Summary & Overview
CPT 0858T: Transcranial Magnetic Stimulation with Evoked Potential Recording
CPT code 0858T denotes a neurodiagnostic procedure that combines transcranial magnetic stimulation (TMS) with scalp electrode recording to measure brain electrical responses and generate an automated report. This code captures a specialized diagnostic service used in the assessment of neurologic conditions where cortical excitability, conduction pathways, or treatment response to magnetic stimulation are relevant. Nationally, such procedures are relevant for centers offering advanced neuromodulation and diagnostic services and influence clinical workflows and coverage discussions.
Key payers considered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. The publication covers payer coverage trends, reimbursement benchmarks, clinical context for use, and documentation considerations associated with the technology.
Readers will learn what clinical situations prompt use of CPT code 0858T, where the procedure is typically delivered, expected reporting elements tied to the automated output, and how major payers and Medicare approach coverage and coding. The report also summarizes available benchmarks and policy updates where present. Data not available in the input is noted where applicable.
Billing Code Overview
CPT code 0858T describes a procedure in which a provider applies electrodes on the patient’s scalp to deliver magnetic stimulation through the skull and measures the brain’s electrical activity in response to those stimuli. The testing device automatically processes signals and generates an automated report to assist the provider’s assessment of certain brain conditions.
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Service type: Neurophysiologic testing with combined transcranial magnetic stimulation and evoked potential recording, including automated signal processing and report generation
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Typical site of service: Ambulatory clinic or specialty neurodiagnostic laboratory, including outpatient neurology or brain stimulation clinics
Clinical & Coding Specifications
Clinical Context
A 45-year-old patient with treatment-resistant major depressive disorder is scheduled for a diagnostic cortical excitability assessment using transcranial magnetic stimulation with concurrent EEG. The patient arrives at an outpatient neurology or psychiatry clinic or ambulatory procedure suite. The provider applies adhesive or cup electrodes to the patient’s scalp, positions the magnetic coil over target cortical regions, delivers single-pulse or paired-pulse magnetic stimuli through the skull, and records the brain’s evoked electrical responses. The device automatically processes signals and generates an automated report to assist the provider’s assessment of cortical reactivity, motor threshold, or network connectivity related to conditions such as depression, epilepsy evaluation, or traumatic brain injury. Typical workflow steps include patient consent and history review, electrode placement and impedance check, calibration and stimulus delivery, acquisition of automated signal processing and report generation, and provider review of the automated report to inform diagnostic or treatment planning. Typical site of service is an outpatient clinic or ambulatory procedure center; the service type is diagnostic neurophysiology testing using transcranial magnetic stimulation with automated report generation.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
22 | Increased procedural services | Use when the work required to perform the procedure is substantially greater than typically required due to complexity or patient factors. |