For those in the community wondering what the US does for ‘clinical modelling’, here is one effort that is currently running - USCDI, under the auspices of the US Gov ISA (Interoperability Standards Advisory).
It varies between the basic (what we would consider ‘reference model’) e.g. Encounter information, to various kinds of clinical notes, patient demographics, and a few clinical items (e.g. allergy/intolerance).
I would guess it has no more than about 5% of the structured data points of openEHR archetypes, but it’s always worth knowing how modelling is happening elsewhere.