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

TL;DR: Cigna Healthcare modified MM 0521, its electroencephalography coverage policy, effective February 14, 2026. Here's what billing teams need to do.

Cigna Healthcare updated Coverage Policy MM 0521 governing ambulatory EEG, continuous EEG recording, digital spike analysis, and remote sub-scalp EEG monitoring. The policy covers 41 CPT codes — from routine EEGs like 95816 and 95819 to continuous recording codes 95700 through 95726 — and draws a hard line on two Category III codes. If your team bills any EEG-related services for Cigna members, this change affects your charge capture, your medical necessity documentation, and potentially your reimbursement.

Quick-Reference Table

Cigna Electroencephalography Coverage Criteria and Medical Necessity Requirements 2026

The Cigna electroencephalography coverage policy under MM 0521 covers ambulatory EEG for the diagnosis and management of seizure activity. It also covers digital EEG spike analysis (CPT 95957) and a broad range of continuous recording services billed under CPT 95700 through 95726.

Medical necessity is the central test here. Cigna requires that the EEG service be medically necessary based on applicable criteria stated in the policy. That language applies across nearly all 39 covered CPT codes — from basic awake-and-drowsy recordings (95816) to extended monitoring sessions exceeding 12 hours with video (95716, 95726).

Coverage extends to sleep studies tied to EEG interpretation. Codes 95782, 95806, 95807, 95808, and 95810 — covering polysomnography and unattended sleep studies — are included when medical necessity criteria are met. This matters for neurology practices that co-manage sleep-related seizure activity with sleep medicine.

Prior authorization requirements are not explicitly detailed in the public-facing summary of this policy. If your Cigna contract requires prior authorization for extended monitoring sessions or ambulatory EEG, verify your authorization workflow against the February 14, 2026 effective date. Don't assume prior auth requirements are unchanged just because the codes haven't changed.

One more thing: Cigna covers the Wada activation test (CPT 95958) and pharmacological or physical activation EEGs (CPT 95954) under this same coverage policy. These are pre-surgical epilepsy workup codes. Make sure your documentation clearly ties the service to a covered ICD-10 diagnosis — the epilepsy code range under G40 is extensive, and the right specificity matters for claim approval.

Cigna Electroencephalography Exclusions and Non-Covered Indications

Two codes get the experimental/investigational/unproven designation under MM 0521. Both involve remote monitoring of sub-scalp implanted bilateral EEG systems.

CPT 1008T covers the initial setup and monitoring component. CPT 1009T covers subsequent remote monitoring of the same sub-scalp device. Cigna considers both not covered under this policy.

This is consistent with where most major payers stand on sub-scalp EEG technology. The devices — designed for long-term ambulatory seizure detection without external electrodes — are commercially available but lack the clinical evidence base payers require for covered status. Expect these to stay in experimental status for at least another policy cycle.

If your epilepsy program is using sub-scalp EEG technology and billing 1008T or 1009T, stop billing Cigna members for those services now. Claims will deny. Build that into your patient financial counseling workflow before you place the device.

Coverage Indications at a Glance

Cigna Electroencephalography Billing Guidelines and Action Items 2026

If your practice handles high volumes of intraoperative neurophysiology (CPT 95955) or pre-surgical epilepsy workups (95954, 95958), talk to your compliance officer about whether your documentation meets Cigna's medical necessity threshold. These are lower-volume, higher-scrutiny codes.

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

Covered CPT Codes (When Medical Necessity Criteria Are Met)

Not Covered / Experimental CPT Codes

Key ICD-10-CM Diagnosis Codes

The full ICD-10-CM list in MM 0521 runs to 91 codes. Pull the complete list from the official Cigna policy source before finalizing your billing guidelines. Coding to an unrecognized diagnosis is a fast path to claim denial.