This code system http://hl7.org/fhir/allergy-verification-status defines the following codes:

CodeDisplayDefinition
unconfirmedUnconfirmedA low level of certainty about the propensity for a reaction to the identified substance.
confirmedConfirmedA high level of certainty about the propensity for a reaction to the identified substance, which may include clinical evidence by testing or rechallenge.
refutedRefutedA propensity for a reaction to the identified substance has been disproven with a high level of clinical certainty, which may include testing or rechallenge, and is refuted.
entered-in-errorEntered In ErrorThe statement was entered in error and is not valid.

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