Physician did blood work that wasn’t covered by my insurance without my consent

Went to the physician to get my yearly physical exam and blood tests which is supposed to be 100% covered by my insurance. I called ahead to confirm that the exam would be 100% covered by my insurance and was told it would be and there didn’t seem to be any issue. A few weeks later I get a bill in the mail for $50 for the remainder of bill that my insurance didn’t cover. So I called my insurance and they said they conducted some blood tests that were no longer covered under my insurance and didn’t tell me and there’s really nothing they can do on their end.

I called the physicians office and the clerk basically said that they knew that some of the blood work they did wasn’t covered but they did it anyway because “that’s just what they do for physical exams”. Nobody informed me prior that part of the tests wouldn’t be covered and I wasn’t given the choice to opt out, the clerk said the manager would review the claim and call me back but is there anything I can do?

I’m completely new to healthcare so I don’t really understand what’s going on