| A/B | Focus on Alcohol and Other Drugs (AOD) |
| A | AOD use, abuse, and dependence d-out qh ah | |
| B | AOD substance or product d-out qh ah |
| C/F | Natural science, biomedicine, and psychology |
| C | natural science d-out qh ah | |
| E | concepts in biomedical areas d-out qh ah | |
| F | concepts in psychology and thought d-out qh ah |
| G/J | Medicine and prevention |
| G | health and disease d-out qh ah | |
| HA | screening and diagnostic method d-out qh ah | |
| HJ | treatment method d-out qh ah | |
| J | prevention and treatment. health care d-out qh ah |
| L/O | Psychosocial and sociocultural areas and technology |
| L | social psychology and related concepts d-out qh ah | |
| M | social sciences, economics, and law d-out qh ah | |
| MW | religion, the humanities, and the arts d-out qh ah | |
| N | communication, information, and education d-out qh ah | |
| O | technology. safety and accidents d-out qh ah | |
| OZ | sports d-out qh ah |
| P/T | Concepts applicable across disciplines |
| PA | demography and epidemiology d-out qh ah | |
| PM | history, geography, and the environment d-out qh ah | |
| R | research method and research organization d-out qh ah | |
| S | field, discipline, or occupation d-out qh ah | |
| T | demographic characteristics d-out qh ah |
| V/Z | Lists of named entities |
| VA | place d-out qh ah | |
| VR | language d-out qh ah | |
| VZ | religious group d-out qh ah | |
| W | living organisms d-out qh ah | |
| X | body part d-out qh ah | |
| Y | chemical substances by function d-out qh ah | |
| Z | chemical substances by structure d-out qh ah |