CurrentAmbetter NevadaPolicy CP.MP.155

EEG in the Evaluation of Headache

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Defines the medical necessity and coding stance for electroencephalogram (EEG) when used in the diagnostic evaluation of patients presenting with headache for Ambetter Nevada members/enrollees.

Policy Summary

PayerAmbetter Nevada

PolicyEEG in the Evaluation of Headache

Policy CodePolicy CP.MP.155

Change TypeNo material changes

Effective Date

Next Review Date

Key ActionDocument clinical 'red flag' features (eg, new/worse or focal neurologic signs, altered mental status, seizures, sudden severe onset) to justify investigation beyond routine EEG.

SourceLink

POLICY UPDATE CHANGES

No material clinical or coverage changes in this revision.

5CPT codes listed as not medically necessary when billed with headache ICD-10 codes

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CurrentAmbetter NevadaPolicy CP.MP.155

EEG in the Evaluation of Headache

Customize your policy alerts

Sign up for Ambetter Nevada Policy CP.MP.155 alerts

Get alerted when Policy CP.MP.155 changes without checking for updates manually.

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Defines the medical necessity and coding stance for electroencephalogram (EEG) when used in the diagnostic evaluation of patients presenting with headache for Ambetter Nevada members/enrollees.

Policy Summary

PayerAmbetter Nevada

PolicyEEG in the Evaluation of Headache

Policy CodePolicy CP.MP.155

Change TypeNo material changes

Effective Date

Next Review Date

Key ActionDocument clinical 'red flag' features (eg, new/worse or focal neurologic signs, altered mental status, seizures, sudden severe onset) to justify investigation beyond routine EEG.

SourceLink

POLICY UPDATE CHANGES

No material clinical or coverage changes in this revision.

5CPT codes listed as not medically necessary when billed with headache ICD-10 codes

ICD-10 code groups/ranges called out for headache-related diagnoses

insufficientEvidence stance for routine EEG in headache evaluation

AANProfessional society guideline cited opposing routine EEG in headache

Coverage Criteria for EEG in Headache Evaluation

Medical necessity stance

Covered when clinically indicated; routine EEG for headache alone is not supported.

Primary policy statement: Routine EEG is not supported by sufficient evidence for the routine evaluation of headache and has not been shown to identify headache subtypes or be an effective screening tool for structural causes of headache.

Source: policy statement and literature review.

Clinical scenarios where EEG may be appropriate: EEG may be used when headache is accompanied by signs or symptoms suggesting seizure disorder or altered mental status (for example, atypical migrainous aura, episodic loss of consciousness, or clinical seizures) or when other specific clinical features indicate evaluation for seizure or encephalopathy (eg, altered mental status, exertional/sexual-associated headache, visual disturbances, new severe headache in pregnancy/postpartum).

Reflects AAN guidance and policy exceptions.

EEG performed routinely for the evaluation of headache without clinical features suggestive of seizure or other indications is considered unsupported. The policy states there is insufficient evidence in the peer-reviewed literature to support use of EEG as a routine test for headache evaluation, and it has not been shown to identify headache subtypes or serve as an effective screening tool for structural causes of headache.

Routine EEG in the evaluation of headache is not medically necessary when billed with the headache ICD-10-CM codes listed in Table 2. The CPT procedure codes identified as not medically necessary in this context are 95812, 95813, 95816, 95819, and 95822.

Relevant CPT and ICD-10-CM Codes

CPT codes not medically necessary when billed with corresponding headache ICD-10-CM codesCPTNot Covered

95812	Electroencephalogram (EEG) extended monitoring; 41 to 60 minutes
95813	Electroencephalogram (EEG) extended monitoring; 61 to 119 minutes
95816	Electroencephalogram (EEG); including recording awake and drowsy
95819	Electroencephalogram (EEG); including recording awake and asleep
95822	Electroencephalogram (EEG); recording in coma or sleep only

ICD-10-CM codes not to be billed with CPT codes in Table 1ICD-10

G43.001-G43.E19	Migraine (range indicated in Table 2)
G44.001-G44.89	Other headache syndromes (range indicated in Table 2)
R51.0	Headache with orthostatic component, not elsewhere classified
R51.9	Headache, unspecified

Provider Actions, Documentation & Prior Authorization

Prior Authorization

Prior authorization / denial risk for specific CPT/ICD pairings

EEG procedure codes listed in Table 1 (CPT 95812, 95813, 95816, 95819, 95822) are identified as not medically necessary when billed with the headache ICD-10-CM codes listed in Table 2; prior authorization may be required or claims may be denied when those CPT/ICD combinations are submitted.

