CPT® Code 69670

The procedure described by CPT® Code 69670, known as mastoid obliteration, is a surgical intervention aimed at reducing the size of the mastoid cavity that results from a prior mastoidectomy. A mastoidectomy is a surgical procedure that involves the removal of infected air cells within the mastoid bone, which is located behind the ear. Following this procedure, a cavity is often left behind, which can lead to complications such as infection or the need for further surgical intervention. Mastoid obliteration addresses these issues by filling the cavity to promote healing and prevent future complications. The surgery is typically performed using a postauricular approach, which involves making an incision behind the ear to access the mastoid cavity. During the procedure, the surgeon may create a local flap or utilize a free flap or graft made from bone, cartilage, and/or fat. A common technique involves the use of autogenous cranial bone, which is bone harvested from the patient's own skull. This bone is processed and combined with an antibiotic solution to create a paste that is then used to fill the mastoid cavity. The goal of this procedure is to induce the formation of new bone, effectively obliterating the cavity and epitympanic spaces, thereby restoring normal anatomy and function. After the graft material is placed, the incision is closed, completing the procedure.