FHIR Vocabulary binding for Authors

Unsorted rules

• if the type of the element is "code"
  • the value set should be defined as part of FHIR.
  • the binding strength should be required
  • codes should be mapped to v2 and/or v3 if equivalent concepts exist in v3

• If the type of the element is "coding" or "CodeableConcept"
  • the value set should not include codes defined as part of FHIR; the codes should be drawn from v2 tables or v3 code systems, or external vocabularies (anything listed here: http://hl7-fhir.github.io/terminologies-systems.html)
  • v3 value sets can be used if appropriate
  • the binding strength should be at the most required
  • LOINC value sets can at the most be preferred. SNOMED CT value sets can at the most be
  • mapping can be performed but is not required

notes:

• the rules differ depending on the underlying data type. The build tool won't let bindings cross data types
• the binding strength limitations for Coding/CodeableConcept do not apply to implementation guides (e.g. realm specific etc)
• for exemptions to these rules, consult MnM or Vocab for approval
• there are many legacy valuesets for Coding/CodeableConcept that are defined in FHIR itself, in violation of the above rule. Replacing these with external content is an ongoing task