ModifiedUnitedHealthcarePolicy CS030ID.D

Deep Brain and Cortical Stimulation (for Idaho Only)

Medical policy governing coverage and medical necessity for deep brain stimulation (DBS) and responsive cortical stimulation (RNS) for members in the state of Idaho, including Idaho Medicaid Plus plans.

Policy Summary

PayerUnitedHealthcare

PolicyDeep Brain and Cortical Stimulation (for Idaho Only)

Policy CodePolicy CS030ID.D

Change TypeMaterial - coverage stance clarified

Effective DateJun 1, 2026

Next Review DateN/A

Key ActionDocument that DBS/cortical stimulation for OCD and other non-listed indications is unproven and not medically necessary; obtain and include multidisciplinary selection and research-approval documentation for any research cases.

SourceLink

POLICY UPDATE CHANGES

Added language to clarify deep brain stimulation and/or cortical stimulation are unproven and not medically necessary for treating obsessive-compulsive disorder (OCD) and all other indications not listed in the policy as proven and medically necessary.

Added notation that HCPCS code L8680 is not on the State of Idaho Medicaid Fee Schedule and therefore may not be covered by the State of Idaho Medicaid Program.

Updated Clinical Evidence, FDA, and References sections to reflect the most current information.

4indications listed as proven and medically necessary

OCDcondition listed as not medically necessary / unproven

MultipleCPT & HCPCS codes listed

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Coverage and Medical Necessity Criteria

Medically Necessary Indications

Covered when ALL of the following indications are met (per policy listing and InterQual reference):

Covered Indications for DBS: Deep brain stimulation is proven and medically necessary for treating dystonia, essential tremor, Parkinson disease, and refractory epilepsy for a partial or focal seizure disorder.

Refer to InterQual CP: Procedures, Stereotactic Introduction, Subcortical or Cortical Electrodes for medical necessity clinical coverage criteria.

Medically Necessary Indication — RNS

Covered when ALL of the following are met:

Covered Indication for RNS: Responsive cortical stimulation (closed-loop RNS) is proven and medically necessary for treating refractory partial or focal seizure disorder.

RNS System described; clinical coverage criteria per InterQual.

Unproven / Not Medically Necessary: DBS and Cortical Stimulation for OCD and other non-proven indications

Policy coverage stance based on updated evidence and guidance:

Primary stance: Deep brain stimulation and cortical stimulation are considered unproven and not medically necessary for treating obsessive-compulsive disorder (OCD) and all other indications not listed in the policy as proven and medically necessary.

Explicit policy summary of changes and coverage rationale.

Exceptions and research: Use in chronic, severe, treatment-resistant OCD should be limited to the context of research per NICE recommendations; multidisciplinary patient selection and performance in experienced centers are required for research settings.

NICE (2021) recommendation and policy alignment.

Deep brain stimulation (DBS) and cortical stimulation for obsessive-compulsive disorder (OCD) are considered unproven and not medically necessary because available studies are limited in size and quality and do not establish consistent, long-term efficacy or safety. The policy text reflects the conclusion that current evidence is insufficient to support routine coverage of DBS or cortical stimulation for OCD, and larger, high-quality trials with longer follow-up are needed to determine clinical benefit and risks.

This coverage stance was explicitly added in the policy update effective 06/01/2026 to clarify that DBS and cortical stimulation for OCD (and for indications not listed elsewhere in the policy as proven and medically necessary) do not meet the threshold for medical necessity based on the current evidence base.

The policy notes that HCPCS code L8680 (implantable neurostimulator electrode, each) is not on the State of Idaho Medicaid Fee Schedule and therefore may not be covered by the Idaho Medicaid Program; providers should consult the Idaho Medicaid Provider Handbook for non-covered and excluded services when billing.

Separately, consistent with guidance from NICE, the policy indicates that DBS for chronic, severe, treatment‑resistant OCD should be limited to use within the context of research, with patient selection and procedures performed only by multidisciplinary teams in centers experienced with DBS.

Use of deep brain stimulation or cortical stimulation for obsessive‑compulsive disorder is described in the policy as unproven and not medically necessary. The documentation cites insufficient evidence of efficacy from available studies and emphasizes the need for additional high‑quality research to establish safety, efficacy, and long‑term outcomes.

The policy language reiterates that DBS and cortical stimulation are not covered for OCD except in circumstances where an indication is explicitly listed as proven and medically necessary or where care is provided as part of an approved research protocol.

Policy revisions effective 06/01/2026 added clarifying language that deep brain stimulation and/or cortical stimulation are unproven and not medically necessary for treating obsessive‑compulsive disorder and for all other indications not listed in the policy as proven and medically necessary.

The update also aligns the policy with external guidance (for example, NICE), which recommends that DBS for chronic, severe, treatment‑resistant OCD be performed only in research settings with multidisciplinary selection and in centers with DBS expertise.

