Summary & Overview
CPT 95813: Extended Electroencephalogram Monitoring (61–119 Minutes)
CPT code 95813 represents extended electroencephalogram (EEG) monitoring performed for a duration of 61 to 119 minutes. EEGs are key diagnostic tools in neurology used to evaluate seizures, altered mental status, sleep disorders, and other conditions affecting cerebral electrical activity. Extended recordings provide additional clinical data beyond brief routine EEGs and can capture intermittent abnormalities that inform diagnosis and management. Nationally, extended EEGs are significant for inpatient and outpatient neurology care and for payment policy given variability in site-of-service billing and clinical use.
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 for 95813, common settings where the service is delivered, and the operational definition tied to the 61–119 minute monitoring window. The publication outlines typical payer coverage considerations, common modifiers used with neurodiagnostic services, and how 95813 relates to other EEG service codes. Policy and billing implications such as site-of-service differences, documentation expectations, and coding combinations are summarized to help billing professionals, revenue cycle staff, and clinical program managers understand when 95813 is used and how it fits into broader EEG service lines.
Data not available in the input: associated taxonomies, ICD-10 diagnoses, related codes, and service line-specific benchmarks.
Billing Code Overview
CPT code 95813 describes an extended electroencephalogram (EEG) monitoring procedure. The service records the brain's electrical activity using small electrodes attached to the scalp and is intended for prolonged observation beyond a standard EEG recording.
Service type: Extended electroencephalogram monitoring (61–119 minutes)
Typical site of service: Hospital outpatient department, ambulatory EEG lab, or other clinical settings capable of neurodiagnostic monitoring
Clinical & Coding Specifications
Clinical Context
A 28-year-old patient is referred to the neurology clinic for evaluation of recurrent, unexplained staring spells and intermittent limb jerking. The neurologist orders an extended routine electroencephalogram to capture longer interictal activity and possible subclinical seizures. The patient arrives to the ambulatory EEG suite; scalp electrodes are applied according to the international 10–20 system, impedance is checked, and a baseline recording is obtained. The technologist performs activation procedures (hyperventilation, photic stimulation) as indicated. The electroencephalogram recording continues for an extended duration of 61 to 119 minutes to increase the likelihood of capturing epileptiform discharges or clinical events. The study is monitored in real time; the technologist documents clinical observations and event markers. After completion, the raw EEG data are processed, annotated, and transmitted to the interpreting neurologist. The neurologist reviews the full recording, provides a written report describing background activity, presence or absence of epileptiform discharges, and correlation with any clinical events, and assigns diagnostic impression and recommendations for further testing or treatment as appropriate.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | Use when only the physician interpretation/report is billed separate from technical recording. |
TC | Technical component | Use when only the technical recording (EEG acquisition) is billed by the facility or technologist.