ParticipationStatus

This code system http://hl7.org/fhir/participationstatus defines the following codes:

Code	Display	Definition
accepted	Accepted	The participant has accepted the appointment.
declined	Declined	The participant has declined the appointment and will not participate in the appointment.
tentative	Tentative	The participant has tentatively accepted the appointment. This could be automatically created by a system and requires further processing before it can be accepted. There is no commitment that attendance will occur.
needs-action	Needs Action	The participant needs to indicate if they accept the appointment by changing this status to one of the other statuses.