US Core supports the minimal structure from which implementers and other US Realm projects can derive and build out for their use cases.   US Core can add additional elements based on future USCDI requirements or community consensus and demonstrate extensive existing use in implementations. Will add this bullet to the implementer guidance to refer the reader to Occupational Data for Health (ODH) FHIR IG  for more advanced Occupation detail. Implementers may consider referring to   Occupational Data for Health (ODH) FHIR IG   to convey additional details; data elements, such as Employer; or different topics, such as Usual (Longest-Held) Work.