Who should check health insurance coverage and whether the procedures are approved?

Illinois (United States and all, perhaps), which is responsible for checking the health insurance coverage (if the doctor is on the network) and procedures done if (echo, Stress Tests, blood samples etc) are covered? If the patient or the doctor's office? Should not cope with business professionals, Insurance is done by professionals in the office doctor, rather than the patient who sometimes do not understand half of how the health system works?

This is your health and your bank account that will be affected, so you should be monitoring the coverage and approval process. You do not understand how the health system must be able to make only one service representative insurance, or human resources representative if procedures are covered and how.

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