TL;DR: The Centers for Medicare & Medicaid Services modified NCD 214 governing telephone transmission of EEGs, with an effective date of March 7, 2026. Here's what billing teams need to know.
CMS telephone EEG transmission coverage policy under NCD 214 Medicare has been updated. This modification clarifies when telephonically transmitted EEGs qualify as covered physician services — and draws a hard line around one specific clinical use that is explicitly not covered. This policy does not list specific CPT or HCPCS codes in its current form, which creates real documentation and charge capture challenges your billing team needs to address now.
| Field | Detail |
|---|---|
| Payer | CMS |
| Policy | Telephone Transmission of EEGs — NCD 214 |
| Policy Code | NCD 214 |
| Change Type | Modified |
| Effective Date | 2026-03-07 |
| Impact Level | Medium |
| Specialties Affected | Neurology, Neurosurgery, Electroencephalography, Radiology |
| Key Action | Audit your EEG transmission claims for medical necessity documentation against the five covered clinical scenarios before March 7, 2026 |
CMS Telephone EEG Transmission Coverage Criteria and Medical Necessity Requirements 2026
NCD 214 is the National Coverage Determination governing Medicare coverage of telephone transmission of EEGs. The Centers for Medicare & Medicaid Services covers this service as a physician's service or incident to a physician's service — but only when it is reasonable and necessary for the individual patient.
"Reasonable and necessary" is doing a lot of work in this policy. Your documentation needs to map directly to one of the five approved clinical scenarios. If it doesn't, you're looking at a claim denial.
The five covered clinical indications are:
| # | Covered Indication |
|---|---|
| 1 | Altered consciousness — stuporous, semicomatose, or comatose states |
| 2 | Atypical seizure variants — patients with bizarre or distressing symptoms, including spike and wave stupor and other seizure disorder variants |
| 3 | Suspected intracranial tumor diagnosis |
| 4 | Head injury — where subdural hematoma identification is clinically relevant |
| 5 | Acute-phase headaches — including migraine syndrome, where abnormal EEG responses may be present |
The policy is explicit that this service exists to serve patients in remote areas. The stated rationale is avoiding unnecessary patient transport to large medical centers for standard EEG testing. That framing matters for your medical necessity arguments — geographic context strengthens a claim. If your patient is in a facility near a major neurology center, expect scrutiny.
Coverage applies both as a direct physician service and as incident to a physician's service. Make sure your documentation clearly establishes which billing pathway you're using. Incident-to billing carries its own requirements around supervision, and those don't go away just because the EEG was transmitted remotely.
There is no prior authorization requirement stated in NCD 214. That said, your Medicare Administrative Contractor may have a local coverage determination that adds prior auth requirements on top of the NCD. Check with your MAC before assuming prior authorization isn't needed for your region.
CMS Telephone EEG Transmission Exclusions and Non-Covered Indications
This is the clearest language in the entire policy, and it's not ambiguous: telephonically transmitted EEGs must not be used to determine electrical inactivity — i.e., brain death determination.
The reason is technical and non-negotiable. Signal interference is unavoidable in telephone transmission. CMS will not cover telephone EEG transmission for brain death determination because the data quality is inherently unreliable for that purpose.
If a claim crosses your desk with brain death determination as the clinical context, don't bill it. There is no documentation strategy that makes this covered. The exclusion is categorical.
