This value set includes codes based on the following rules:

• Include these codes as defined in http://snomed.info/sct version http://snomed.info/sct/731000124108/version/20200901

  Code	Display
  257562009	Airport/airplane
  413817003	Child care facility
  257656006	Correctional facility
  473085002	Cruise ship or vessel travel as passenger or crew member
  257698009	School/university
  285141008	Workplace

• Include these codes as defined in urn:oid:2.16.840.1.114222.4.5.274 version 20200526

  Code	Display
  PHC2266	Animal with confirmed or suspected COVID-19
  PHC2267	Contact with a known COVID-19 case (probable or confirmed)

• Include these codes as defined in http://terminology.hl7.org/CodeSystem/umls version 20200813

  Code	Display
  C3826521	Adult congregate living facility
  C1880391	Domestic travel (outside state of normal residence)
  C1512888	International travel
  C3841750	Community event/mass gathering

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

  Code	Display
  OTH	Other (specify)
  UNK	Unknown exposures in the 14 days prior to illness onset