affordable health care for all

I had an abdominal CT scan done recently, which took all of 15 minutes. I received a summary of the expense to my insurance and medicare of $4,457.30. I called my insurance to ask about this high price for a scan that only lasted 15 minutes and was told that it is at the discretion of health care institution for the charge. How can someone who has a high deductible or no insurance afford this? It disturbs me that health care is not affordable for all people.