ModifiedUnitedHealthcarePolicy CS363NJ.C

Interspinous Fusion and Decompression Devices (for New Jersey Only)

Medical policy governing use of interspinous fixation (fusion) and interspinous decompression/interlaminar stabilization devices for lumbar spine conditions in New Jersey members of UnitedHealthcare.

Policy Summary

PayerUnitedHealthcare

PolicyInterspinous Fusion and Decompression Devices (for New Jersey Only)

Policy CodePolicy CS363NJ.C

Change TypeRevised coverage languageclarified noncoverage and updated codes

Effective DateJun 1, 2025

Next Review Date

Key ActionSubmit prior authorization with supporting documentation demonstrating diagnosis, radiographic confirmation, level(s) L1–S1 and that interspinous fixation will be used adjunctively with interbody fusion when applicable.

SourceLink

POLICY UPDATE CHANGES

Replaced language indicating 'Interspinous bony fusion devices are proven and medically necessary' with 'Interspinous Fixation (fusion) Devices are proven and medically necessary'.

Replaced 'Interspinous decompression systems (without fusion) for the treatment of spine pain or spinal stenosis are unproven and not medically necessary' with 'interspinous decompression and Interlaminar Stabilization systems (without fusion) for the treatment of spine pain or spinal stenosis are unproven and not medically necessary'.

Removed HCPCS code C1821 from Applicable Codes.

Updated Supporting Information sections: Description of Services, Clinical Evidence, FDA, and References to reflect current information.

L1-S1spinal levels allowed

≤ grade 1max spondylolisthesis

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22867-22870...listed codes

06/01/2025policy revision

Coverage Criteria — Interspinous Fixation and Decompression Devices

inv-01: Interspinous fixation (fusion) — medical necessity

Interspinous fixation (fusion) devices are covered when ALL of the following are met:

Interspinous fixation coverage criteria: 1) Performed according to FDA labeled indications, contraindications, warnings, and precautions; 2) Back pain of discogenic origin with degeneration of the disc confirmed by history and radiographic studies; 3) Used with an interbody cage as an adjunct to fusion at a single lumbar level (L1-S1); 4) No more than grade 1 spondylolisthesis.

From policy Coverage Rationale; definitions of devices and arthrodesis provided in policy.

inv-02: Interspinous decompression / interlaminar stabilization (without fusion) — not medically necessary

Interspinous decompression and interlaminar stabilization systems (without fusion):

Interspinous decompression stance: These devices when used without fusion are considered unproven and not medically necessary due to insufficient evidence of efficacy, concerns about higher reoperation rates, and inconsistent benefit compared with decompression or fusion in the literature.

Based on policy evidence summaries and systematic reviews.

inv-03: Interspinous Fixation (fusion) - Covered with criteria

Policy coverage stance as summarized in revisions and supported by NASS recommendations

Interspinous Fixation (fusion) Devices - coverage: Interspinous Fixation (fusion) Devices are proven and medically necessary when used in the context of lumbar fusion procedures with robust posterior decortication and/or interbody fusion for indications such as stenosis, disc herniation, or synovial facet cysts requiring greater than 50% facet joint removal.

Reflects NASS 2019 coverage position and policy revision language.

inv-04: Interspinous Decompression / Interlaminar Stabilization - Not medically necessary

Devices without fusion and interlaminar stabilization systems are considered unproven and not medically necessary for spine pain or spinal stenosis

Interspinous Decompression / Interlaminar Stabilization (without fusion) - Not medically necessary: Interspinous decompression and interlaminar stabilization systems used without fusion are unproven and not medically necessary for the treatment of spine pain or spinal stenosis.

Payer policy statement; NASS 2018 conditional recommendations are informational only and do not change payer NMN stance.

inv-05: NASS conditional recommendations (informational)

NASS 2018 conditional indications when considering interspinous device without fusion in conjunction with laminectomy (informational):

NASS conditional criteria for non-fusion interspinous device with decompression: May be indicated as an alternative to lumbar fusion for degenerative lumbar stenosis with or without low-grade spondylolisthesis when all of the following apply: (1) lumbar fusion would otherwise be indicated post-decompression for a diagnosis of lumbar stenosis with Grade 1 degenerative spondylolisthesis; (2) previous lumbar fusion has not been performed at an adjacent segment; (3) lumbar laminectomy is indicated per NASS recommendations.anterolisthesis <= 3 mm

Informational guidance from NASS 2018; payer maintains noncoverage for non-fusion devices.

The policy considers use of interspinous decompression and interlaminar stabilization systems without fusion to be unproven for treatment of spine pain or lumbar spinal stenosis. These systems, when implanted without concurrent fusion, lack sufficient evidence of long‑term efficacy and have been associated with higher reoperation rates and inconsistent benefit compared with standard decompression or fusion; therefore they are not considered medically necessary under this policy.

This policy was revised effective 06/01/2025. As part of the update the terminology was clarified to use "Interspinous Fixation (fusion) Devices" and the list of applicable codes was updated by removing HCPCS code C1821 from the applicable codes list; the prior archived policy version CS363NJ.B was replaced.

