This case-sensitive code system http://hl7.org/fhir/research-study-reason-stopped defines the following codes:
| Code | Display | Definition |
| accrual-goal-met | Accrual Goal Met | The study prematurely ended because the accrual goal was met. |
| closed-due-to-toxicity | Closed due to toxicity | The study prematurely ended due to toxicity. |
| closed-due-to-lack-of-study-progress | Closed due to lack of study progress | The study prematurely ended due to lack of study progress. |
| temporarily-closed-per-study-design | Temporarily closed per study design | The study prematurely ended temporarily per study design. |