Summary & Overview
CPT 61536: Resection of Epileptogenic Focus via Craniotomy
CPT code 61536 denotes a neurosurgical resection in which a portion of the skull bone flap is elevated to excise an epileptogenic focus, the brain tissue responsible for generating focal seizures. This procedure is clinically significant for patients with drug-resistant focal epilepsy and has implications for surgical capacity, perioperative care resources, and long-term neurologic outcomes across the health system. Nationally, the code represents an advanced, resource-intensive operative service performed by neurosurgeons and multidisciplinary epilepsy teams.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of clinical context, typical sites of service, and the service type. The publication outlines benchmarks where available, common billing modifiers (listed separately), and policy or coverage considerations that influence authorization and payment pathways. The piece also summarizes typical clinical indications and care-setting implications for hospitals and surgical centers. Data not available in the input is noted where specific payer benchmarks, associated taxonomies, ICD-10 mappings, or related procedure codes are absent.
Billing Code Overview
CPT code 61536 describes a neurosurgical procedure in which the provider elevates a portion of the skull bone flap to excise an epileptogenic focus, the area of brain tissue generating seizure-causing electrical impulses. This procedure is a form of resective epilepsy surgery intended to remove or reduce the brain tissue responsible for focal seizures.
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Service type: Neurosurgical resection for epilepsy (resective epilepsy surgery)
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Typical site of service: Inpatient or outpatient hospital surgical setting, typically performed in an operating room with neurosurgical support and perioperative monitoring
Data not available in the input.
Clinical & Coding Specifications
Clinical Context
A typical patient is an adult with medically refractory focal epilepsy localized to a cortical region (for example, mesial temporal sclerosis or a neocortical epileptogenic lesion) who has undergone comprehensive presurgical evaluation including MRI, video-EEG monitoring, and neuropsychological testing. The surgical workflow begins with preoperative planning and informed consent, followed by general anesthesia. A craniotomy is performed to elevate a skull bone flap and expose the cortex. The surgeon identifies the epileptogenic focus using intraoperative neuronavigation, electrocorticography, and direct cortical stimulation as needed, then performs a tailored cortical resection or lesionectomy to remove the seizure focus. Hemostasis is achieved, the dura and bone flap are replaced as indicated, and the patient is transferred to a neurosurgical recovery unit or intensive care unit for close neurologic monitoring and postoperative imaging and anticonvulsant management.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
00 | No modifier (default) | Use when no additional modifier applies and procedure is billed normally |
22 | Increased procedural services |