I'm not an expert in this area, but Medicare often does cover some or all surgical costs if a procedure is deemed to be necessary and "functional". That means, if the procedure is necessary for some medical reason (e.g. Your bite will wear your teeth out, cause some other problem, is causing migranes etc) you MAY be covered partially or completely by Medicare. If the procedure is purely cosmetic, then Medicare will not pay for any of it.
Regardless of whether it is cosmetic or functional, depending on your private health insurer - you might get back some or all of the hospital & theatre fees. To find out definitively, talk to your dentist and get a referral to a maxillofacial or oral surgeon who can perform the procedure. It very much depends on your specific medical condition.
Typically there is also some paperwork to do before your surgery as well, outlining your medical condition to prove that you *need* the surgery and why. Better to make sure everything is in order first before ... more.
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