This value set includes codes based on the following rules:

• Include these codes as defined in urn:oid:2.16.840.1.114222.4.5.274 version 20211027

  Code	Display
  PHC917	Airline/ship crew
  PHC386	Business
  PHC1310	Immigration
  PHC1501	Medical/relief response
  PHC64	Military
  PHC918	Missionary
  PHC2382	Routine land border crossing
  PHC920	Student/Teacher
  PHC2383	Temporary work
  PHC916	Visiting friends/relatives

• Include these codes as defined in http://snomed.info/sct version http://snomed.info/sct/731000124108/version/20210322

  Code	Display
  390790000	Asylum
  446654005	Refugee/Newcomer resettlement program
  769038007	Research

• Include these codes as defined in http://terminology.hl7.org/CodeSystem/umls version 20210608

  Code	Display
  C0175800	International adoption
  C3841750	Mass gathering
  C2718027	Medical tourism
  C0030733	Peace Corps
  C0683587	Tourism

• Include these codes as defined in http://terminology.hl7.org/CodeSystem/v3-NullFlavor version 20090501

  Code	Display
  OTH	Other travel purpose (specify)
  UNK	Unknown