A: When magnetic resonance imaging (MRI) scans of the knee are performed and exported for prosthesis design and/or for the design of custom cutting jigs without a request for an interpretation, it would be appropriate for the entity that owns the equipment to report only the technical component of CPT code 73721, 73722, or 73723 (Magnetic Resonance Imaging, any joint of the lower extremity) based on whether or not contrast was administered. In this scenario, no professional component (PC) should be charged. If, however, an interpretation of the study is requested, and the medical necessity of the procedure is substantiated with an order from the referring physician, then the professional component of the appropriate CPT code (73721-73723) should be reported by the radiologist that renders the interpretation.