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 20201204

  Code	Display
  PHC2288	Animal contact
  PHC2316	Similar illness contact
  PHC2315	Gardened or other work with soil

• Include these codes as defined in http://snomed.info/sct version http://snomed.info/sct/731000124108/version/20201209

  Code	Display
  412103003	Bone meal
  116517003	Fertilizer
  741063003	Illicit Drug Injectable
  307052004	Illicit Drug Non Injectable
  702869004	Participated in Incident Response
  261904005	Lab

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

  Code	Display
  OTH	Other
  UNK	Unknown