| Description | Code |
| General | 1000 |
| Agricultural and Biological Sciences (all) | 1100 |
| Agricultural and Biological Sciences (miscellaneous) | 1101 |
| Agronomy and Crop Science | 1102 |
| Animal Science and Zoology | 1103 |
| Aquatic Science | 1104 |
| Ecology, Evolution, Behavior and Systematics | 1105 |
| Food Science | 1106 |
| Forestry | 1107 |
| Horticulture | 1108 |
| Insect Science | 1109 |
| Plant Science | 1110 |
| Soil Science | 1111 |
| Arts and Humanities(all) | 1200 |
| Arts and Humanities (miscellaneous) | 1201 |
| History | 1202 |
| Language and Linguistics | 1203 |
| Archaeology | 1204 |
| Classics | 1205 |
| Conservation | 1206 |
| History and Philosophy of Science | 1207 |
| Literature and Literary Theory | 1208 |
| Museology | 1209 |
| Music | 1210 |
| Philosophy | 1211 |
| Religious studies | 1212 |
| Visual Arts and Performing Arts | 1213 |
| Biochemistry, Genetics and Molecular Biology(all) | 1300 |
| Biochemistry, Genetics and Molecular Biology (miscellaneous) | 1301 |
| Ageing | 1302 |
| Biochemistry | 1303 |
| Biophysics | 1304 |
| Biotechnology | 1305 |
| Cancer Research | 1306 |
| Cell Biology | 1307 |
| Clinical Biochemistry | 1308 |
| Developmental Biology | 1309 |
| Endocrinology | 1310 |
| Genetics | 1311 |
| Molecular Biology | 1312 |
| Molecular Medicine | 1313 |
| Physiology | 1314 |
| Structural Biology | 1315 |
| Business, Management and Accounting(all) | 1400 |
| Business, Management and Accounting (miscellaneous) | 1401 |
| Accounting | 1402 |
| Business and International Management | 1403 |
| Management Information Systems | 1404 |
| Management of Technology and Innovation | 1405 |
| Marketing | 1406 |
| Organizational Behavior and Human Resource Management | 1407 |
| Strategy and Management | 1408 |
| Tourism, Leisure and Hospitality Management | 1409 |
| Industrial relations | 1410 |
| Chemical Engineering(all) | 1500 |
| Chemical Engineering (miscellaneous) | 1501 |
| Bioengineering | 1502 |
| Catalysis | 1503 |
| Chemical Health and Safety | 1504 |
| Colloid and Surface Chemistry | 1505 |
| Filtration and Separation | 1506 |
| Fluid Flow and Transfer Processes | 1507 |
| Process Chemistry and Technology | 1508 |
| Chemistry(all) | 1600 |
| Chemistry (miscellaneous) | 1601 |
| Analytical Chemistry | 1602 |
| Electrochemistry | 1603 |
| Inorganic Chemistry | 1604 |
| Organic Chemistry | 1605 |
| Physical and Theoretical Chemistry | 1606 |
| Spectroscopy | 1607 |
| Computer Science (all) | 1700 |
| Computer Science (miscellaneous) | 1701 |
| Artificial Intelligence | 1702 |
| Computational Theory and Mathematics | 1703 |
| Computer Graphics and Computer-Aided Design | 1704 |
| Computer Networks and Communications | 1705 |
| Computer Science Applications | 1706 |
| Computer Vision and Pattern Recognition | 1707 |
| Hardware and Architecture | 1708 |
| Human-Computer Interaction | 1709 |
| Information Systems | 1710 |
| Signal Processing | 1711 |
| Software | 1712 |
| Decision Sciences(all) | 1800 |
| Decision Sciences (miscellaneous) | 1801 |
| Information Systems and Management | 1802 |
| Management Science and Operations Research | 1803 |
| Statistics, Probability and Uncertainty | 1804 |
| Earth and Planetary Sciences(all) | 1900 |
| Earth and Planetary Sciences (miscellaneous) | 1901 |
| Atmospheric Science | 1902 |
| Computers in Earth Sciences | 1903 |
| Earth-Surface Processes | 1904 |
| Economic Geology | 1905 |
| Geochemistry and Petrology | 1906 |
| Geology | 1907 |
| Geophysics | 1908 |
| Geotechnical Engineering and Engineering Geology | 1909 |
| Oceanography | 1910 |
| Palaeontology | 1911 |
| Space and Planetary Science | 1912 |
| Stratigraphy | 1913 |
| Economics, Econometrics and Finance(all) | 2000 |
| Economics, Econometrics and Finance (miscellaneous) | 2001 |
| Economics and Econometrics | 2002 |
| Finance | 2003 |
| Energy(all) | 2100 |
