| FHIR Infrastructure Work Group | Maturity Level: N/A | Standards Status: Informative | 
| Extensions: | |
| request-statusReason | statusReason :  Captures the reason for the current state of the resource.  | 
| request-doNotPerform | doNotPerform :  If true indicates that the request is asking for the specified action to not occur.  | 
| request-insurance | insurance :  Insurance plans, coverage extensions, pre-authorizations and/or pre-determinations that may be relevant in delivering the requested service.  | 
| request-relevantHistory | relevantHistory :  Links to Provenance records for past versions of this resource or fulfilling request or event resources that identify key state transitions or updates that are likely to be relevant to a user looking at the current version of the resource.  | 
| request-replaces | replaces :  Completed or terminated request(s) whose function is taken by this new request.  | 
| request-performerOrder | performerOrder :  Identifies the relative preference of alternative performers when the request lists multiple performers.  |