CT/MRI Stryker Protocol

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Aetna and other insurance company's Medical Directors are insisting we get 77021 for MRI and 77001 for CT authorized for Pre-op guidance planning. I have been advising our physician's that these codes do not stand alone and are navigational tools DURING a procedure whether it be interventional or otherwise. Am I correct in this? I told the departments 70552 and 70160 respectively are more appropriate because our Radiologists are reading the imaging studies. Any input or assistance with this is greatly appreciated!:mad: