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 20201221

  Code	Display
  PHC1313	Foreign Visitor
  PHC1310	Immigrant
  PHC82	Lab evidence of previous disease
  PHC83	MD diagnosis of previous disease
  PHC1311	Missed opportunity in medical setting
  PHC94	Parent/Patient forgot to vaccinate
  PHC95	Parental/Patient Refusal
  PHC93	Parent/patient report of previous disease
  PHC1314	Parent/Patient unaware of recommendation
  PHC92	Philosophical objection
  PHC96	Religious exemption
  PHC1312	Too Young
  PHC1315	Vaccine record incomplete/unavailable

• Include these codes as defined in http://snomed.info/sct version http://snomed.info/sct/731000124108/version/20201211

  Code	Display
  397745006	Medical contraindication

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

  Code	Display
  OTH	Other
  UNK	unknown

• Include these codes as defined in http://terminology.hl7.org/CodeSystem/umls version 20201217

  Code	Display
  C4698055	Vaccine not available