Summary & Overview
HCPCS Level II S8035: Magnetic Source Imaging
HCPCS Level II code S8035 denotes magnetic source imaging, a specialized diagnostic neuroimaging modality used to noninvasively map neuronal magnetic activity. Nationally, magnetic source imaging plays a role in pre-surgical evaluation, seizure localization, and advanced neurodiagnostic assessment, making accurate coding and coverage understanding important for facilities and clinicians who provide or order advanced neurophysiologic imaging.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. The publication provides a concise overview of how S8035 is defined, typical sites of service, and the clinical contexts where magnetic source imaging is utilized. Readers will find benchmarks for utilization and reimbursement practices where available, summaries of payer policy trends affecting advanced neuroimaging, and clinical context to support appropriate use of the code.
This summary focuses on national considerations for coding, billing, and clinical application of magnetic source imaging rather than state-specific policies. Data not available in the input will be noted where appropriate in detailed sections.
Billing Code Overview
HCPCS Level II code S8035 represents magnetic source imaging, a diagnostic neuroimaging procedure that maps magnetic signals produced by neuronal activity. The service type is diagnostic neurophysiology imaging, and the typical site of service is an outpatient imaging center or hospital-based radiology/neurology department.
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Clinical & Coding Specifications
Clinical Context
A typical patient is an adult referred by a neurologist or neurosurgeon for functional brain mapping using magnetic source imaging (S8035) to localize epileptogenic foci prior to epilepsy surgery evaluation. The patient presents after recurrent focal seizures despite medical therapy. Pre-procedure workflow includes review of prior MRI and EEG, medication management to minimize seizure risk during recording, informed consent, and scheduling in an outpatient neurophysiology or imaging center. On the day of service the patient is positioned in the magnetoencephalography system; head localization coils and continuous EEG leads are applied. Resting-state and task-based recordings are obtained, often with somatosensory, auditory or language tasks to map eloquent cortex. Data are post-processed with source localization algorithms and coregistered to the patient’s MRI. A multidisciplinary conference (epileptologist, neurosurgeon, neuroradiologist) reviews the magnetic source imaging report to plan invasive monitoring or resection. Typical site of service is an outpatient imaging center, hospital outpatient department, or comprehensive epilepsy center.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | Use when billing only the interpreting physician’s service separate from the technical component. |