and Public Health) |
21 |
| Z1 (Geographic Locations) |
2 |