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A long term solution most likely involves discussion with IHTSDO in order to determine their coverage of the code sets.
Secondly, we should consider SNOMED CT style representation, which is to say, 3 separate tables as described in the IHTSDO TIG section on RF2 . This approach would enable each separate vocabulary in openEHR to be managed as a small hierarchy of its own. In order to use actual SNOMED CT codes, we would need to obtain an openEHR Snomed Extension .