What is the full CPT code description for 61535? A. Craniotomy with elevation of bone flap; for subdural implantation of an electrode array, for long-term seizure monitoring; for removal of epidural or subdural electrode array, without excision of cerebral tissue (separate procedure) B. Craniotomy with elevation of bone flap; for removal of epidural or subdural electrode array, without excision of cerebral tissue (separate procedure) C. For removal of epidural or subdural electrode array, without excision of cerebral tissue (separate procedure) D. For excision of epileptogenic focus without electrocorticography during surgery; ; for removal of epidural or subdural electrode array, without excision of cerebral tissue (separate procedure)