This code system http://terminology.hl7.org/CodeSystem/need defines the following codes:

CodeDisplayDefinition
none None***TODO***
initial Initial***TODO***
periodic Periodic***TODO***
 <status value="draft"/> <experimental value="false"/> <date value="2018-06-05T14:06:02+00:00"/> <publisher value="HL7 (FHIR Project)"/> <contact> <telecom> <system value="url"/> <value value="http://hl7.org/fhir"/> </telecom> <telecom> <system value="email"/> <value value="fhir@lists.hl7.org"/> </telecom> </contact> <contact> <telecom> <system value="url"/> <value value="http://hl7.org/fhir"/> </telecom> <telecom> <system value="email"/> <value value="fhir@lists.hl7.org"/> </telecom> </contact> <description value="The frequency with which the target must be validated"/> <caseSensitive value="true"/> <valueSet value="http://terminology.hl7.org/ValueSet/verificationresult-need"/> <content value="complete"/> <concept> <code value="none"/> <display value="None"/> <definition value="***TODO***"/> </concept> <concept> <code value="initial"/> <display value="Initial"/> <definition value="***TODO***"/> </concept> <concept> <code value="periodic"/> <display value="Periodic"/> <definition value="***TODO***"/> </concept> </CodeSystem>