This case-insensitive code system http://hl7.org/fhir/us/bser/CodeSystem/TaskBusinessStatusCS defines the following codes:

Code	Display
2.0	Service Request Created
3.0	Service Request Accepted
4.0	Service Request Declined
5.2	Service Request Cancellation Requested
5.1.1	Serivce Request Event Scheduled
6.0	Service Request Fulfillment Cancelled
7.0	Service Request Fulfillment Completed
5.1.2	Scheduled Service Request Event Unattended
5.1.3	Scheduled Service Request Event Cancelled
5.1.4	Service Request Event Completed