_security

The standard search parameter _security is used to match resources based on security labels in the Resource.meta.security element.

Examples:

GET /fhir/Observation?_security=http://terminology.hl7.org/CodeSystem/v3-Confidentiality|R

GET /fhir/Observation?_security:not=http://terminology.hl7.org/CodeSystem/v3-Confidentiality|R