Yes it is "legal" and "ethical" for a healthcare provider to charge for services rendered. Health insurance policies differ so deductibles and the percentage your parents have to pay depends on what their particular health insurance provides. That is between them and their health insurance company. The healthcare provider is entitled to be paid and your parents would owe any money left after their health insurance policy pays what it is supposed to.
For what are they being charged They have to pay first $750 and then 20% thereafter. Some healthcare providers simply do not accept certain health insurance which is something which should be discussed up front.
Your question seems to be missing some information. Of course a health care provider can charge for services. You need to explain what happened and how it ties into the deductible.
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