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The FHIR AllergyIntolerance base resource has example bindings to SNOMED CT for the element AllergyIntolerance.code as well as elements reaction.substance, reaction.manifestation, and reaction.exposureRoute. All example value sets are though very broad and likely not very precise in determining the set of relevant concepts, see table below. For each data element, the number of concepts that are in the Global Patient Set (GPS) is shown here. The GPS is a special SNOMED CT subset that can be used globally with minimal restriction and at no cost.

Since the SNOMED CT value sets in this category usually include a large number of concepts, implementers often ask for lists of most frequently used concepts to facilitate implementation (e.g., building picklists to assist data entry). These frequently-used subsets are sometimes called “starter sets”. Examples of starter sets are:

Qualifier and/or modifier value sets

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It was assessed that there was a good match between the HL7 required value set and the SNOMED CT << 272141005 |Severities (qualifier value)| subhierarchy.

AllergyIntolerance.Type

The group's suggested approach here is to use concepts taken from <<609433001 |Hypersensitivity disposition (finding)|unless an actual immune mediated hypersensitivity has been proven e.g., by testing. See section 6.1.1 Allergy list for a further discussion of the rationale behind this approach.

For other required value sets in the FHIR AllergyIntolerance resource there were issues ranging from some concepts in the FHIR value set lacked a corresponding SNOMED CT concept to differences in the underlying ontology making mapping complicated and likely less useful. For more details about mapping FHIR value sets to SNOMED CT, refer to the discussion of the SNOMED on FHIR Workgroup.[8]

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