Advice with surprise balance billing

To make this short, I went in for a preventative procedure. Facility and doctor were in network with insurance. Before procedure they said they may or may not take a biopsy, and I told them if they do to make sure if it's in network. Well they took a biopsy and the lab they used were out of network. My insurance denied the lab claim for this reason and now I'm stuck with a over $2000 bill. I'm in Texas and I read that this kind of stuff falls under balance billing protection rules? Is this true what can I do in this situation?