I previously switched from Medibank 75% extra to Bupa 90% extra, and noticed that items on my treatment plan at the same clinic all raised. I.e. I'm getting less than 15% more covered due to the rise of quoted prices.
This year when I switch to another provider the price for the same item raised by another $200 making me annoyed.
A friend also told me he was attempted to charge $240 for an item once and since his insurance was out of limit he decided not to go through insurance and was only charged $120.
I feel so much intransparency in this process, an insurance provider can increase the quote of an item (and you have no way to know beforehand) that makes a higher-cover policy essentially cover less :(
Get quotes before you tell them you are insured. Then make them stick to the quotes.