| Energy (miscellaneous) | 2101 |
| Energy Engineering and Power Technology | 2102 |
| Fuel Technology | 2103 |
| Nuclear Energy and Engineering | 2104 |
| Renewable Energy, Sustainability and the Environment | 2105 |
| Engineering(all) | 2200 |
| Engineering (miscellaneous) | 2201 |
| Aerospace Engineering | 2202 |
| Automotive Engineering | 2203 |
| Biomedical Engineering | 2204 |
| Civil and Structural Engineering | 2205 |
| Computational Mechanics | 2206 |
| Control and Systems Engineering | 2207 |
| Electrical and Electronic Engineering | 2208 |
| Industrial and Manufacturing Engineering | 2209 |
| Mechanical Engineering | 2210 |
| Mechanics of Materials | 2211 |
| Ocean Engineering | 2212 |
| Safety, Risk, Reliability and Quality | 2213 |
| Media Technology | 2214 |
| Building and Construction | 2215 |
| Architecture | 2216 |
| Environmental Science(all) | 2300 |
| Environmental Science (miscellaneous) | 2301 |
| Ecological Modelling | 2302 |
| Ecology | 2303 |
| Environmental Chemistry | 2304 |
| Environmental Engineering | 2305 |
| Global and Planetary Change | 2306 |
| Health, Toxicology and Mutagenesis | 2307 |
| Management, Monitoring, Policy and Law | 2308 |
| Nature and Landscape Conservation | 2309 |
| Pollution | 2310 |
| Waste Management and Disposal | 2311 |
| Water Science and Technology | 2312 |
| Immunology and Microbiology(all) | 2400 |
| Immunology and Microbiology (miscellaneous) | 2401 |
| Applied Microbiology and Biotechnology | 2402 |
| Immunology | 2403 |
| Microbiology | 2404 |
| Parasitology | 2405 |
| Virology | 2406 |
| Materials Science(all) | 2500 |
| Materials Science (miscellaneous) | 2501 |
| Biomaterials | 2502 |
| Ceramics and Composites | 2503 |
| Electronic, Optical and Magnetic Materials | 2504 |
| Materials Chemistry | 2505 |
| Metals and Alloys | 2506 |
| Polymers and Plastics | 2507 |
| Surfaces, Coatings and Films | 2508 |
| Mathematics (all) | 2600 |
| Mathematics (miscellaneous) | 2601 |
| Algebra and Number Theory | 2602 |
| Analysis | 2603 |
| Applied Mathematics | 2604 |
| Computational Mathematics | 2605 |
| Control and Optimization | 2606 |
| Discrete Mathematics and Combinatorics | 2607 |
| Geometry and Topology | 2608 |
| Logic | 2609 |
| Mathematical Physics | 2610 |
| Modelling and Simulation | 2611 |
| Numerical Analysis | 2612 |
| Statistics and Probability | 2613 |
| Theoretical Computer Science | 2614 |
| Medicine (all) | 2700 |
| Medicine (miscellaneous) | 2701 |
| Anatomy | 2702 |
| Anesthesiology and Pain Medicine | 2703 |
| Biochemistry, medical | 2704 |
| Cardiology and Cardiovascular Medicine | 2705 |
| Critical Care and Intensive Care Medicine | 2706 |
| Complementary and alternative medicine | 2707 |
| Dermatology | 2708 |
| Drug guides | 2709 |
| Embryology | 2710 |
| Emergency Medicine | 2711 |
| Endocrinology, Diabetes and Metabolism | 2712 |
| Epidemiology | 2713 |
| Family Practice | 2714 |
| Gastroenterology | 2715 |
| Genetics(clinical) | 2716 |
| Geriatrics and Gerontology | 2717 |
| Health Informatics | 2718 |
| Health Policy | 2719 |
| Hematology | 2720 |
| Hepatology | 2721 |
| Histology | 2722 |
| Immunology and Allergy | 2723 |
| Internal Medicine | 2724 |
| Infectious Diseases | 2725 |
| Microbiology (medical) | 2726 |
| Nephrology | 2727 |
| Clinical Neurology | 2728 |
| Obstetrics and Gynaecology | 2729 |
| Oncology | 2730 |
| Ophthalmology | 2731 |
| Orthopedics and Sports Medicine | 2732 |
| Otorhinolaryngology | 2733 |
| Pathology and Forensic Medicine | 2734 |
| Pediatrics, Perinatology, and Child Health | 2735 |
| Pharmacology (medical) | 2736 |
| Physiology (medical) | 2737 |
| Psychiatry and Mental health | 2738 |
| Public Health, Environmental and Occupational Health | 2739 |
| Pulmonary and Respiratory Medicine | 2740 |
| Radiology Nuclear Medicine and imaging | 2741 |
| Rehabilitation | 2742 |
| Reproductive Medicine | 2743 |
