For both Encounter.indication and Encounter.hospitalization.dischargeDiagnosis, you've got Reference(Any). There's no reason to be this open. It's going to result in inconsistency. For discharge diagnosis, I don't think anything other than Observation and Condition makes sense and you ought to be able to limit to Condition. For indication, Condition, Observation are all that really make sense either. If you have a ReferralRequest, ProcedureRequest or DiagnosticRequest, those should be linked in "fulfils", not "indication".

As well, look at taking "reason" and "indication" and combining them into a choice unless you have strong use-cases for supporting both.