| Code | Display | Definition |
| treatment | Treatment | One or more interventions are being evaluated for treating a disease, syndrome, or condition. |
| prevention | Prevention | One or more interventions are being assessed for preventing the development of a specific disease or health condition. |
| diagnostic | Diagnostic | One or more interventions are being evaluated for identifying a disease or health condition. |
| supportive-care | Supportive Care | One or more interventions are evaluated for maximizing comfort, minimizing side effects, or mitigating against a decline in the participant's health or function. |
| screening | Screening | One or more interventions are assessed or examined for identifying a condition, or risk factors for a condition, in people who are not yet known to have the condition or risk factor. |
| health-services-research | Health Services Research | One or more interventions for evaluating the delivery, processes, management, organization, or financing of healthcare. |
| basic-science | Basic Science | One or more interventions for examining the basic mechanism of action (for example, physiology or biomechanics of an intervention). |
| device-feasibility | Device Feasibility | An intervention of a device product is being evaluated to determine the feasibility of the product or to test a prototype device and not health outcomes. Such studies are conducted to confirm the design and operating specifications of a device before beginning a full clinical trial. |