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We’d previously added instantiatesCanonical and instantiatesUri to Immunization and ImmunizationRecommendation resources in R5 to point to the standard of care / source material referenced for administering / recommending that immunization
Current thinking is no longer to use “instantiates” elements and instead use standard extensions (e.g., "workflow-adheresTo”)
New proposal is to remove the “instantiates” elements and provide guidance to use the extensions for the same purpose
Proposal is add "supportingInformation" element to Immunization resource to capture relevant info that’s not specifically a reason to administer (indication), nor a reason not to administer (contraindication)
Other similar resources (e.g., MedicationAdministration) have this element already