Summary & Overview

CPT 95941: Intraoperative Neurophysiologic Monitoring During Brain Surgery

CPT code 95941 is an add-on code for intraoperative neurophysiologic monitoring during separately reportable brain surgery, billed for each hour of continuous monitoring performed by a non-surgeon, non-anesthesia provider. Nationally, this code supports documentation of intraoperative EEG, EMG, evoked potentials, or nerve conduction testing intended to protect neurologic function during complex cranial procedures. Its use matters for operating room staffing models, remote monitoring workflows, and alignment between surgical and neuromonitoring teams.

Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise policy and billing overview, payer coverage landscape, common modifiers, and the clinical context that typically drives use of the code. The publication outlines practical benchmarks for utilization and reimbursement patterns, highlights recent policy updates affecting add-on intraoperative monitoring codes, and summarizes considerations for documentation and concurrent-procedure monitoring scenarios. Data not available in the input is noted where applicable. The content is intended for national audiences including hospital billing teams, neurophysiology service providers, and policy analysts seeking a clear summary of CPT code 95941 and its role in perioperative care.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicare95941CPTneurophysiologic monitoringintraoperative monitoringEEGEMGbrain surgeryadd-on code

Billing Code Overview

CPT code 95941 describes intraoperative neurophysiologic monitoring performed by a provider other than the surgeon or anesthesia staff during a separately reportable brain surgery. The service consists of continuous neurophysiology testing — for example, electroencephalography (EEG), electromyography (EMG), evoked potentials, or nerve conduction studies — delivered during the same operative session to assess and ensure nervous system function throughout the surgical period. This add-on CPT code represents each hour of monitoring and may apply when the monitoring provider is remote or physically present and may cover monitoring for more than one simultaneous procedure.

Service type: Intraoperative neurophysiologic monitoring
Typical site of service: Operating room during brain surgery

Clinical & Coding Specifications

Clinical Context

A 48-year-old patient is undergoing resection of a supratentorial brain tumor under general anesthesia. Intraoperative neurophysiologic monitoring (IONM) is required to continuously assess cortical EEG, motor-evoked potentials (MEPs), somatosensory-evoked potentials (SSEPs), and spontaneous electromyography (EMG) to reduce the risk of intraoperative neurologic injury. A neurophysiologist (not the surgeon or anesthesia staff) provides live monitoring from an adjacent control room and documents hourly monitoring segments during the operation. The monitoring begins prior to incision to establish baseline signals, continues throughout critical surgical stages (mapping and tumor resection), and extends into the immediate post-resection period to confirm preserved neural function. The neurophysiologist may monitor multiple cases simultaneously and bills 95941 as an add-on code per hour of monitoring during the same session as the separately reportable brain surgery.

Coding Specifications

Modifier	Description	When to Use
`26`	Professional component	Use when billing only the professional interpretation/monitoring component separate from technical equipment charges.
`59`

Taxonomy Code	Specialty	Notes
`207RH0000X`	Neurology	Neurologists provide intraoperative EEG/evoked potential interpretation and monitoring.
`2084P0200X`	Neurophysiology	Clinical neurophysiologists or neurodiagnostic specialists perform and interpret IONM.
`208D00000X`	Neurosurgery	Neurosurgeons order and coordinate intraoperative monitoring during brain surgery.
`207L00000X`	Anesthesiology	Anesthesiologists collaborate with monitoring team to manage physiologic variables affecting signals.
`208M00000X`	Physical Medicine & Rehabilitation	PM&R physicians with neurodiagnostic subspecialty may provide EMG/nerve conduction expertise.

ICD-10 Code	Description	Clinical Relevance
`G93.6`	Cerebral edema, unspecified	Brain swelling during tumor resection where monitoring helps detect compromise in cortical function.
`C71.9`	Malignant neoplasm of brain, unspecified	Primary indication for craniotomy and tumor resection where IONM is used to preserve neurologic function.
`G35`	Multiple sclerosis	Demyelinating disease where intraoperative monitoring may be used in procedures involving CNS structures.
`G40.909`	Epilepsy, unspecified, not intractable, without status epilepticus	Patients with seizure disorders undergoing resective or lesionectomy procedures where EEG monitoring is essential.
`S06.5X9A`	Traumatic subdural hemorrhage with loss of consciousness of unspecified duration, initial encounter	Acute neurosurgical cases where monitoring assists in assessing cortical function during evacuation procedures.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`95940`	Continuous intraoperative neurophysiology monitoring, one-on-one monitoring for presence of intraoperative neurologic function, initial hour	Represents the base/initial hour monitoring service in some coding systems; `95941` is an add-on for additional hours.
`95942`	Continuous intraoperative neurophysiology monitoring, each additional hour	Alternative/additional add-on code used in some reporting schemas for further hourly monitoring beyond the initial hour.
`95816`	Electroencephalogram (EEG) during intraoperative monitoring	EEG components obtained intraoperatively that contribute to the monitoring documented with `95941`.
`95885`	Needle electromyography (EMG); 2-3 extremities, limited study	EMG recordings used intraoperatively for motor unit assessment during nerve or spine procedures and may be part of the monitoring mix.
`95920`	Nerve conduction studies; limited, each study	Intraoperative nerve conduction testing that supports continuous monitoring and nerve function assessment during surgery.

OpenPayer