ModifiedUnitedHealthcarePolicy CS363NM.C

Interspinous Fusion and Decompression Devices (for New Mexico Only)

This policy governs medical necessity and coverage for interspinous fixation (fusion) devices and interspinous decompression/interlaminar stabilization devices used in the lumbar spine for UnitedHealthcare members in New Mexico.

Policy Summary

PayerUnitedHealthcare

PolicyInterspinous Fusion and Decompression Devices (for New Mexico Only)

Policy CodePolicy CS363NM.C

Change TypeClinical evidence and documentation updates

Effective DateJan 1, 2026

Next Review Date

Key ActionProvide complete medical records documenting history, exam, diagnostic imaging and 6 months of failed conservative therapy to support authorization requests.

SourceLink

POLICY UPDATE CHANGES

Medical records documentation requirements for coverage reviews were added, including that documentation must fully support medical necessity and be made available upon request.

Definitions were updated for Arthrodesis, Interlaminar Lumbar Instrumented Fusion (ILIF), Interlaminar Stabilization Device, and Neurogenic Claudication.

Clinical evidence and references sections were updated to reflect current literature and assessments (ECRI, Hayes, NASS and recent trials/reviews).

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

Archived previous policy version CS363NM.B.

single-statepolicy applies to

grade 1maximum spondylolisthesis allowed

Trek Health ingests and normalizes Transparency in Coverage data and payer policy updates to give provider organizations a clear view of how commercial reimbursement behaves across markets, payers, and services. Our platform transforms raw payer disclosures into structured intelligence that supports contract evaluation, payer negotiations, and service line strategy. By combining market benchmarks with ongoing policy visibility, Trek helps teams identify variability, risk, and opportunity in commercial reimbursement. The result is faster insight, stronger negotiating positions, and more informed financial decisions.

lumbar levels referenced

evidence & referencessections revised

CS363NM.Bprior version archived

Coverage Criteria for Interspinous Devices

Medically Necessary: Interspinous Fixation Devices (as adjunct to fusion)

Interspinous Fixation (fusion) Devices are proven and medically necessary when performed according to U.S. Food and Drug Administration (FDA) labeled indications, contraindications, warnings, and precautions and ALL of the following are met:

Coverage criteria for interspinous fixation devices: Back pain of discogenic origin, with degeneration of the disc confirmed by history and radiographic studies.

Spondylolisthesis limit: No more than Grade I spondylolisthesis at the intended level.<= Grade I

Use with fusion and levels: Device is used with an interbody cage as an adjunct to fusion at a single lumbar level (L1–S1).single level (L1-S1)

Devices must be used per FDA labeled indications, contraindications, warnings, and precautions.

Indications for interspinous fixation devices (with fusion)

Interspinous devices affixed to spinous processes used with fusion may be considered when ALL the following are met:

Context of use: Device is utilized in the context of lumbar fusion procedures for diagnoses including stenosis, disc herniations, or synovial facet cysts, and as an adjunct when greater than 50% of the facet joint is removed during cyst excision.

NASS 2025: use only alongside robust fusion/decortication or interbody fusion.

Required fusion technique: Used in conjunction with robust open laminar and/or facet decortication and fusion, and/or robust autograft inter‑ and extra‑spinous process decortication and fusion, or with interbody fusion of the same motion segment.

No literature supports use without open decortication and fusion or interbody fusion (NASS).

Indications for interspinous distraction devices (without fusion)

Interspinous distraction (static) devices without fusion may be indicated when ALL of the following criteria are met:

Primary diagnosis and imaging: Clinically symptomatic degenerative lumbar stenosis associated with neurogenic claudication that is relieved by lumbar flexion; advanced imaging (CT or MRI) demonstrates mild to moderate stenosis defined as a 25–50% reduction in lateral or central foraminal diameter compared to adjacent levels.imaging 25-50%

Functional criteria: Patient can sit for at least 50 minutes without pain and can walk at least 50 feet.sit >=50 minutes; walk >=50 feet

Conservative therapy prerequisite: Failure of at least 6 months of nonoperative treatment.6 months

Evidence considerations affecting coverage

Evidence summary and coverage considerations that affect clinical interpretation and coverage decisions:

Evidence quality: Multiple health technology assessments and systematic reviews note low to limited quality of evidence, risk of bias, and the need for independent randomized trials comparing interspinous devices with standard decompression and fusion to validate long‑term outcomes.