Applicable Procedure and Product Codes

Applicable CPT CodesCPT

61850	Twist drill or burr hole(s) for implantation of neurostimulator electrodes, cortical.
61860	Craniectomy or craniotomy for implantation of neurostimulator electrodes, cerebral, cortical.
61863	Twist drill, burr hole, craniotomy, or craniectomy with stereotactic implantation of neurostimulator electrode array in subcortical site; first array.
61864	Twist drill, burr hole, craniotomy, or craniectomy with stereotactic implantation of neurostimulator electrode array in subcortical site; each additional array.
61867	Twist drill, burr hole, craniotomy, or craniectomy with stereotactic implantation of neurostimulator electrode array in subcortical site with intraoperative microelectrode recording; first array.
61868	Twist drill, burr hole, craniotomy, or craniectomy with stereotactic implantation of neurostimulator electrode array in subcortical site with intraoperative microelectrode recording; each additional array.
61885	Insertion or replacement of cranial neurostimulator pulse generator or receiver; with connection to a single electrode array.
61886	Insertion or replacement of cranial neurostimulator pulse generator or receiver; with connection to 2 or more electrode arrays.
61889	Insertion of skull-mounted cranial neurostimulator pulse generator or receiver, including craniectomy or craniotomy, with connection to depth and/or cortical strip electrode array(s).
61891	Revision or replacement of skull-mounted cranial neurostimulator pulse generator or receiver with connection to depth and/or cortical strip electrode array(s).

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Applicable HCPCS CodesHCPCS

L8679	Implantable neurostimulator, pulse generator, any type.
L8680	Implantable neurostimulator electrode, each.
L8682	Implantable neurostimulator radiofrequency receiver.
L8685	Implantable neurostimulator pulse generator, single array, rechargeable, includes extension.
L8686	Implantable neurostimulator pulse generator, single array, nonrechargeable, includes extension.
L8687	Implantable neurostimulator pulse generator, dual array, rechargeable, includes extension.
L8688	Implantable neurostimulator pulse generator, dual array, nonrechargeable, includes extension.

Applicable HCPCS considerationsHCPCS

L8680

Deep brain stimulation device (HCPCS) - noted as not on Idaho Medicaid Fee Schedule

FDA product codes for DBS devices (informational)mixed

MHY	DBS device product code (FDA informational reference)
NHL	DBS device product code (FDA informational reference)
OLM	DBS device product code (FDA informational reference)
OLX	DBS device product code (FDA informational reference)

FDA product code for responsive cortical devices (informational)mixed

PFN	Responsive cortical device product code (FDA informational reference)

Provider Responsibilities, Prior Authorization, and Documentation

Prior Authorization

Applicable codes referenced for authorization

The following procedure and HCPCS codes are provided for reference and are used for authorization and claims processing. Inclusion of a code in this list does not guarantee coverage or payment. Verify benefits and prior authorization requirements before scheduling services.

CPT codes: 61850, 61860, 61863, 61864, 61867, 61868, 61885, 61886, 61889, 61891, 64999
HCPCS codes: L8679, L8680*, L8682, L8685, L8686, L8687, L8688

Denial Risk

Idaho Medicaid coverage risk

HCPCS code L8680 ("Implantable neurostimulator electrode, each") is not on the State of Idaho Medicaid Fee Schedule and therefore may not be covered by Idaho Medicaid. Providers should consult the Idaho Medicaid Provider Handbook for non-covered and excluded services and confirm coverage with the member's plan prior to performing services that rely on this code.

Background and Rationale

Deep brain stimulation (DBS) delivers electrical pulses to targeted subcortical brain regions via implanted electrodes connected to an implantable pulse generator. Device components typically include leads placed in the brain target, subcutaneous extension wires, and the pulse generator. DBS is adjustable and reversible and is used to modulate neuronal pathways implicated in movement and other neurologic disorders.

Responsive cortical stimulation (RNS) is a closed‑loop implantable neurostimulator system that detects abnormal electrical signals and delivers stimulation to normalize activity; the neurostimulator is skull‑mounted with intracranial leads placed in areas of abnormal cortical activity.

Definitions and Evidence Terms

Deep brain stimulation (DBS) — definition and targeted areas

DefinitionDeep brain stimulation (DBS) is an implanted neurostimulation system that delivers electrical pulses to targeted subcortical brain areas via surgically implanted electrodes; device components include an implantable pulse generator (neurostimulator), implantable lead(s) with electrodes, and connecting wires.

Examples of targeted brain areasInternal globus pallidus interna (GPi); subthalamic nucleus (STN); ventral intermediate nucleus (VIM) of the thalamus.

Key device characteristicsDBS is adjustable and reversible (unlike permanent surgical ablation); the neurostimulator is typically implanted near the clavicle or in the abdomen for some patients.

Responsive cortical stimulation (RNS) — closed‑loop implantable neurostimulator

DefinitionResponsive cortical stimulation (RNS) is a closed-loop implantable neurostimulator designed to detect abnormal electrical brain signals that precede seizures and deliver stimulation in response to normalize brain activity and prevent seizures.