This code system https://fhir.hl7.org.uk/STU3/CodeSystem/CareConnect-ConditionCategory-1 defines the following codes:

CodeDisplayDefinition
problem-list-item Problem List ItemAn item on a problem list which can be managed over time and can be expressed by a practitioner (e.g. physician, nurse), patient, or related person.
encounter-diagnosis Encounter DiagnosisA point in time diagnosis (e.g. from a physician or nurse) in context of an encounter.
presenting-complaint Presenting Complaint
co-morbidity Co-morbidity
issue Issue