Sometimes it’s called pre-approval, pre-authorisation, or prior authorisation, but they all mean the same thing. Certain treatments require you to get prior approval by requiring you to submit a Pre-authorisation (Treatment Guarantee) Form in advance.
Following approval, cover for these required treatments or costs can then be guaranteed. You won't need to get Pre-authorisation for all the care you receive. It's mostly for in-patient and high cost treatments.