API end point: https://fhir.careevolution.com/Master.Adapter1.WebClient/api/fhir-r4-strict.
https://fhir.careevolution.com/Master.Adapter1.WebClient/api/fhir-r4-strict
http://careevolution.com/fhirextensions#coverage-policyNumber
Insurance Policy Number
Used in Coverage resources
Type string