Details
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Change Request
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Resolution: Persuasive with Modification
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Low
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FHIR Core (FHIR)
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STU3
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FHIR Infrastructure
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Group
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Rick Geimer/Bryn Rhodes: 12-0-0
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Enhancement
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Non-substantive
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R5
Description
September 2019 Connectathon Evidence-Based Medicine Track evaluated changes requested to Group Resource to enable intended use of Evidence Resource. This change request was shared Wednesday Q2 to CDS/CQI/FHIR-I in-person meeting.
Groups defined with two or more characteristics are assumed to be defined as the intersection of these characteristics (charA AND charB). There is not a simple method to define the union of characteristics (charA OR charB). A use case example for the need for a union of characteristics is to define a group of adults as EITHER age > 18 years OR SNOMED-CT code for adults, where systems may provide one or the other type of data for such a characteristic.
The simple change request is to add a new element: Group.characteristicCombination with a cardinality 0..1, datatype code, and 2 choices for codes: intersection (to combine characteristics with 'AND'), union (to combine characteristics with 'OR')
GF#23724 suggests a new element to specify whether a group is fully defined by its characteristics. One could consider Group.characteristicCombination and Group.definedByCharacteristics to be inter-related concepts and use one element name and a code datatype with codes for multiple variants for how the characteristics are combined in the definition of the Group.