- An identifier intended for computation Base StructureDefinition for Identifier Type: A technical identifier - identifies some entity uniquely and unambiguously.
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Key: = Must support, = QICore-defined extension, = Is-Modifier
Field Card. Type and Description 
assigner 0..1ReferenceOrganization that issued/manages the identifier.period 0..1Interval<DateTime>Time period during which identifier is/was valid for use.system 0..1StringEstablishes the namespace for the value - that is, a URL that describes a set values that are unique.type 0..1ConceptA coded type for the identifier that can be used to determine which identifier to use for a specific purpose.Binding: Identifier Type Codes (Extensible)
use 0..1StringThe purpose of this identifier.Binding: IdentifierUse (Required)
value 0..1StringThe portion of the identifier typically relevant to the user and which is unique within the context of the system.Key: = Must support, = QICore-defined extension, = Is-Modifier
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