This code system https://hl7.fi/fhir/finnish-base-profiles/CodeSystem/fi-base-condition-category defines the following code:

Code	Display	Definition
reason-for-visit	Reason for visit	Indicates that this Condition is reason for visit (or treatment period). Reason for visit may be a diagnosis asserted by a clinician (a Diagnosis or Diagnoosi in finnish) or other healthcare professional (Käyntisyy in finnish).