I am the biller in a very small practice and we have no coder. Our providers normally cover a 99497 (Advanced Care Plan) with patients during a G0438, but every once in a while it will come up during a regular office visit such as a 99214. When I bill out a G0438 and a 99497, I use modifier -33. One of our providers coded a 99497 with a 99214 and I also used modifier 33 but we are getting a denial from Humana. Can someone please tell me if I need to use a different modifier? I'm wondering if it should be 99214-25 and 99497? Your help would be greatly appreciated.