Summary & Overview
CPT 61720: Stereotactic Lesioning of Globus Pallidus or Thalamus
CPT code 61720 represents a stereotactic neurosurgical lesioning procedure of deep brain structures, specifically the globus pallidus or thalamus, performed using a three-dimensional coordinate system for precise localization. Nationally, this code captures a specialized functional neurosurgery service used in management of select movement and neuropsychiatric disorders and is relevant for hospitals, neurosurgical centers, and payer medical policy.
Key payers in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. The publication presents clinical context for the procedure, common sites of service, and the billing considerations tied to stereotactic lesioning. Readers will find benchmarks and summary-level guidance on coding scope, typical service settings, and the kinds of clinical scenarios that invoke use of this code. It also outlines where input data are not available for this code (for example, specific ICD-10 pairings, payer-specific coverage rules, and associated taxonomies) as provided in the source.
This summary is intended to inform coding professionals, revenue cycle managers, and policy analysts about the clinical definition, typical use settings, and payer landscape relevant to CPT code 61720 without offering clinical recommendations.
Billing Code Overview
CPT code 61720 describes a stereotactic lesioning procedure targeting subcortical brain structures, specifically the globus pallidus or thalamus. The procedure uses a stereotactic method, employing a three-dimensional coordinate system to precisely locate and create a lesion in a small target within the brain.
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Service type: Stereotactic neurosurgical lesioning procedure
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Typical site of service: Hospital operating room or specialized inpatient/outpatient neurosurgery suite
Clinical & Coding Specifications
Clinical Context
A 62-year-old patient with medically refractory Parkinson disease (severe resting tremor and rigidity despite optimal medication) is evaluated by a multidisciplinary team including a neurosurgeon and movement-disorders neurologist. After imaging and stereotactic planning, the patient undergoes a stereotactic thermal or radiofrequency lesioning procedure targeting the globus pallidus internus or the ventral intermediate nucleus of the thalamus to reduce tremor and rigidity. Preoperative workflow includes history and exam, medication adjustment, brain MRI/CT for stereotactic localization, informed consent, anesthesia evaluation, and stereotactic frame or frameless navigation placement. Intraoperative workflow includes stereotactic targeting using a three-dimensional coordinate system, microelectrode recording or test stimulation as indicated, creation of the lesion in the globus pallidus or thalamus, immediate neurologic assessment, and postoperative imaging to confirm target and assess complications. Typical post‑procedure care includes neurologic monitoring, pain control, wound care, medication reconciliation, and follow-up for functional outcomes and programming if applicable.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
00 | Anesthesia by the operating surgeon (not a CMS standard modifier for anesthesia; used in some payer systems) | Rare; only if payer-specific policy requires this code when surgeon administers anesthesia — verify payer rules. |