We are adding an anesthesia group to our billing office that uses non-medically directed CRNAs. I have been billing for groups who direct their CRNA's and this are my first experience with non directed CRNAs. I have research the contracted insurance carriers and I know how they want these claims billed. My issue is with all the other carriers, which I would normally bill physician only with AA modifier, or no modifier when the CRNAs are directed. At the ASC the anesthesiologist is present in the facility at all times. Even though this group states they do not direct their CRNA's can I bill with the anesthesiologist name and NPI number? My concern is the non-contracted carriers might not agree to pay non-physician providers.