This code system http://terminology.hl7.org/CodeSystem/allergyintolerance-clinical defines the following codes:

LvlCodeDisplayDefinition
1active ActiveThe subject is currently experiencing, or is at risk of, a reaction to the identified substance.
1inactive InactiveThe subject is no longer at risk of a reaction to the identified substance.
2  resolved ResolvedA reaction to the identified substance has been clinically reassessed by testing or re-exposure and is considered no longer to be present. Re-exposure could be accidental, unplanned, or outside of any clinical setting.
<status value="draft"/> <experimental value="false"/> <date value="2023-02-25T11:07:30-07:00"/> <publisher value="FHIR Project team"/> <contact> <telecom> <system value="url"/> <value value="http://hl7.org/fhir"/> </telecom> </contact> <description value="Preferred value set for AllergyIntolerance Clinical Status."/> <caseSensitive value="true"/> <valueSet value="http://terminology.hl7.org/ValueSet/allergyintolerance-clinical"/> <content value="complete"/> <concept> <code value="active"/> <display value="Active"/> <definition value="The subject is currently experiencing, or is at risk of, a reaction to the identified substance."/> </concept> <concept> <code value="inactive"/> <display value="Inactive"/> <definition value="The subject is no longer at risk of a reaction to the identified substance."/> <concept> <code value="resolved"/> <display value="Resolved"/> <definition value="A reaction to the identified substance has been clinically reassessed by testing or re-exposure and is considered no longer to be present. Re-exposure could be accidental, unplanned, or outside of any clinical setting."/> </concept> </concept> </CodeSystem>