TL;DR: The Centers for Medicare & Medicaid Services modified NCD 214, the National Coverage Determination governing Medicare coverage of telephone transmission of EEGs, effective March 7, 2026. Here's what billing teams need to know.
CMS updated NCD 214 to clarify when telephone-transmitted EEG services are covered as a physician's service or incident to a physician's service under Medicare. The policy does not list specific CPT or HCPCS codes in its current form — which means your billing team needs to know the coverage criteria cold before submitting claims. The clinical indications and the one hard exclusion (brain death determination) are where denials will live or die.
| Field | Detail |
|---|---|
| Payer | Centers for Medicare & Medicaid Services (CMS) |
| Policy | Telephone Transmission of EEGs |
| Policy Code | NCD 214 |
| Change Type | Modified |
| Effective Date | March 7, 2026 |
| Impact Level | Medium |
| Specialties Affected | Neurology, Neurosurgery, Electroencephalography, Remote/Rural Facilities |
| Key Action | Audit claim documentation against NCD 214's five covered indications and confirm no claims are going out for brain death determinations under this NCD |
CMS Telephone EEG Coverage Criteria and Medical Necessity Requirements 2026
NCD 214 is the National Coverage Determination governing whether Medicare will reimburse for telephone transmission of EEGs — a service that lets remote facilities send EEG data to neurologists and neurosurgeons without transporting patients to large medical centers. CMS covers this service when it's reasonable and necessary for the individual patient and billed either as a physician's service or incident to a physician's service.
That "reasonable and necessary" standard is not decoration. Your documentation has to tie the telephone transmission directly to one of the five clinical indications CMS specifies. A generic referral to "EEG monitoring" is not going to hold up on audit.
The CMS coverage policy identifies five clinical situations where telephone transmission of EEGs is appropriate:
| # | Covered Indication |
|---|---|
| 1 | Altered consciousness — stuporous, semicomatose, or comatose states |
| 2 | Atypical seizure variants — including spike and wave stupor and other distressing or bizarre seizure presentations |
| 3 | Suspected intracranial tumor — diagnosis support |
| 4 | Head injury — specifically where subdural hematoma may be identified |
| 5 | Acute headaches — including migraine syndrome, where abnormal EEG responses may be present |
Each of these represents a clinical scenario where the value of rapid, remote EEG interpretation justifies the service. The common thread is urgency and remoteness — this is a coverage policy built around keeping patients out of unnecessary transport, and your documentation should reflect that framing.
No prior authorization requirements are specified in NCD 214 for this service. That doesn't mean your MAC won't have Local Coverage Determinations layered on top — check your jurisdiction's LCD before assuming you're in the clear.
CMS Telephone EEG Exclusions and Non-Covered Indications
There is one explicit exclusion in NCD 214, and it's a hard no: telephone transmission of EEGs for determining electrical inactivity — that is, brain death — is not covered.
CMS is direct about the reason. Signal interference is unavoidable in telephonically transmitted EEGs, which makes the technology unreliable for confirming brain death. This isn't a soft guidance item. Submitting a claim for telephone-transmitted EEG in a brain death determination context is a coverage violation, not an ambiguous edge case.
If your facility handles brain death protocols, make sure your documentation language doesn't inadvertently signal brain death evaluation — even when the underlying indication is something else entirely, like a comatose state. A comatose patient is a covered indication. A brain death determination is not. That distinction has to be crystal clear in the clinical record.
Coverage Indications at a Glance
| Indication | Status | Relevant Codes | Notes |
|---|---|---|---|
| Altered consciousness (stuporous, semicomatose, comatose states) | Covered | Not specified in NCD | Must document clinical necessity; incident-to or physician's service |
| Atypical seizure variants (spike and wave stupor, bizarre/distressing symptoms) | Covered | Not specified in NCD | Documentation must describe atypical presentation |
| Suspected intracranial tumor (diagnostic) | Covered | Not specified in NCD | Diagnosis support context required |
| Head injury with possible subdural hematoma | Covered | Not specified in NCD | Document injury and clinical suspicion of hematoma |
| Acute headaches during acute phase (e.g., migraine with abnormal responses) | Covered | Not specified in NCD | Must be acute phase; migraine with abnormal EEG response |
| Brain death / electrical inactivity determination | Not Covered | Not specified in NCD | Signal interference makes this unreliable; explicitly excluded by CMS |
CMS Telephone EEG Billing Guidelines and Action Items 2026
The absence of specific CPT or HCPCS codes in NCD 214 is the first thing your billing team needs to deal with. It puts more weight on documentation and local policy than on code-level rules. Here's what to do before claims go out under this updated policy.
| # | Action Item |
|---|---|
| 1 | Pull your MAC's Local Coverage Determination before March 7, 2026. NCD 214 sets the national floor, but your MAC almost certainly has an LCD with code-level specificity for telephone-transmitted EEG services. The national policy not listing codes does not mean you can bill without knowing which codes your MAC accepts. |
| 2 | Update your clinical documentation templates to mirror the five NCD 214 indications. Physicians documenting telephone EEG requests should explicitly state which covered indication applies — altered consciousness, atypical seizure variant, suspected tumor, head injury, or acute headache. Vague documentation is a denial waiting to happen. |
| 3 | Flag any brain death determination workflows that currently include telephone EEG. If your facility or any referring facility sends EEG data telephonically as part of a brain death protocol, that workflow is not covered under NCD 214. Identify it, escalate to your medical director, and correct it before the March 7, 2026 effective date. |
| 4 | Confirm your "incident to" billing documentation is airtight. NCD 214 covers this service both as a physician's service and incident to a physician's service. If you're billing incident-to, your documentation needs to satisfy Medicare's supervision requirements — the physician must be present in the office suite and immediately available. Incident-to denials are common and avoidable. |
| 5 | Run a look-back on recent telephone EEG claims. If your team has been billing this service, pull claims from the last 12 months and check them against the NCD 214 criteria. If you find claims submitted for brain death determination or without documented covered indications, talk to your compliance officer about corrective action before the updated policy takes effect. |
| 6 | Brief your remote and rural facility contacts. NCD 214 was designed partly for remote areas lacking neurological specialists. If you work with critical access hospitals or rural health clinics that transmit EEGs to your neurologists, they need to know what documentation their ordering physicians must generate to support your claim. |
| 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 Transmission of EEGs Under NCD 214
NCD 214 as published does not list specific CPT codes, HCPCS codes, or ICD-10-CM diagnosis codes. This is not an oversight you can work around by guessing — billing the wrong code is worse than calling your MAC directly.
Your next step is to contact your Medicare Administrative Contractor and ask specifically which procedure codes they recognize for telephone-transmitted EEG services under NCD 214. Most MACs will have this documented in a companion LCD or billing and coding article. Do not bill this service without that confirmation.
The real financial exposure here isn't from a complex code set. It's from billing a service that lacks the right MAC-level code support, or submitting without the documented indications CMS requires. Either path leads to the same place: a denied claim and a documentation headache on appeal.
If you're billing for neurologists or neurosurgical practices that interpret telephonically transmitted EEGs from remote sites, loop in your billing consultant now. The reimbursement model for the reading physician versus the transmitting facility is exactly the kind of split-billing scenario where errors cluster.
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