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I work for pain management who has an inside lab where we do urine drug screens and UDS confirmations. We have been having so many denials for these codes, and I'm not quite sure what the issue is. We usually will bill the OV 9924 25 modifier, 80307 usually with the Z79.899 code for the urine. Humana will not pay for any of the UDS/UDS confirmation, and a lot of the other payers are denying this as well. Unfortunately, we do not have a coder on staff to ask these kinds of questions so I am looking for any help you can offer. Should they be billed separately from the office visit? Thank you!