Hello Mitch,
Long time since I did this, but I think the first thing to do is ensure you are regiistered with the Health Insurance Commission (HIC) which gives you Medicare, Veteran's Affairs etc numbers. Dependent upon which State you are in, you will have to contact the WorkCover and TAC / Motor Accident Board to register with them. Check the websites. If you are not registered with the HIC then the bigger Insurance companies will not talk to you.
You may have to supply your AHPRA registration number and possibly your Physio Association number if you are a Member. You will require liability insurances etc and may have to provide policy details. The next tricky bit is the part where you will be registered for each address you operate from, and as you will be mobile there has to be a 'Head' office, mailing address etc. You can state that you will be visiting patients from your registered office as home visits, therefore charging out visits from that address.
I may be incorrect on the above requirements, but from memory that is how it used to work. The lack of a mobile Hiccaps is archaic, but so too is the need for some computer operating systems to use old versions of Browsers that have been updated four times just to use the Medicare PKI key to process EPC payments! I kid you not - this from the same Government that wishes to introduce E-Health.

Unless things have changed, some Health funds require you to sign up with them specifically, which is a pain, but a once off pain. Hicaps terminals seem to have eased this problem, unless you are mobile. You will need to make your own judgements with each fund as to whether you become a preferred provider (I choose NOT) buy getting less per consultation so that your patient receivesmore. As a Mobile therapist you may be locked out of the preferred provider network even if you wanted to join, as the network is based upon where you operate from ie a fixed address - to protect those already signed up in each region.

The whole thing is a complete mess, which is strange given so called competition policy as operated by the ACCC.

Hope this helps.
Cheers,
MrPhysio+ Mark Quittner