CARIN BB uses the ExplanationOfBenefit Resource as its primary resource.  Reference Resources are Coverage, Patient, Practitioner, PractitionerRole, Organization and Location.   Since the ExplanationOfBenefit and Coverage profiles are not included in the US Core, there is no alignment requirement for these profiles.  Patient, Practitioner, PractitionerRole, Organization and Location are US Core Profiles. Since these are supporting / reference profiles (rather than a focus profile) in CARIN BB, the alignment with the US Core is on the content of these profiles, but not on the search parameters.   The following diagram provides a high-level view of the relationships between resources used in this IG. It does not necessarily reflect all of the relationships/references between resources. The attached diagram will be added.