description: This profile on Identifier represents the Accession Number for the Imaging Order.\n\nWithin a Hospital Information System environment, accession numbers will **usually** uniquely identify a manifest or report but are not required to **always** map 1:1 with a report or manifest due to certain imaging workflows. The imaging report may not be uniquely identified by accession number in an overread scenario (two radiologists reading a single imaging study). The manifest may not be uniquely identified by accession number in the case that the RIS imaging request (accession number assigner) requires two imaging modalities to perform the exam, and thus produces two image manifests.\n\nIn order to ensure uniqueness **across** Hospital Information Systems, accession numbers are required to have a system value that identifies the namespace for the issuing authority (ensuring their global uniqueness).
package_name: hl7.fhir.eu.imaging
derivation: constraint
name: AccessionNumberIdentifierEuImaging
type: Identifier
elements:
  type:
    index: 0
    elements:
      coding:
        index: 1
        slicing:
          rules: open
          ordered: false
          discriminator:
          - {path: $this, type: value}
          min: 1
          slices:
            v2-0203-coding:
              match: {code: ACSN, system: 'http://terminology.hl7.org/CodeSystem/v2-0203'}
              schema:
                pattern:
                  type: Coding
                  value: {code: ACSN, system: 'http://terminology.hl7.org/CodeSystem/v2-0203'}
                _required: true
                index: 2
              min: 1
              max: 1
            dcm:
              match: {code: '121022', system: 'http://dicom.nema.org/resources/ontology/DCM', display: Accession Number}
              schema:
                pattern:
                  type: Coding
                  value: {code: '121022', system: 'http://dicom.nema.org/resources/ontology/DCM', display: Accession Number}
                index: 3
              min: 0
              max: 1
    required: [coding]
  system: {index: 4}
  value: {index: 5}
package_version: 1.0.0-ballot
class: complex-type
kind: complex-type
url: http://hl7.eu/fhir/imaging/StructureDefinition/AccessionNumberIdentifierEuImaging
base: http://hl7.org/fhir/StructureDefinition/Identifier
version: 1.0.0-ballot
required: [value, type, system]