Hello! We are an independent lab running lcms(80307) and definitive(G0480-G0483) billing for urine collected at the facility the patient is receiving care from and sent to us. United Healthcare (UHC) just started denying our claims for box 24B and box 32. We have always billed with POS 81 in box 24B but they are now denying saying "The place of service for an independent laboratory must show the place where the sample was taken; based on the information provided on the HCFA 1500 box 24B and box 32 and the medical records submitted, we are unable to verify where the sample was obtained."
This is only happening with UHC. All the other commercial carriers have no issue paying our claims after the review of medical records.
Is anyone familiar with this change? Are they correct? and will other payers be moving to this rule?

Any guidance is very much appreciated.