Coverage Indications at a Glance
| Indication | Status | Relevant Codes | Notes |
|---|---|---|---|
| Altered consciousness (stuporous, semicomatose, comatose states) | Covered | Not specified in policy | Document clinical state clearly in the record |
| Atypical seizure variants — spike and wave stupor, other seizure disorders | Covered | Not specified in policy | Bizarre or distressing symptoms must be documented |
| Suspected intracranial tumor diagnosis | Covered | Not specified in policy | Diagnostic context required |
| Head injury with suspected subdural hematoma | Covered | Not specified in policy | Injury context and hematoma suspicion must be documented |
| Acute-phase headaches, including migraine with abnormal EEG response | Covered | Not specified in policy | "Acute phase" language is key — document timing |
| Brain death / electrical inactivity determination | Not Covered | Not specified in policy | Excluded due to unavoidable signal interference — categorical exclusion |
CMS Telephone EEG Transmission Billing Guidelines and Action Items 2026
The absence of specific CPT or HCPCS codes in this policy is the practical challenge your team faces. NCD 214 does not enumerate codes. That means your charge capture depends entirely on correct documentation and code selection upstream. Here's what to do before March 7, 2026:
| # | Action Item |
|---|---|
| 1 | Audit your current EEG transmission claims against the five covered indications. Pull claims from the past 12 months where telephone EEG transmission was billed. Map each to one of the five covered clinical scenarios. Any claim that doesn't map clearly is a denial risk going forward. |
| 2 | Contact your MAC for applicable CPT and HCPCS codes. NCD 214 does not list specific codes. Your Medicare Administrative Contractor may have a local coverage determination or billing guidance that assigns specific codes to telephone EEG transmission. Get that in writing before March 7. |
| 3 | Update your charge capture templates to include the five covered indications as documentation prompts. Your ordering and billing workflows should prompt clinicians to document which of the five indications applies. Vague documentation is how otherwise-covered claims become denials. |
| 4 | Flag and quarantine any brain death determination EEG claims immediately. Create a hard stop in your billing workflow for this exclusion. If a coder sees brain death determination as the clinical context, the claim should not go out the door under NCD 214. |
| 5 | Clarify your incident-to billing pathway documentation. If you're billing telephone EEG transmission as incident to a physician's service rather than as a direct physician service, your documentation needs to satisfy the standard incident-to supervision requirements. Remote delivery of this service doesn't reduce that obligation. |
| 6 | Assess geographic context for at-risk claims. CMS frames this coverage partly around remote areas lacking neurology expertise. If your patient population is near a major neurology center, document why telephone transmission was clinically appropriate rather than patient transport. That clinical rationale protects your reimbursement. |
| 7 | Talk to your compliance officer if your facility bills telephone EEG for epilepsy monitoring programs or ICU settings. The five covered indications are specific. Systematic EEG monitoring programs may not fit neatly into these criteria. If you're not sure how NCD 214 applies to your case mix, get your compliance officer or billing consultant involved before the effective date. |
The real issue here is that this policy's medical necessity criteria are narrow and clinical. Billing teams can't paper over a weak clinical indication with better coding. The documentation has to come from the clinician, and it has to map to one of the five scenarios. Build that checkpoint into your workflow now.
| Previous Version | Current Version |
|---|---|
| Coverage is considered experimental and investigational for all indications | Coverage is considered medically necessary when specific criteria are met |
| Prior authorization is not required | Prior authorization is required for initial treatment |
| Documentation must include clinical history | Documentation must include clinical history |
| Re-review every 24 months | Re-review every 12 months with updated clinical documentation |
CPT, HCPCS, and ICD-10 Codes for Telephone EEG Transmission Under NCD 214
Covered Codes
NCD 214 does not list specific CPT, HCPCS, or ICD-10 codes in the current policy document. This is a known gap in the coverage policy as published.
For EEG transmission billing, your team will need to identify applicable codes through:
- Your Medicare Administrative Contractor's local coverage determination or billing guidance
- CMS Claims Processing Instructions cross-referenced in NCD 214
- Your practice management or coding vendor's reference materials for neurophysiology
Do not use codes that aren't validated against your MAC's guidance for this service. Guessing codes on a telephone EEG transmission claim is a fast route to a claim denial or a refund request.
| Code | Type | Description |
|---|---|---|
| Not specified in NCD 214 | — | Contact your MAC for applicable billing codes |
Not Covered
| Indication | Reason |
|---|---|
| Brain death / electrical inactivity determination via telephone EEG | Categorical exclusion — unavoidable signal interference makes telephone transmission unreliable for this purpose |
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