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CMSNational Coverage Determination (NCD)

CMS Electroencephalographic Monitoring During Surgical Procedures Involving the Cerebral Vasculature Form


Electroencephalographic (EEG) Monitoring During Carotid Endarterectomies

Notes: EEG monitoring is covered for assessing cerebral blood flow during anesthesia.

Indications

(893760) Is the EEG monitoring conducted in association with a carotid endarterectomy? 
(893761) Is the person overseeing the EEG an electroencephalographer, a neurologist trained in EEG, or an advanced EEG technician? 

Electroencephalographic (EEG) Monitoring During Aneurysm Surgery with Hypotensive Anesthesia

Notes: EEG monitoring may be required when cerebral perfusion could be reduced.

Indications

(893762) Is the EEG monitoring performed during aneurysm surgery where hypotensive anesthesia is used? 
(893763) Is the person overseeing the EEG an electroencephalographer, a neurologist trained in EEG, or an advanced EEG technician? 

Electroencephalographic (EEG) Monitoring During Other Cerebral Vascular Procedures

Notes: EEG monitoring may be necessary to indirectly measure cerebral perfusion.

Indications

(893764) Is the EEG monitoring performed during other cerebral vascular procedures where cerebral blood flow may be interrupted? 

YesNoN/A
YesNoN/A

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Effective Date

06/19/2006

Last Reviewed

NA

Original Document

  Reference



CIM 35-57

Electroencephalographic (EEG) monitoring is a safe and reliable technique for the assessment of gross cerebral blood flow during general anesthesia and is covered under Medicare. Very characteristic changes in the EEG occur when cerebral perfusion is inadequate for cerebral function. EEG monitoring as an indirect measure of cerebral perfusion requires the expertise of an electroencephalographer, a neurologist trained in EEG, or an advanced EEG technician for its proper interpretation.

The EEG monitoring may be covered routinely in carotid endarterectomies and in other neurological procedures where cerebral perfusion could be reduced. Such other procedures might include aneurysm surgery where hypotensive anesthesia is used or other cerebral vascular procedures where cerebral blood flow may be interrupted.