Do specialists need a valid referral to claim referred services for every private patient they bill?

Context

I am a rehabilitation specialist working in a private hospital doing Day Rehab (patients are inpatients as they are admitted for the day). Usually, I see patients on the day they attend therapy (inpatient) however sometimes it is necessary to see them on another day (outpatient). I have access to their inpatient notes, but often there is not a formal referral (e.g., discharge summary states ‘For Day Rehab’). I have read a source that seems to suggest I don’t need a formal referral if I am billing them privately. However, I have read elsewhere that I need a valid referral for every patient (signed, dated, by a specialist or GP etc.). Which is correct?

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