CPT code 61864 designates an add-on stereotactic neurosurgical procedure for placement of an additional neurostimulator electrode array in a subcortical site during the same session as an initial array placement. The procedure involves cranial access via burr holes or removal of a skull portion and uses a three-dimensional stereotactic coordinate system; intraoperative microelectrode recording is not performed. This code is clinically relevant for treatment of chronic, difficult-to-control movement disorders such as tremor, dystonia, involuntary movements, and Parkinson’s disease.

Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a national perspective on coding and clinical context for 61864, including typical sites of service and clinical indications. The publication outlines benchmarks and reimbursement considerations where available, highlights recent policy and coverage trends affecting stereotactic neurostimulator procedures, and provides operational context for billing this add-on code alongside primary implantation services. Data not available in the input is noted where applicable.