The following is a list of the codes for MeSH. It is a product of the United States National Library of Medicine.

Source for content is here. (File "2006 MeSH Trees".)

• A - Anatomy
  • Wikipedia:MeSH A01 --- body regions (74 articles)
  • Wikipedia:MeSH A02 --- musculoskeletal system (213 articles)
  • Wikipedia:MeSH A03 --- digestive system (98 articles)
  • Wikipedia:MeSH A04 --- respiratory system (46 articles)
  • Wikipedia:MeSH A05 --- urogenital system (87 articles)
  • Wikipedia:MeSH A06 --- endocrine system
  • Wikipedia:MeSH A07 --- cardiovascular system
  • Wikipedia:MeSH A08 --- nervous system
  • Wikipedia:MeSH A09 --- sense organs
  • Wikipedia:MeSH A10 --- tissues
  • Wikipedia:MeSH A11 --- cells
  • Wikipedia:MeSH A12 --- fluids and secretions
  • Wikipedia:MeSH A13 --- animal structures
  • Wikipedia:MeSH A14 --- stomatognathic system
  • Wikipedia:MeSH A15 --- hemic and immune systems
  • Wikipedia:MeSH A16 --- embryonic structures
  • Wikipedia:MeSH A17 --- integumentary system

• B - Organisms
  • Wikipedia:MeSH B01 --- animals
  • Wikipedia:MeSH B02 --- algae
  • Wikipedia:MeSH B03 --- bacteria
  • Wikipedia:MeSH B04 --- viruses
  • Wikipedia:MeSH B05 --- fungi
  • Wikipedia:MeSH B06 --- plants
  • Wikipedia:MeSH B07 --- archaea
  • Wikipedia:MeSH B08 --- mesomycetozoea

• C - Diseases
  • Wikipedia:MeSH C01 --- bacterial infections and mycoses
  • Wikipedia:MeSH C02 --- virus diseases
  • Wikipedia:MeSH C03 --- parasitic diseases
  • Wikipedia:MeSH C04 --- neoplasms
  • Wikipedia:MeSH C05 --- musculoskeletal diseases
  • Wikipedia:MeSH C06 --- digestive system diseases
  • Wikipedia:MeSH C07 --- stomatognathic diseases
  • Wikipedia:MeSH C08 --- respiratory tract diseases
  • Wikipedia:MeSH C09 --- otorhinolaryngologic diseases
  • Wikipedia:MeSH C10 --- nervous system diseases
  • Wikipedia:MeSH C11 --- eye diseases
  • Wikipedia:MeSH C12 --- urologic and male genital diseases
  • Wikipedia:MeSH C13 --- female genital diseases and pregnancy complications
  • Wikipedia:MeSH C14 --- cardiovascular diseases
  • Wikipedia:MeSH C15 --- hemic and lymphatic diseases
  • Wikipedia:MeSH C16 --- congenital, hereditary, and neonatal diseases and abnormalities
  • Wikipedia:MeSH C17 --- skin and connective tissue diseases
  • Wikipedia:MeSH C18 --- nutritional and metabolic diseases
  • Wikipedia:MeSH C19 --- endocrine system diseases
  • Wikipedia:MeSH C20 --- immune system diseases
  • Wikipedia:MeSH C21 --- disorders of environmental origin
  • Wikipedia:MeSH C22 --- animal diseases
  • Wikipedia:MeSH C23 --- pathological conditions, signs and symptoms

