In the Netherlands you will be treated regardless of your insurance and you are able to use any European Insurance. However, you may still be worried about the treatment cost.
If you have Dutch health insurance the price depends on your coverage and your so called “own risk” (eigen risico) (the amount you have to pay yourself per treatment). The lower your “own risk” is, the less expensive your medical bill will be and vice versa.
The bill for this treatment cost is always sent afterwards and it can take a long time before it gets to you. It is not unusual for your bill to be sent 6 months after treatment. There are different methods and conditions of payment available.