I have a 55 year old patient who has Anthem for their insurance, he presented to us for a straight colonoscopy, with no findings. So we coded it 45378 with v76.51 as the diagnosis. Anthem is saying because it wasn't coded as a screening he has to pay co-insurance fee. Of course they won't tell you what codes are their screening codes, only will tell the patient we coded it wrong. So my question is, does anyone know another screening code.