Claims with the CPT/ICD pairings in Tables 1 and 2 may be denied or require prior authorization.

Note

Ensure clinical indication before ordering EEG

Confirm that the evaluation includes clinical features that could indicate seizure disorder or altered mental status before ordering an EEG for headache; routine EEG for headache alone is unsupported.

EEG is appropriate when headache is associated with signs or symptoms suggesting seizure disorder or altered mental status.

Background and Rationale

An electroencephalogram (EEG) is a noninvasive test that records electrical brain activity and is a useful diagnostic tool when evaluating epilepsy or altered consciousness. However, for patients presenting with headache, most disorders are primary (for example migraine, tension-type, or cluster headache) and do not generally require EEG. The policy emphasizes that routine EEG has not been demonstrated to improve diagnostic accuracy for headache, and its use should be reserved for situations where clinical features suggest seizure disorder or encephalopathy rather than as a screening test for all headache presentations.

Definitions and Key Concepts

EEG definition — Electroencephalogram

DefinitionElectroencephalogram (EEG): a noninvasive recording of electrical brain activity from standard scalp electrode sites using the international 10–20 electrode placement system.

PurposeAssesses neurophysiological function and is a useful diagnostic test in evaluating epilepsy and related disorders.

Recording methodElectrical activity is recorded from multiple standard sites on the scalp according to the international (10 to 20) system.

Clinical contextThis policy addresses the use of EEG in the diagnostic evaluation of headache, noting its primary role in epilepsy and altered consciousness evaluations.

Warning signs / red flags

Subacute or progressive headacheHeadaches that worsen over time (months).

Policy Summary

PayerAmbetter Nevada

PolicyEEG in the Evaluation of Headache

Policy CodePolicy CP.MP.155

Change TypeNo material changes

Effective Date

Next Review Date

Key ActionDocument clinical 'red flag' features (eg, new/worse or focal neurologic signs, altered mental status, seizures, sudden severe onset) to justify investigation beyond routine EEG.

SourceLink

On This Page

Documentation Required

Document red flags and clinical features to justify additional testing

Document warning signs or clinical features that justify EEG or further workup; include specific 'red flag' findings in the medical record.

Subacute or progressive headaches that worsen over months
A new or different headache, or headache of maximum severity at onset
New-onset headache after age 50
Headache precipitated by Valsalva maneuver
Systemic signs (fever, hypertension, myalgias, weight loss, scalp tenderness)
Neurological signs, altered mental status, or seizures
Headache associated with exertion or visual disturbances, or new severe headache in pregnancy/postpartum

Denial Risk

EEG CPT codes not medically necessary with headache diagnoses

The following EEG CPT codes are listed as not medically necessary when billed with the headache ICD-10-CM codes in Table 2 and may be denied:

95812 — Electroencephalogram (EEG) extended monitoring; 41 to 60 minutes
95813 — Electroencephalogram (EEG) extended monitoring; 61 to 119 minutes
95816 — Electroencephalogram (EEG); including recording awake and drowsy
95819 — Electroencephalogram (EEG); including recording awake and asleep
95822 — Electroencephalogram (EEG); recording in coma or sleep only

New or different headacheA headache pattern that is new for the patient or differs in quality from prior headaches.

New onset after age 50Headache beginning for the first time in a patient older than 50 years.

Valsalva‑precipitated headachePersistent headache precipitated by Valsalva maneuver (eg, coughing, straining).

Systemic signs suggesting secondary causeFindings such as fever, hypertension, myalgias, weight loss, or scalp tenderness indicating possible systemic disorder.

Focal neurological signs or altered mental statusPresence of focal neurologic deficits or changes in consciousness that may suggest a secondary intracranial process.