This is the ValueSet that contains codes in both US Public Health TriggerDefinition NamedEvent (http://hl7.org/fhir/us/medmorph/ValueSet/us-ph-triggerdefinition-namedevent) and US Public Health VaueSet - TriggerDefinition NamedEvent (http://hl7.org/fhir/us/ph-library/ValueSet/us-ph-valueset-triggerdefinition-namedevent).