yes similar. The insurance company will deduct whatever the agreed amount is from the hospital bill and pay the balance. The amount the insurance don't pay you have to pay yourself.
The deductable is what you pay before Insurance coverage kicks in. eg, if the bill is 500,000 you pay 300,000 and insurance pays 200,000 (in the case of a 300,000 deductable).
Is done to make the policy premiums more affordable.
never has been health insurance or police check for Non O, only OA. 90 day Non O is easy to obtain but have read reports of people being unable to open a bank account on this visa.
Probably ok but not guaranteed. Only guaranteed way is to get a Non OA retirement visa before traveling. This visa has mandatory health insurance requirements so maybe that's why they are making difficulties for the 90 day non O.