is a colonoscopy covered?

Hello,  I'm a retired AT&T employee.... ID # -, Group # 

I'm in need of a colonoscopy.  I called BCBS of Ill and was told my 5 year test is covered yet the colonoscopy place says I need to pay $800 plus $600 as my colonoscopy is 'diagnosis' vs 'routine' because I had polyps removed 5 years ago.  My wife had the same scenario and paid >$100 in 2022.   I need to know why Gastrologist office is not labeling my procedure as 'routine' vs 'diagnosistic'.  Seems like a routine colonoscopy from my view.  

If I am out of pocket $1,400 for diagnostic.......Can I go to a new place for a 'routine' colonoscopy to lessen my out of pocket?

thanks!  Tim 

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