We had some interesting discussions in openEHR Sweden today, including with @mikael . We looked at URI examples like If I remember correctly ( @mikael , @Ann-Sofie.Stolperud and other meeting participants, please help me rememeber ) some findings were: Thanks to the smart construction of SNOMED CT’s numerical identifiers it is possible to figure out from the number (and a lookup table) what module some concept code comes from, but usually hard/impossible to figure out from what verison of it. For medico-legal reasons (and some research reasons) you always want to be able to know e.g.