This value set includes codes based on the following rules:
http://snomed.info/sct
where concept is-a 394733009 (Medical specialties)urn:iso:std:iso:3166
http://unstats.un.org/unsd/methods/m49/m49.htm
where class = regionhttp://snomed.info/sct
where concept is-a 387961004 (Kingdom Animalia)http://nucc.org/provider-taxonomy