But it is a problem because I have source data in string text form = “intranasal influenza vaccine” and the FDA BEST is looking at specific drug_concept_ids, so 99.999% of the nasal influenza immunizations persons receive at our facilities are not picked up by their query. I have mapped our source string to 40213327, influenza nasal, unspecified formulation. However, my theory is that I would be able to map this data to a more granular concept_id IF the concept_ids had the valid start date & valid end date equal to the time that the drug was on the market because I have the drug_exposure date in my data. AND I do know that my theory may not work if these brand name intranasal influenza vaccines are on the market for more than one flu season. Yes, I can go out to RxNav to view this information, but I believe it should be an attribute of the “branded” drug concepts.