This code system http://hl7.org/fhir/us/qicore/CodeSystem/condition-criticality defines the following codes:

CodeDisplayDefinition
unspecifiedNot SpecifiedThe criticality of the condition is not specified
self-resolvingExpected to Self-ResolveThe condition is expected to resolve on its own
controllableControllableThe condition is considered to be controllable
functional-lossPotential loss of function or capacityThe condition may result in partial or full loss of function or capacity
life-threateningLife ThreateningThe condition is considered to be life-threatening
requires-hospitalizationRequires HospitalizationThe condition requires hospitalization