The current recommendation for Allergy/Intolerance is to restrict terminology to RxNorm ingredient terms. The 2018 ONC Interoperability Standards Advisory (https://www.healthit.gov/isa/) recommends "When a medication allergy necessitates capture by medication class, SNOMED CT® should be used." Should QDM allow the use of SNOMED CT, most likely the product hierarchy for medication classes? Evaluation at the last QDM User Group (December 18) suggested that the product hierarchy would be appropriate. The SNOMED disorder category can be used to address items on a problem list as diagnoses (using the QDM datatype Diagnosis). But use of Diagnosis would not cause allergy checking so the Allergy/Intolerance QDM datatype should most likely use the SNOMED product category, if SNOMED is allowed.