A 58-year-old patient with decreased hearing decided to undergo bilateral cochlear device implantation in order to restore the gradual decline of his hearing, and prevent total deafness. Due to the position of the device and the size of the patient’s mastoid bone that was partially occluding the patient’s inner ear, the physician performed a modified mastoidectomy. A mastoidectomy was necessary for the completion of the cochlear device implantation procedure. The physician used an operating microscope throughout the cochlear implantation. How would you code for the procedure?
