CPT® Code 69729

Implantation, osseointegrated implant, skull; with magnetic transcutaneous attachment to external speech processor, outside of the mastoid and resulting in removal of greater than or equal to 100 sq mm surface area of bone deep to the outer cranial cortex

The procedure described by CPT® Code 69729 involves the implantation of an osseointegrated implant in the skull, specifically designed for patients requiring a bone conduction implant (BCI) system. This system utilizes an external hearing aid or speech processor that amplifies sound, which is then transmitted through the implant anchored to the skull. The sound vibrations are conducted via the bone directly to the cochlea, facilitating improved auditory perception for individuals with certain types of hearing loss. The unique aspect of this procedure is the use of a magnetic transcutaneous attachment to the external speech processor, which is positioned outside of the mastoid area. This approach is particularly beneficial for patients with compromised mastoid health, such as those suffering from chronic infections that may affect the ear's anatomy and function. The surgical intervention is meticulously planned, typically occurring in the retrosigmoid area or the squamous part of the temporal bone, behind the ear. The procedure requires careful preparation, including the removal of hair from the surgical site, precise measurement, and marking of the implant location. The surgical technique involves creating a subpericranial pocket for the implant components, ensuring that the integrity of surrounding structures, such as the sigmoid sinus and dura mater, is maintained. The procedure necessitates the removal of a significant surface area of bone, specifically greater than or equal to 100 square millimeters, to accommodate the implant and ensure proper integration with the living tissue over time. This careful approach not only enhances the effectiveness of the implant but also minimizes potential complications associated with the surgery.