Interspinous decompression devices (spacers) used alone are considered not medically necessary due to insufficient and low‑quality evidence. Systematic reviews and randomized trials report low overall quality, higher reoperation rates, and no clear long‑term advantage compared with conventional decompression or fusion, indicating the evidence is inadequate to support their use as standalone decompression therapy.

Interspinous decompression and interlaminar stabilization systems placed without fusion are explicitly designated as not medically necessary for treatment of spine pain or spinal stenosis. Although NASS (2018) offers conditional recommendations in limited circumstances when used with decompression, this policy affirms a noncoverage stance for devices implanted without fusion.

Applicable Codes and Coding Notes

Applicable CPT CodesCPT

22853	Insertion of interbody biomechanical device(s) (e.g-, synthetic cage, mesh) with integral anterior instrumentation for device anchoring (e.g., screws, flanges) , when performed; to intervertebral disc space in conjunction with interbody arthrodesis, each interspace (List separately in addition to code for primary procedure).
22854	Insertion of intervertebral biomechanical device(s) (e.g,, synthetic cage, mesh) with integral anterior instrumentation for device anchoring (e.g-, screws, flanges) , when performed; to vertebral corpectomy(ies) (vertebral body resection, or complete) defect; in conjunction with interbody arthrodesis, each contiguous defect (List separately in addition to code for primary procedure) partial.
22859	Insertion of intervertebral biomechanical device(s) (e.g., synthetic cage, mesh, methylmethacrylate) to intervertebral disc space or vertebral body defect without interbody arthrodesis, each contiguous defect (List separately in addition to code for primary procedure).
22867	Insertion of interlaminarlinterspinous process stabilization/distraction device, without fusion, including image guidance when performed, with open decompression, lumbar; single level.
22868	Insertion of interlaminarlinterspinous process stabilization/distraction device, without fusion, including image guidance when performed, with open decompression; lumbar; second level (List separately in addition to code for primary procedure).
22869	Insertion of interlaminarlinterspinous process stabilization/distraction device, without open decompression or fusion, including image guidance when performed, lumbar; single level

Additional CPT / UnlistedCPT

22870	Insertion of interlaminarlinterspinous process stabilization/distraction device, without open decompression or fusion, including image guidance when performed; lumbar; second level (List separately in addition to code for primary procedure).
22899	Unlisted procedure, spine [when specified as insertion of a non-pedicle interspinous process fixation device]

Applicable/Removed HCPCS CodesHCPCS

C1821

Removed from Applicable Codes list

Anterolisthesis for low-grade spondylolisthesis — radiographic threshold

Radiographic thresholdAnterolisthesis ≤ 3 mm on lateral radiograph

Applicable spondylolisthesis gradeLow-grade (Grade 1) or less

ContextUsed to qualify patients for interspinous device without fusion in conjunction with laminectomy per NASS 2018 guidance

Prior Authorization, Documentation, and Billing Guidance

Prior Authorization

Prior Authorization Required

Prior authorization is required for listed interspinous fixation (fusion) device procedures. If prior authorization is not obtained when applicable, services may be denied.

Affected codes: see Applicable Codes in policy (removed HCPCS C1821 previously).
Prior auth applies to interspinous fixation (fusion) devices used as adjuncts to fusion at a single lumbar level (L1–S1).

Note

Use Context and Sequencing

Interspinous fixation (fusion) devices are considered proven and medically necessary only when all FDA-labeled indications, contraindications, warnings, and precautions are followed and documentation supports the coverage criteria (see Required Clinical Documentation callout). Interspinous decompression and interlaminar stabilization systems without fusion are unproven and not medically necessary; prior authorization does not make these clinically indicated.

Fusion use context: must be used with an interbody cage as an adjunct to fusion at a single lumbar level (L1–S1).

Background and Supporting Information

Lumbar spinal stenosis and degenerative disc disease can produce neurogenic claudication, leg pain, and axial back pain. Surgical management options include decompression procedures (laminectomy) with or without concurrent fusion. Interspinous fixation (fusion) devices are intended to be attached to the spinous processes to promote stabilization and facilitate arthrodesis when used as an adjunct to lumbar fusion with appropriate posterior decortication and/or interbody fusion. In contrast, interspinous decompression (spacer) devices are minimally invasive implants placed between lamina and spinous processes to distract and decompress neural elements; however, their long‑term effectiveness and higher observed rates of reoperation have been questioned in the literature, and they are not supported as standalone fusion alternatives by this policy.

Key Definitions

Arthrodesis

DefinitionA surgical procedure to eliminate motion in a joint by providing a bony fusion; used to relieve pain, provide stability, correct deformity, or halt disease.

PurposeRelieve pain and provide stability in the spine by achieving bony fusion across motion segments.

Typical useApplied in lumbar fusion procedures where motion elimination is necessary (e.g., stenosis, deformity).

Interlaminar Lumbar Instrumented Fusion (ILIF)

DefinitionSurgical procedure involving decompression, placement of autograft/allograft bone between spinous processes, and insertion of an implant to stabilize the spine until fusion occurs.

