What insurance is it? The denial code indicates that the insurance carrier does not recognize the provider as being able to perform that service. It may be that they don't allow PTs to do ultrasound, even if the PT is certified, or it may be that they don't have it indicated on their records that they are certified. Either way, you need to contact the insurance to find out if they do indeed allow a PT who is certified to be reimbursed for ultrasound.