Electroencephalography - (0521) — MM 0521 | CIGNA Coverage Update

Cigna modified MM 0521 covering electroencephalography, effective February 14, 2026. Here's what billing teams need to know before submitting EEG claims.

Cigna Healthcare updated its EEG coverage policy under policy code MM 0521, affecting 41 CPT codes across ambulatory EEG, continuous EEG monitoring, video EEG (VEEG), digital spike analysis, and remote sub-scalp EEG monitoring. The update clarifies medical necessity criteria for codes 95700 through 95958 and explicitly designates Category III codes 1008T and 1009T — remote monitoring of sub-scalp implanted bilateral EEG systems — as experimental and investigational. If your practice bills any of these codes for Cigna members, your charge capture and prior authorization workflows need a review before claims go out the door.

Quick-Reference Table

Cigna EEG Coverage Criteria and Medical Necessity Requirements 2026

The Cigna EEG coverage policy under MM 0521 covers ambulatory and continuous EEG monitoring, VEEG, digital spike analysis, polysomnography, and intraoperative EEG — when specific medical necessity criteria are met. Covered indications center on the diagnosis and management of seizure activity and epilepsy, including intractable and non-intractable forms across both focal and generalized syndromes.

The bulk of the covered CPT codes fall into two main categories. First, standard and extended EEG codes: 95812 (41–60 minutes), 95813 (61–119 minutes), 95816 (awake and drowsy), 95819 (awake and asleep), 95822 (coma or sleep only), and 95824 (cerebral death evaluation). Second, continuous recording codes — 95700 through 95726 — covering setup, technologist review, and physician interpretation across varying duration ranges, with and without video.

Medical necessity documentation is the real issue here. Cigna requires clinical justification tied to covered ICD-10 diagnoses, most of which fall under the G40.xxx epilepsy and seizure category. Vague documentation or mismatched diagnosis codes are the fastest route to a claim denial.

Prior authorization requirements are not explicitly enumerated in the policy data, but that doesn't mean they don't apply. For continuous long-term EEG monitoring — especially multi-day recordings using codes 95721 through 95726 — check the member's specific plan for prior authorization requirements before scheduling. Cigna plan-level PA requirements can override the base coverage policy.

Reimbursement for these services hinges on meeting both the clinical criteria and the code-specific documentation requirements. The distinction between technologist-only review (95705–95716) and physician interpretation (95717–95726) must be reflected in your billing and in your documentation.

Cigna EEG Exclusions and Non-Covered Indications

This is the cleanest part of the update. Cigna Healthcare explicitly calls out two Category III codes as experimental, investigational, and unproven:

These codes describe remote follow-up for sub-scalp EEG implants — a newer approach to continuous seizure monitoring outside the hospital. Cigna isn't covering it. Full stop.

This is the same pattern we've seen from Cigna on other implantable monitoring technologies. New Category III codes get the "experimental" label until there's sufficient peer-reviewed evidence for coverage. If your practice has patients with sub-scalp implanted EEG systems and you're billing 1008T or 1009T to Cigna, those claims will deny. Don't wait for the denial to figure that out.

Inform your neurologists and epileptologists now. If they're implanting these devices, the remote monitoring billing goes nowhere with Cigna under this policy. That's a conversation worth having before February 14, 2026.

Coverage Indications at a Glance

Cigna EEG Billing Guidelines and Action Items 2026

If your practice spans multiple service lines — neurology, epilepsy monitoring units, sleep medicine, and intraoperative neurophysiology — talk to your compliance officer about how MM 0521 cuts across each billing workflow. The scope of this policy is broader than most EEG updates.

CPT, HCPCS, and ICD-10 Codes for Electroencephalography Under MM 0521

Covered CPT Codes (When Medical Necessity Criteria Are Met)

Not Covered / Experimental Codes

Key ICD-10-CM Diagnosis Codes

The full policy includes 91 ICD-10-CM codes. The complete code list is available in the MM 0521 Cigna system policy document.