I am getting the same denials for the units being billed on drug screens w/G0431 QW. We do 9 total drug classes as well. MCR has advised us that the policy changed/updated on 7-1-10, but it's not "published" so they cannot tell us how many total units they will pay. We have billed for 6 and been paid, but all of our 9 units have denied with the CO-151 denial. Has anyone else billed for more than 6 since 7-1-10 and been paid? If so, how many units did you use?