Where do out-of-pocket expenses come from?
Before we dive into the specific costs, it's worth understanding exactly why you sometimes have out-of-pocket expenses when you go to a privately owned healthcare facility, even if you have health insurance.
Say you visit a private hospital for treatment. You have gold level health insurance (the most comprehensive you can get).
Medicare will pay 75% of the Medicare Benefit Schedule (MBS) fee (yes that's right, despite being treated in the private system, Medicare still pays for the majority of your costs). Your private health insurance pays the remaining 25%.
However, in the private facilities, medical professionals are free to charge above the MBS fee. This is where out-of-pocket expenses can occur. Health insurance also doesn't always cover all of the services and treatments you'll access in hospital, such as pain medication dispensed on discharge or certain specialist appointments, such as seeing a paediatrician.

