• Include these codes as defined in http://hl7.org/fhir/issue-type version 4.0.1

  Code	Display	Definition
  invalid	Invalid Content	Content invalid against the specification or a profile.
  required	Required element missing	A required element is missing.
  invariant	Validation rule failed	A content validation rule failed - e.g. a schematron rule.
  login	Login Required	The client needs to initiate an authentication process.
  expired	Session Expired	User session expired; a login may be required.
  suppressed	Information Suppressed	Some information was not or might not have been returned due to business rules, consent or privacy rules, or access permission constraints. This information may be accessible through alternate processes.
  not-supported	Content not supported	The interaction, operation, resource or profile is not supported.
  multiple-matches	Multiple Matches	Multiple matching records were found when the operation required only one match.
  deleted	Deleted	The reference pointed to content (usually a resource) that has been deleted.
  code-invalid	Invalid Code	The code or system could not be understood, or it was not valid in the context of a particular ValueSet.code.
  too-costly	Operation Too Costly	The operation was stopped to protect server resources; e.g. a request for a value set expansion on all of SNOMED CT.
  conflict	Edit Version Conflict	Content could not be accepted because of an edit conflict (i.e. version aware updates). (In a pure RESTful environment, this would be an HTTP 409 error, but this code may be used where the conflict is discovered further into the application architecture.).
  lock-error	Lock Error	A resource/record locking failure (usually in an underlying database).
  exception	Exception	An unexpected internal error has occurred.
  incomplete	Incomplete Results	Not all data sources typically accessed could be reached or responded in time, so the returned information might not be complete (applies to search interactions and some operations).
  informational	Informational Note	A message unrelated to the processing success of the completed operation (examples of the latter include things like reminders of password expiry, system maintenance times, etc.).
  unknown	Unknown User	The user or system was not able to be authenticated (either there is no process, or the proferred token is unacceptable).

This value set expansion contains 17 concepts.