This is the ValueSet that contains all the codes in CIED Patient Identifier (http://hl7.org/fhir/uv/cardx-cied/ValueSet/cied-patient-identifier) and CIED Patient Identifier (http://hl7.org/fhir/uv/cardx-cied/ValueSet/cied-patient-identifier). E.g. what you have to deal with if you get resources containing codes in either of them