| A100 | Pre-clinical medicine |
| A200 | Pre-clinical dentistry |
| A300 | Clinical medicine |
| A400 | Clinical dentistry |
| A900 | Others in medicine and dentistry |
| B100 | Anatomy, physiology and pathology |
| B200 | Pharmacology, toxicology and pharmacy |
| B300 | Complementary medicine |
| B400 | Nutrition |
| B500 | Ophthalmics |
| B600 | Aural and oral sciences |
| B700 | Nursing |
| B800 | Medical technology |
| B900 | Others in subjects allied to medicine |
| C100 | Biology |
| C200 | Botany |
| C300 | Zoology |
| C400 | Genetics |
| C500 | Microbiology |
| C600 | Sports science |
| C700 | Molecular biology, biophysics and biochemistry |
| C800 | Psychology |
| C900 | Others in biological sciences |
| D100 | Pre-clinical veterinary medicine |
| D200 | Clinical veterinary medicine and dentistry |
| D300 | Animal science |
| D400 | Agriculture |
| D500 | Forestry |
| D600 | Food and beverage studies |
| D700 | Agricultural sciences |
| D900 | Others in veterinary sciences, agriculture and related subjects |
| F100 | Chemistry |
| F200 | Materials science |
| F300 | Physics |
| F400 | Forensic and archaeological science |
| F500 | Astronomy |
| F600 | Geology |
| F700 | Science of aquatic and terrestrial environments |
| F800 | Physical geographical sciences |
| F900 | Others in physical sciences |
| G100 | Mathematics |
| G200 | Operational research |
| G300 | Statistics |
| G400 | Computer science |
| G500 | Information systems |
| G600 | Software engineering |
| G700 | Artificial intelligence |
| G900 | Others in mathematical and computer sciences (any use of this code will not pass validation) |
| H100 | General engineering |
| H200 | Civil engineering |
| H300 | Mechanical engineering |
| H400 | Aerospace engineering |
| H500 | Naval architecture |
| H600 | Electronic and electrical engineering |
| H700 | Production and manufacturing engineering |
| H800 | Chemical, process and energy engineering |
| H900 | Others in engineering |
| J100 | Minerals technology |
| J200 | Metallurgy |
| J300 | Ceramics and glasses |
| J400 | Polymers and textiles |
| J500 | Materials technology not otherwise specified |
| J600 | Maritime technology |
| J700 | Biotechnology |
| J900 | Others in technology |
| K100 | Architecture |
| K200 | Building |
| K300 | Landscape design |
| K400 | Planning (urban, rural and regional) |
| K900 | Others in architecture, building and planning |
| L100 | Economics |
| L200 | Politics |
| L300 | Sociology |
| L400 | Social policy |
| L500 | Social work |
| L600 | Anthropology |
| L700 | Human and social geography |
| L900 | Others in social studies |
| M100 | Law by area |
| M200 | Law by topic |
| M900 | Other in law |
| N100 | Business studies |
| N200 | Management studies |
| N300 | Finance |
| N400 | Accounting |
| N500 | Marketing |
| N600 | Human resource management |
| N700 | Office skills |
| N800 | Hospitality, leisure, tourism and transport |
| N900 | Others in business and administrative studies |
| P100 | Information services |
| P200 | Publicity studies |
| P300 | Media studies |
| P400 | Publishing |
| P500 | Journalism |
| P900 | Others in mass communications and documentation |
| Q100 | Linguistics |
| Q200 | Comparative literary studies |
| Q300 | English studies |
| Q400 | Ancient language studies |
| Q500 | Celtic studies |
| Q600 | Latin studies |
| Q700 | Classical Greek studies |
| Q800 | Classical studies |
| Q900 | Others in linguistics, classics and related subjects |
| R100 | French studies |
| R200 | German studies |
| R300 | Italian studies |
| R400 | Spanish studies |
| R500 | Portuguese studies |
| R600 | Scandinavian studies |
| R700 | Russian and East European studies |
| R800 | European studies |
| R900 | Others in European languages, literature and related subjects |
| T100 | Chinese studies |
| T200 | Japanese studies |
| T300 | South Asian studies |
| T400 | Other Asian studies |
| T500 | African studies |
| T600 | Modern Middle Eastern studies |
| T700 | American studies |
| T800 | Australasian studies |
| T900 | Others in Eastern, Asiatic, African, American and Australasian languages, literature and related subjects |
| V100 | History by period |
| V200 | History by area |
| V300 | History by topic |
| V400 | Archaeology |
| V500 | Philosophy |
| V600 | Theology and religious studies |
| V900 | Others in historical and philosophical studies |
| W100 | Fine Art |
| W200 | Design studies |
| W300 | Music |
| W400 | Drama |
| W500 | Dance |
| W600 | Cinematics and photography |
| W700 | Crafts |
| W800 | Imaginative writing |
| W900 | Others in creative arts and design |
| X100 | Training teachers |
| X200 | Research and study skills in education |
| X300 | Academic studies in education |
| X900 | Others in education |