Procedure elementsMay include decompression, bone grafting, and implant insertion between adjacent spinous processes.

Policy Summary

PayerUnitedHealthcare

PolicyInterspinous Fusion and Decompression Devices (for New Jersey Only)

Policy CodePolicy CS363NJ.C

Change TypeRevised coverage languageclarified noncoverage and updated codes

Effective DateJun 1, 2025

Next Review Date

SourceLink

On This Page

Non-fusion devices (interspinous decompression/interlaminar stabilization) are considered not medically necessary for spine pain or spinal stenosis.

Denial Risk

Denial Risk if Criteria Not Met

Denial risk is elevated if documentation does not clearly demonstrate that device use met the policy criteria: lack of radiographic confirmation of disc degeneration, absence of documentation that the device was used as an adjunct to fusion at a single level, more than Grade 1 spondylolisthesis, or use of non-fusion devices for indications deemed not medically necessary.

Denial risk applies when interspinous devices are used without documented fusion when fusion is required.
Denial risk for non-fusion devices used to treat spine pain or spinal stenosis (these are unproven/not medically necessary).

Documentation Required

Required Clinical Documentation

Required clinical documentation must be submitted with prior authorization requests and claims to demonstrate medical necessity. Incomplete documentation may result in denial or delay.

Diagnosis with clinical history supporting discogenic back pain or other qualifying diagnosis (e.g., stenosis, facet cyst)
Radiographic confirmation of disc degeneration or other relevant imaging (level-specific, showing pathology between L1–S1)
Operative plan documenting use of the interspinous fixation device as an adjunct to fusion at a single level and that no more than Grade 1 spondylolisthesis is present
Documentation of prior conservative therapy attempts when applicable and rationale for proceeding to fusion and device use
If significant mechanical back pain is cited (for non-fusion devices), documentation distinguishing mechanical back pain from neurogenic claudication and showing why decompression alone is unlikely to improve pain

Step Therapy

Step / Alternative Therapy Considerations

Step/alternative therapy considerations should follow guideline-based care and NASS recommendations. Non-fusion interspinous devices are not substitutes for indicated fusion when fusion criteria are met.

Ensure lumbar fusion is indicated post-decompression for degenerative lumbar stenosis with Grade 1 degenerative spondylolisthesis per NASS before choosing a device-based alternative.
Confirm no prior fusion at an adjacent segment when considering stabilization alternatives.
Document that lumbar laminectomy indications are met per NASS when considering interspinous devices with decompression as an alternative to fusion.

Indication rangeUsed as part of posterior fusion strategies for lumbar pathology when stabilization and fusion are required (L1-S1).

Interspinous Fixation Devices

DefinitionDevices intended for attachment to the spinous processes to achieve stabilization and promote fusion in patients with degenerative disc disease.

MechanismProvide posterior stabilization to promote bony fusion when used adjunctively with decortication/interbody fusion.

Use contextIntended to be used as adjuncts to lumbar fusion procedures (not as standalone fixation without fusion).

Interspinous Process Decompression (IPD)

DefinitionMinimally invasive implantation of a spacer between adjacent lamina and spinous processes to distract and decompress neural elements in lumbar spinal stenosis.

PurposeDistracts spinous processes to limit extension and relieve stenosis-related nerve compression symptoms.

Note on evidenceUsed without fusion; policy characterizes standalone IPD devices as having insufficient long-term evidence and higher reoperation rates relative to decompression or fusion.

Lumbar Spinal Stenosis (LSS)

DefinitionNarrowing of the lumbar spinal canal that may compress nerves and cause pain, neurogenic claudication, and neurologic deficits.

Common symptomsNeurogenic claudication: leg/buttock pain or weakness worsened by standing/walking and relieved by flexion or rest.

Relevance to devicesLSS is a primary indication considered when evaluating decompression, fusion, or interspinous device use; policy distinguishes fusion adjunct devices (covered) from non-fusion decompression devices (not medically necessary).

Interspinous fixation with fusion

DefinitionInterspinous fixation with fusion: use of an interspinous fixation device as an adjunct to lumbar fusion procedures with robust posterior decortication and/or interbody fusion to promote stabilization and bony fusion.

NASS positionNASS (2019) supports consideration of interspinous fixation when used in the context of lumbar fusion and open decortication; no support for fixation without fusion.

IndicationsMay be used for diagnoses such as stenosis, disc herniation, or synovial facet cysts requiring substantial facet removal (>50%).

Interspinous decompression / Interlaminar Stabilization

DefinitionInterspinous decompression / Interlaminar Stabilization (without fusion): devices placed without fusion intended to provide indirect decompression or stabilization (spacers or interlaminar implants).

Policy stanceConsidered unproven and not medically necessary when used without fusion for treatment of spine pain or spinal stenosis.

NASS notes (informational)NASS (2018) provided conditional recommendations for use of an interspinous device without fusion in conjunction with laminectomy under strict criteria, but payer policy designates noncoverage for standalone non-fusion devices.