Medication Administration resource covers the administration of all medications and vaccines. It will principally be used within care settings (including inpatient) to record the capture of medication administrations, including self-administrations of oral medications, injections, intra-venous adjustments, etc. It can also be used in outpatient settings to record allergy shots and other non-immunization administrations. In some cases, it might be used for home-health reporting, such as recording self-administered or even device-administered insulin.
MedicationAdministration is intended for tracking the administration of non-vaccine medications. Administration of vaccines is intended to be handled using the Immunization resource. Some systems treat immunizations in the same way as any other medication administration. Such systems should use an immunization resource to represent these. If systems need to use a MedicationAdministration resource to capture vaccinations for workflow or other reasons, they should also create and expose an equivalent Immunization instance.