From https://github.com/hl7dk/dk-core/blob/b2a5c9e04840ceadcf2d1902280465509db7295d/input/fsh/codeSystems.fsh#L434 - we'll have to look at https://www.iso.org/obp/ui/#iso:code:3166:DK in 2026 as the migration of regions has effect from January 1st '27 - https://da.wikipedia.org/wiki/Region_%C3%98stdanmark
