Neurologic Services and Procedures | UHC Coverage Update

TL;DR: UnitedHealthcare modified its neurologic-services-procedures Medicare Advantage medical policy on February 2, 2026, clarifying coverage guidance for three neurological procedures — magnetoencephalography (MEG), navigated transcranial magnetic stimulation (nTMS), and vagus nerve stimulation for strokes — affecting CPT codes 95965, 95966, 64999, and 64568, plus HCPCS code C1827.

UnitedHealthcare's neurologic services and procedures coverage policy now directs Medicare Advantage plans to external criteria sources — InterQual and UHC Commercial policies — for coverage determinations on MEG, nTMS, and vagus nerve stimulation for strokes. No National Coverage Determination (NCD) exists for any of these three procedures, and no Local Coverage Determination (LCD) or Local Coverage Article (LCA) covers them either. That means your billing team is working in a payer-specific coverage framework, not a CMS-defined one, and the rules differ by procedure.

Quick-Reference Table

UnitedHealthcare Neurologic Services Coverage Criteria and Medical Necessity Requirements 2026

The core issue with this policy is where coverage decisions live. For MEG (CPT 95965 and 95966), UnitedHealthcare sends you to InterQual CP: Imaging, Brain criteria. For nTMS (CPT 64999), you go to the UHC Commercial Medical Policy on Transcranial Magnetic Stimulation for Treating Physical Health Conditions. For vagus nerve stimulation for strokes (CPT 64568, HCPCS C1827), you go to the UHC Commercial Medical Policy on Vagus and External Trigeminal Nerve Stimulation.

Three procedures. Three different reference documents. If your billing team treats these as interchangeable, you'll get claim denials.

None of these procedures have an NCD governing them under traditional Medicare. That matters for Medicare Advantage billing because, without an NCD, UHC has discretion to set its own medical necessity standards. They're exercising that discretion here by pointing to external criteria — InterQual for MEG and internal Commercial policies for nTMS and vagus nerve stimulation.

Magnetoencephalography (CPT 95965, 95966)

MEG billing requires satisfying InterQual CP: Imaging, Brain criteria. InterQual criteria are subscription-based, so confirm your clinical staff has access before a procedure gets scheduled. If you're billing 95965 (spontaneous brain magnetic activity) or 95966 (evoked magnetic fields, single modality), your documentation needs to align with what InterQual specifies — and InterQual criteria can shift without a separate policy update from UHC. That's a monitoring problem your team needs to own.

Prior authorization requirements aren't spelled out explicitly in this policy document for MEG, but that's exactly the ambiguity that creates exposure. Check UHC's prior authorization tool for these codes before assuming authorization isn't required. A clean prior auth process is cheaper than a retrospective denial appeal.

Motor Function Mapping via nTMS (CPT 64999)

nTMS gets billed under CPT 64999 — the unlisted nervous system procedure code. Unlisted codes carry inherent reimbursement risk. They require manual review, and the criteria for coverage are buried in UHC's Commercial Medical Policy for Transcranial Magnetic Stimulation. Your medical necessity documentation needs to match what that commercial policy requires, even though you're billing Medicare Advantage. The coverage policy explicitly cross-references the commercial document.

Vagus Nerve Stimulation for Strokes (CPT 64568, HCPCS C1827)

This one has the highest financial exposure. CPT 64568 covers open implantation of a cranial nerve neurostimulator electrode array and pulse generator. HCPCS C1827 covers the implantable nonrechargeable generator itself. These are high-cost procedures with high-cost devices. The coverage policy defers to UHC's Commercial Medical Policy on Vagus and External Trigeminal Nerve Stimulation — meaning stroke-indication vagus nerve stimulation is judged by commercial criteria, not Medicare rules.

Medical necessity documentation for vagus nerve stimulation for strokes must support the stroke indication specifically. General VNS documentation for epilepsy won't carry over. This is the kind of case where looping in your compliance officer before submission is the right call.

Coverage Indications at a Glance

UnitedHealthcare Neurologic Services Billing Guidelines and Action Items 2026

The effective date is February 2, 2026. If your team hasn't already pulled the referenced external criteria documents, do it now.

CPT, HCPCS, and ICD-10 Codes for Neurologic Services Under neurologic-services-procedures

CPT Codes — All Procedures Under This Policy

HCPCS Codes

No ICD-10-CM diagnosis codes are listed in this policy. Diagnosis code selection should align with the criteria in the applicable external reference document for each procedure.

A Note on the Unlisted Code Problem

CPT 64999 deserves a separate callout. Using an unlisted code for nTMS isn't unusual — there's no dedicated CPT code for navigated transcranial magnetic stimulation — but it creates real reimbursement friction under any payer, including UHC Medicare Advantage. Unlisted codes don't have an assigned fee schedule rate. Reimbursement gets determined case by case, based on comparable procedures and your documentation.

That means your operative reports and clinical notes have to do extra work. They need to explain what was done, why it was medically necessary, and — critically — why existing CPT codes don't adequately describe the procedure. If your team submits 64999 without that level of documentation, expect delays, reduced payment, or denial.