References include ECRI and Hayes assessments.

Comparative outcomes: Some studies report similar functional outcomes for certain devices plus decompression versus decompression with fusion up to intermediate follow‑up, and versus decompression alone for shorter follow‑up periods; device use may reduce operative time and length of stay in some reports, but findings are not definitive.

Reoperation and safety concerns: Systematic reviews and trials have found higher reoperation rates and uncertain cost‑effectiveness for interspinous process devices compared with standard decompression; long‑term comparative safety and effectiveness remain uncertain.

Interspinous fixation devices intended as adjuncts to lumbar fusion (attachment to spinous processes used with an interbody cage at a single level, L1–S1) are considered medically necessary when performed in accordance with FDA labeling and when patient-specific criteria are met, including documented discogenic back pain with radiographic confirmation and no more than Grade I spondylolisthesis. By contrast, interspinous decompression and interlaminar stabilization systems used without fusion are regarded as unproven and not medically necessary for treatment of spine pain or spinal stenosis because evidence of efficacy is insufficient.

Contraindications and use-limits for interspinous fixation and distraction devices include structural or stability conditions that make these devices inappropriate or unsafe. Examples include spondylolisthesis greater than Grade I, bilateral isthmic spondylolysis, and significant dynamic instability (for example, on flexion-extension views). Additional exclusions noted by specialty guidance include scoliosis or coronal/rotatory instability, multilevel fusion indications, and cases where complete facet resection would preclude device use unless accompanied by interbody fusion. For static interspinous distraction devices without fusion, device-specific nonindications also include degenerative spondylolisthesis Grade II or higher, degenerative scoliosis > 25°, dynamic instability at the operative level, symptoms not relieved by flexion, patients medically suitable for direct decompressive procedures, BMI >= 40, fixed motor deficit, and prior lumbar surgery at the intended level.

Revision-history entries for this policy document do not introduce new coverage criteria or exclusions; they document updates to the Clinical Evidence and References sections and archive the prior policy version (CS363NM.B) but do not themselves specify additional coverage rules.

Coverage determinations using this policy must be reconciled with any applicable federal, state, or contractual benefit-plan requirements. In the event of conflict, the federal, state, or contractual requirements govern; providers and reviewers should check those governing terms before applying this policy.

Interspinous distraction (static) devices without fusion may be considered in a narrow, well-defined context: clinically symptomatic degenerative lumbar stenosis with neurogenic claudication relieved by flexion, imaging showing mild to moderate stenosis (25–50% reduction) on CT or MRI, functional criteria such as ability to sit ≥50 minutes and walk ≥50 feet, failure of 6 months of nonoperative treatment, degenerative scoliosis ≤ 25°, and spondylolisthesis ≤ Grade I. By contrast, interspinous decompression or interlaminar stabilization devices used without fusion for general spine pain or stenosis are considered not medically necessary due to insufficient evidence.

These devices are explicitly not indicated when the patient is an appropriate candidate for direct decompression (e.g., laminectomy) or when the primary problem is instability rather than focal stenosis. The policy also identifies clinical scenarios where nonfusion devices should not be used — for example, patients with primarily axial back pain unrelated to activity, fixed motor deficit, or those medically suitable for direct decompressive procedures — and notes that the overall quality of evidence for decompression-only devices is low, limiting support for broader use.

Billing and Coding

Applicable CPT Codes (part 1)CPT

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)

Applicable CPT Codes (part 2)CPT

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, partial or complete) defect, in conjunction with interbody arthrodesis, each contiguous defect (List separately in addition to code for primary procedure).
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 interlaminar/interspinous process stabilization/distraction device, without fusion, including image guidance when performed, with open decompression, lumbar; single level.
22868	Insertion of interlaminar/interspinous process stabilization/distraction device, without fusion, including image guidance when performed, with open decomposition, lumbar; second level (List separately in addition to code for primary procedure).
22869	Insertion of interlaminar/interspinous process stabilization/distraction device, without open decompression or fusion, including image guidance when performed, lumbar; single level.
22870	Insertion of interlaminar/interspinous 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]

inv-13: Nonoperative treatment duration — 6 months prerequisite

Required duration of conservative therapyFailure of 6 months of nonoperative treatment is required before considering interspinous distraction devices.

ContextApplies to interspinous distraction (static) devices used instead of direct decompression for degenerative lumbar stenosis.

