This is the CodeSystem that contains codes in both ResearchSubjectStateType (http://terminology.hl7.org/CodeSystem/research-subject-state-type) and ResearchSubjectStateType (http://terminology.hl7.org/CodeSystem/research-subject-state-type).
This code system http://hl7.org/fhir/comparison/CodeSystem/5127f8b7-6ff3-42d1-85bd-471f7469a43a-1530 defines codes, but no codes are represented here
| Code | Display | Definition |
| Milestone | Milestone status | One of a set of milestone events that once they have occurred remain true thereafter. For example once a subject has reached the "Signed Informed Consent" milestone they achieve a status of "Consented" that will be true thereafter, even when they have left the study. For a subject a number of these states can be simulataneously true and should be recorded. |
| Enrollment | Enrollment status | This is a status that can only have a single value at a given point in time. The subject is either on-study or off-study. |