C-CDA on FHIR
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This page is part of the C-CDA on FHIR Implementation Guide (v1.2.0-ballot: STU 1 Ballot 4) based on FHIR R4. The current version which supercedes this version is 1.1.0. For a full list of available versions, see the Directory of published versions

FHIR to C-CDA Allergies

FHIR US Core → C-CDA Mapping

While multiple vendors participated in CDA → FHIR mappings at a connectathon, only a single vendor (Cerner/Oracle) has participated in the FHIR → CDA mapping. We welcome feedback on these mappings which represent less than a multi-vendor consensus at this time.


This page provides a mapping from FHIR to CDA. For the CDA to FHIR mapping, please refer to Allergies CDA → FHIR. For guidance on how to read the table below, see Reading the C-CDA ↔ FHIR Mapping Pages

FHIR to C-CDA

FHIR
AllergyIntolerance		 C-CDA¹
Allergy Intolerance observation		 Transform Steps
.identifier /id CDA id ↔ FHIR identifier
.clinicalStatus (act parent to observation) ../../statusCode
&
Allergy Status
observation/code@code="33999-4"
/entryRelationship/observation/value		 FHIR clinicalStatus → CDA Allergy Status Observation value
For more information on how status is managed in Allergy Concern Act wrapper, refer to C-CDA guidance, see 5.2.7.1
.type
&
.category		 /value FHIR type → CDA value
FHIR category → CDA value
.criticality Criticality
observation/code@code="82606-5"
/entryRelationship/observation/value		 CDA coding ↔ FHIR CodeableConcept
FHIR criticality → CDA Criticality value
.code /participant/participantRole/playingEntity/code Constraint: When FHIR concept is not a negated concept
CDA coding ↔ FHIR CodeableConcept
.code /participant/participantRole/playingEntity/code or /value
&
set @negationInd=”true”		 Constraint: When FHIR concept represents general negated concept (e.g. no known allergy)
FHIR code → CDA No Known Allergy
In case where a specific refutation is coded (no latex allergy), use text or a mapped concept.
.encounter entryRelationship@typeCode="REFR"
/entryRelationship/act/id		  
.onsetDateTime /effectiveTime/low CDA ↔ FHIR Time/Dates
.onsetPeriod.start /effectiveTime/low effectiveTime/high should not be mapped from onsetPeriod
.recordedDate /assignedAuthor/time These are not necessarily the same author
.recorder /assignedAuthor CDA ↔ FHIR Provenance
Time and author are not necessarily the same
Annotation
.note		 Comment Activity
entryRelationship/act/code@code="48767-8"
/entryRelationship/act/text		  
.reaction.id Reaction
entryRelationship@typeCode="MFST"
/entryRelationship/observation/id		  
reaction.manifestation /entryRelationship/observation/value Both use SNOMED clinical findings with minor valueSet definition differences
.reaction.onset /effectiveTime/low Constraint: This should only be used in event that AlleryIntolerance.onset was not available
.reaction.severity Severity
entryRelationship/observation@code="SEV"
/entryRelationship/observation/value		 FHIR severity → CDA severity value
This should be nested in CDA within the respective allergic reaction observation

1. XPath abbrievated for C-CDA Allergy Intolerance as:
ClinicalDocument/component/structuredBody/component/section[(@code="48765-2")]/entry/act/entryRelationship/observation

Illustrative example

Links to example content

Note that these mappings have only been implemented by a single vendor to date.

Prior work and Expanded Spreadsheets

As reviewed in the methodology, a more comprehensive review was performed via spreadsheets. These spreadsheets have been consolidated and further revised in the tables above but are provided for reference here