I noticed that there are about 100 CPT4 codes where the mapping type is Drug, but the target vocabulary is 4 (CPT4). It seems to me that if we are going to create a drug exposure record due to the mapping type, the concept should be RxNorm. Note: all of these are vaccines.
Thanks for the input. We overhauled the entire CPT4 to RxNorm mapping. So, for each of the 100ish vaccines you should have a mapping to vocabulary_id=8 (RxNorm). The only problem we have is with influenza vaccine mappings, because they change every year, and therefore the mapping depends on the drug_exposure_start_date. We’ll add a paragraph in the vocabulary documentation to indicate how the ETL should work for those.