I'm not sure what type of Health Insurance you have.
I have BUPA Gold Cover with an excess of $250
Other than paying the excess only once a year, BUPA has paid all of my hospital admissions.
That is for Surgeries ie Mastectomy, Chemotherapy, Breast reconstruction surgeries.
The Gaps have come from the Drs and Surgeons. Other gaps come with Investigations, I now try to ask the Dr ordering the tests request to Bulk Bill.
I have been fortunate as my Surgeons have had a relatively low Gap charge.
In particular my Plastic Surgeon only Charged $1000 including 2 surgeries (8hr +2hrs) including all of the post op appointments. There were many appointments to drain seroma, and fill expanders.
I had Radiotherapy done through the Public system. If I had gone Private there would have been a $2000-$3000 gap even with my insurance. My R/T seemed excellent, and was scheduled ASAP as needed, referred from my Private Oncologist.
I have been very happy. Not much out of pocket at all.
If you have Chemo, ask if you can use the Cold Cap. If you do, you may not loose your hair. I can tell you more about this, if you want. It is often available Public and Private.