CurrentPremera BluecrossPolicy 7.01.591

MEDICAL POLICY 7.01.591 Interspinous Fixation (Fusion) Devices

Defines the insurer's coverage position for interspinous fixation (fusion) devices (IFDs), including investigational status for all indications, examples of devices, coding guidance, regulatory status, and background evidence considerations. Applies to medical necessity determinations (not Medicare Advantage).

Policy Summary

PayerPremera Bluecross

PolicyMEDICAL POLICY 7.01.591 Interspinous Fixation (Fusion) Devices

Policy CodePolicy 7.01.591

Change TypeAnnual review; renumbering; documentation clarification

Effective DateJul 1, 2025

Next Review Date

Key ActionInclude the name of the specific fixation device used in clinical documentation and consult member benefit booklet or customer service for coverage determinations since IFDs are considered investigational for any indication.

SourceLink

POLICY UPDATE CHANGES

Policy renumbered from 7.01.138 to 7.01.591 and updated with literature review through March 2, 2024 (history entry 07/01/24).

Annual Review updated with literature review through February 24, 2025; reference added (approved June 23, 2025; effective July 1, 2025).

Added note that device name should be included in clinical documentation (noted in 11/10/15 history).

Examples of investigational devices and appendix of stand-alone spine cages expanded (10/01/22 and appendices).

InvestigationalCoverage Status

Multiple 510(k)Regulatory Clearance

Coverage Summary

Interspinous fixation devices (IFDs) are considered investigational for any indication. The policy explicitly states that IFDs are investigational whether used in combination with interbody fusion or alone for decompression in individuals with spinal stenosis.

IFDs are intended to be used as an adjunct to interbody fusion to stabilize the spine and promote fusion; use of an IFD as a stand-alone decompression (without concurrent interbody fusion) is off-label and considered investigational.

Scope: This policy defines the insurer's coverage position for IFDs and applies to medical necessity determinations. It does not apply to Medicare Advantage.

Medical Necessity / Investigational Determination

Interspinous fixation (fusion) devices are considered investigational for any indication.

ALL of the following

Interspinous fixation (fusion) devices (IFDs) are considered investigational for any indication, including but not limited to use in combination with interbody fusion or used alone for decompression in individuals with spinal stenosis.
Supported by policy coverage statement and summaries of evidence.
Use of IFDs as a stand-alone procedure (without interbody fusion) is considered off-label and investigational.
Policy and regulatory status note that stand-alone use is off-label and evidence is insufficient.
Examples of investigational devices are listed in the policy appendix but the list is not exhaustive.
Appendix lists example devices and policy states list may not be exhaustive.

Potential Exceptions / Clinical Input

Clinical input noted potential exceptions but did not change the policy conclusion that IFDs are investigational.

ANY of the following

Clinical input example: Physician specialty input cited potential situations where devices might be considered medically necessary, for example individuals with small pedicles where pedicle screws could not be safely placed.
Clinical input documented in policy review and coding section.
NASS position: North American Spine Society (2019) coverage position: interspinous fixation with fusion may be considered when used in the context of lumbar fusion procedures for diagnoses including excision >50% of a facet joint and when utilized with robust open laminar and/or facet decortication and fusion and/or interbody fusion of the same motion segment; however, the policy conclusion remains that IFDs are investigational.
Position statement included in policy; does not alter investigational determination.

Provider Actions & Billing Impact

Documentation Required

Document device name

Clinical documentation should include the specific fixation device name used for the procedure.

Include device model/name in operative report.

Prior Authorization

Prior authorization / medical necessity review

Interspinous fixation devices are considered investigational for any indication and claims for procedures using these devices are subject to denial unless an approved exception is documented and authorized.

Consult the member benefit booklet or contact customer service to determine coverage and prior authorization requirements.

Coding

HCPCS / Supply Codes (historical changes noted)HCPCS

C1831

Historically added 10/01/21 then removed 12/01/21 (coding note).

Background & Evidence Summary

IFDs are intended as alternatives to pedicle screw and rod constructs and are typically used as an adjunct to interbody fusion; evidence includes small randomized controlled trials, nonrandomized comparative studies, and case series, but is insufficient to demonstrate a net health benefit. Reported risks include spinous process fracture and uncertain comparative safety versus pedicle screw-rod fixation. Use as a stand‑alone decompression device is off‑label and unsupported by adequate evidence.

Evidence type	Summary
Randomized controlled trials	Two small RCTs evaluated IFDs used with interbody fusion; trials had methodological limitations and limited follow-up and found comparable benefits to pedicle-screw constructs but unclear comparative safety; evidence insufficient to demonstrate net health benefit.
Stand-alone IFD evidence	Evidence includes a small RCT and retrospective series evaluating IFDs as stand-alone decompression; data are limited and insufficient to determine benefit.
Ongoing trial NCT06335511	Planned enrollment 100; estimated completion Feb 2025; trial may influence policy when published.

Interspinous fixation devices (IFDs): Devices attached to spinous processes to rigidly stabilize the spine, typically used as part of fusion surgery to promote stabilization while bone graft fuses vertebrae.

Stand-alone use: Use of an IFD without concurrent interbody fusion, typically intended for decompression; considered off-label.

Revision History

11/10/15clarified

Added note that the name of the specific fixation device used for the procedure should be included in clinical documentation (documentation clarification).

10/01/22added

Examples of investigational devices expanded and appendix of stand-alone spine cages added/expanded for informational purposes; policy conclusion unchanged.

07/01/24revised

Policy renumbered from 7.01.138 to 7.01.591 and updated with literature review through March 2, 2024 (history entry 07/01/24); policy statement unchanged.