• D - Chemicals and Drugs
  • Wikipedia:MeSH D01 --- inorganic chemicals
  • Wikipedia:MeSH D02 --- organic chemicals
  • Wikipedia:MeSH D03 --- heterocyclic compounds
  • Wikipedia:MeSH D04 --- polycyclic compounds
  • Wikipedia:MeSH D05 --- macromolecular substances
  • Wikipedia:MeSH D06 --- hormones, hormone substitutes, and hormone antagonists
  • Wikipedia:MeSH D07 --- none (enzymes and coenzymes)
  • Wikipedia:MeSH D08 --- enzymes and coenzymes (carbohydrates)
  • Wikipedia:MeSH D09 --- carbohydrates (lipids)
  • Wikipedia:MeSH D10 --- lipids (amino acids, peptides, and proteins)
  • Wikipedia:MeSH D11 --- none (nucleic acids, nucleotides, and nucleosides)
  • Wikipedia:MeSH D12/20 --- amino acids, peptides, and proteins (complex mixtures)
  • Wikipedia:MeSH D13/23 --- nucleic acids, nucleotides, and nucleosides (biological factors)
  • Wikipedia:MeSH D14/25 --- biomedical and dental materials
  • Wikipedia:MeSH D15/26 --- pharmaceutical preparations
  • Wikipedia:MeSH D16/27 --- chemical actions and uses
  • Wikipedia:MeSH D20 --- complex mixtures
  • Wikipedia:MeSH D23 --- biological factors

• E - Analytical, Diagnostic and Therapeutic Techniques and Equipment
  • Wikipedia:MeSH E01 --- diagnosis
  • Wikipedia:MeSH E02 --- therapeutics
  • Wikipedia:MeSH E03 --- anesthesia and analgesia
  • Wikipedia:MeSH E04 --- surgical procedures, operative
  • Wikipedia:MeSH E05 --- investigative techniques
  • Wikipedia:MeSH E06 --- dentistry
  • Wikipedia:MeSH E07 --- equipment and supplies

• F - Psychiatry and Psychology
  • Wikipedia:MeSH F01 --- behavior and behavior mechanisms
  • Wikipedia:MeSH F02 --- psychological phenomena and processes
  • Wikipedia:MeSH F03 --- mental disorders
  • Wikipedia:MeSH F04 --- behavioral disciplines and activities

• G - Biological Sciences
  • Wikipedia:MeSH G01 --- biological sciences
  • Wikipedia:MeSH G02 --- health occupations
  • Wikipedia:MeSH G03 --- environment and public health
  • Wikipedia:MeSH G04 --- biological phenomena, cell phenomena, and immunity
  • Wikipedia:MeSH G05 --- genetic processes
  • Wikipedia:MeSH G06 --- biochemical phenomena, metabolism, and nutrition
  • Wikipedia:MeSH G07 --- physiological processes
  • Wikipedia:MeSH G08 --- reproductive and urinary physiology
  • Wikipedia:MeSH G09 --- circulatory and respiratory physiology
  • Wikipedia:MeSH G10 --- digestive, oral, and skin physiology
  • Wikipedia:MeSH G11 --- musculoskeletal, neural, and ocular physiology
  • Wikipedia:MeSH G12 --- chemical and pharmacologic phenomena
  • Wikipedia:MeSH G13 --- genetic phenomena
  • Wikipedia:MeSH G14 --- genetic structures

• H - Physical Sciences
  • Wikipedia:MeSH H01 --- natural sciences

• I - Anthropology, Education, Sociology and Social Phenomena
  • Wikipedia:MeSH I01 --- social sciences
  • Wikipedia:MeSH I02 --- education
  • Wikipedia:MeSH I03 --- human activities

• J - Technology and Food and Beverages
  • Wikipedia:MeSH J01 --- technology, industry, and agriculture
  • Wikipedia:MeSH J02 --- food and beverages

• K - Humanities
  • Wikipedia:MeSH K01 --- humanities

• L - Information Science
  • Wikipedia:MeSH L01 --- information science

• M - Persons
  • Wikipedia:MeSH M01 --- persons

• N - Health Care
  • Wikipedia:MeSH N01 --- population characteristics
  • Wikipedia:MeSH N02 --- health care facilities, manpower, and services
  • Wikipedia:MeSH N03 --- health care economics and organizations
  • Wikipedia:MeSH N04 --- health services administration
  • Wikipedia:MeSH N05 --- health care quality, access, and evaluation

• V - Publication Characteristics
  • Wikipedia:MeSH V01 --- publication components (publication type)
  • Wikipedia:MeSH V02 --- publication formats (publication type)
  • Wikipedia:MeSH V03 --- study characteristics (publication type)
  • Wikipedia:MeSH V04 --- support of research

• Z - Geographic Locations
  • Wikipedia:MeSH Z01 --- geographic locations