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I am seeing claims where lab draws and another service like an ultrasound are performed on the same day and Tricare denies all of the lab draws and pays off of the CPT code for the service performed. I was told appending an L1 modifier to the claim is correct to get Tricare to look at the lab charges. Is this correct? I thought L1 modifiers were only used when only lab charges were done that day but people may roll them into another charge like pre-op testing and a surgery. Please help, thanks!