| Reviews and References, Medical | 2744 |
| Rheumatology | 2745 |
| Surgery | 2746 |
| Transplantation | 2747 |
| Urology | 2748 |
| Neuroscience(all) | 2800 |
| Neuroscience (miscellaneous) | 2801 |
| Behavioral Neuroscience | 2802 |
| Biological Psychiatry | 2803 |
| Cellular and Molecular Neuroscience | 2804 |
| Cognitive Neuroscience | 2805 |
| Developmental Neuroscience | 2806 |
| Endocrine and Autonomic Systems | 2807 |
| Neurology | 2808 |
| Sensory Systems | 2809 |
| Nursing(all) | 2900 |
| Nursing (miscellaneous) | 2901 |
| Advanced and Specialised Nursing | 2902 |
| Assessment and Diagnosis | 2903 |
| Care Planning | 2904 |
| Community and Home Care | 2905 |
| Critical Care | 2906 |
| Emergency | 2907 |
| Fundamentals and skills | 2908 |
| Gerontology | 2909 |
| Issues, ethics and legal aspects | 2910 |
| Leadership and Management | 2911 |
| LPN and LVN | 2912 |
| Maternity and Midwifery | 2913 |
| Medical–Surgical | 2914 |
| Nurse Assisting | 2915 |
| Nutrition and Dietetics | 2916 |
| Oncology(nursing) | 2917 |
| Pathophysiology | 2918 |
| Pediatrics | 2919 |
| Pharmacology (nursing) | 2920 |
| Phychiatric Mental Health | 2921 |
| Research and Theory | 2922 |
| Review and Exam Preparation | 2923 |
| Pharmacology, Toxicology and Pharmaceutics(all) | 3000 |
| Pharmacology, Toxicology and Pharmaceutics (miscellaneous) | 3001 |
| Drug Discovery | 3002 |
| Pharmaceutical Science | 3003 |
| Pharmacology | 3004 |
| Toxicology | 3005 |
| Physics and Astronomy(all) | 3100 |
| Physics and Astronomy (miscellaneous) | 3101 |
| Acoustics and Ultrasonics | 3102 |
| Astronomy and Astrophysics | 3103 |
| Condensed Matter Physics | 3104 |
| Instrumentation | 3105 |
| Nuclear and High Energy Physics | 3106 |
| Atomic and Molecular Physics, and Optics | 3107 |
| Radiation | 3108 |
| Statistical and Nonlinear Physics | 3109 |
| Surfaces and Interfaces | 3110 |
| Psychology(all) | 3200 |
| Psychology (miscellaneous) | 3201 |
| Applied Psychology | 3202 |
| Clinical Psychology | 3203 |
| Developmental and Educational Psychology | 3204 |
| Experimental and Cognitive Psychology | 3205 |
| Neuropsychology and Physiological Psychology | 3206 |
| Social Psychology | 3207 |
| Social Sciences(all) | 3300 |
| Social Sciences (miscellaneous) | 3301 |
| Archaeology | 3302 |
| Development | 3303 |
| Education | 3304 |
| Geography, Planning and Development | 3305 |
| Health(social science) | 3306 |
| Human Factors and Ergonomics | 3307 |
| Law | 3308 |
| Library and Information Sciences | 3309 |
| Linguistics and Language | 3310 |
| Safety Research | 3311 |
| Sociology and Political Science | 3312 |
| Transportation | 3313 |
| Anthropology | 3314 |
| Communication | 3315 |
| Cultural Studies | 3316 |
| Demography | 3317 |
| Gender Studies | 3318 |
| Life-span and Life-course Studies | 3319 |
| Political Science and International Relations | 3320 |
| Public Administration | 3321 |
| Urban Studies | 3322 |
| veterinary(all) | 3400 |
| veterinary (miscalleneous) | 3401 |
| Equine | 3402 |
| Food Animals | 3403 |
| Small Animals | 3404 |
| Dentistry(all) | 3500 |
| Dentistry (miscellaneous) | 3501 |
| Dental Assisting | 3502 |
| Dental Hygiene | 3503 |
| Oral Surgery | 3504 |
| Orthodontics | 3505 |
| Periodontics | 3506 |
| Health Professions(all) | 3600 |
| Health Professions (miscellaneous) | 3601 |
| Chiropractics | 3602 |
| Complementary and Manual Therapy | 3603 |
| Emergency Medical Services | 3604 |
| Health Information Management | 3605 |
| Medical Assisting and Transcription | 3606 |
| Medical Laboratory Technology | 3607 |
| Medical Terminology | 3608 |
| Occupational Therapy | 3609 |
| Optometry | 3610 |
| Pharmacy | 3611 |
| Physical Therapy, Sports Therapy and Rehabilitation | 3612 |
| Podiatry | 3613 |
| Radiological and Ultrasound Technology | 3614 |
| Respiratory Care | 3615 |
| Speech and Hearing | 3616 |