DocumentationPrior authorization requests should include medical records documenting the 6-month nonoperative treatment and response.

inv-14: Walking tolerance/sitting criteria for neurogenic claudication — functional thresholds

Sitting tolerancePatient must be able to sit for at least 50 minutes without pain.

Walking tolerance

Provider Actions, Authorization & Documentation

Billing Rule

Code references for authorization and review

The following CPT and procedure codes are provided for authorization and utilization review reference only; inclusion does not imply coverage or payment. Billing and authorization reviews may reference these codes when assessing medical necessity for interspinous fixation, interbody devices, or interspinous/interlaminar stabilization/distraction procedures.

CPT/Procedure codes listed for reference during prior authorization and claims review

Prior Authorization

Prior authorization and required documentation

Prior authorization practices are not specified within this policy text; however, medical record documentation may be requested to determine whether the member meets clinical criteria. When documentation is requested, submit complete records that support medical necessity.

Definitions and Terminology

inv-56: Definition — Interspinous Fixation Devices (devices affixed to spinous processes to promote fusion)

DefinitionInterspinous Fixation Devices are implants intended for attachment to the spinous processes to achieve stabilization and promote bony fusion in patients with degenerative disc disease.

Use contextTypically used as adjuncts during lumbar fusion procedures (e.g., with interbody fusion or open decortication) rather than as standalone fixation.

Regulatory noteDevices should be used per FDA-labeled indications, contraindications, warnings, and precautions.

inv-57: Definition — Interspinous Process Decompression (IPD) procedure description

Procedure descriptionInterspinous Process Decompression (IPD) is a minimally invasive procedure that implants a spacer between affected lumbar spinous processes to distract the neural foramen and decompress nerves.

Background and Clinical Context

Lumbar spinal stenosis (LSS) is narrowing of the lumbar spinal canal that can compress neural elements and produce leg and back pain, commonly presenting as neurogenic claudication — symptoms of leg pain, weakness, or numbness that are relieved by spinal flexion or position change. Interspinous fixation devices are designed to attach to spinous processes to provide stabilization as an adjunct to fusion, whereas interspinous decompression/interlaminar stabilization devices (spacers) are intended to distract the spinous processes and provide indirect decompression for selected patients whose symptoms and imaging meet the policy’s criteria.

Policy Revision History

2026-01-01Updated Clinical Evidence and References; Definitions Revised; Archived Prior VersionLatest

Updated Clinical Evidence and References sections; updated definitions (Arthrodesis, ILIF, Interlaminar Stabilization Device, Neurogenic Claudication); archived previous policy version CS363NM.B.

2026-01-01Added Medical Records Documentation Requirements

Added language that medical records documentation may be required for reviews and must fully support medical necessity and be made available upon request.

Policy Summary

PayerUnitedHealthcare

PolicyInterspinous Fusion and Decompression Devices (for New Mexico Only)

Policy CodePolicy CS363NM.C

Change TypeClinical evidence and documentation updates

Effective DateJan 1, 2026

Next Review Date

Key ActionProvide complete medical records documenting history, exam, diagnostic imaging and 6 months of failed conservative therapy to support authorization requests.

SourceLink

On This Page

Anatomic and degenerative limits: No greater than 25° degenerative scoliosis and no greater than Grade I degenerative spondylolisthesis at the intended level.scoliosis <=25°; spondylolisthesis <= Grade I

Surgical risk justification: Open decompressive surgery (e.g., laminectomy) is not a medically safe treatment option because of the patient's comorbidities when applicable.

Patient must be able to walk at least 50 feet.

Symptom relationshipSymptoms should be neurogenic claudication that is relieved by lumbar flexion.

inv-15: Imaging-based stenosis severity — mild to moderate stenosis definition

Imaging severity definitionMild to moderate stenosis defined as a 25–50% reduction in lateral/central foraminal diameter on CT or MRI compared with adjacent levels.

ModalityAssessed on advanced imaging (CT or MRI).

Applies toStatic interspinous distraction devices used instead of direct decompression.

inv-16: Maximum degenerative scoliosis allowed for coverage

Maximum Cobb angle for degenerative scoliosisNo more than 25° of degenerative scoliosis (≤ 25°) is allowed for device indication.

RelevanceExceeds 25° is a contraindication for interspinous distraction devices.

AssessmentDegree should be determined from appropriate radiographic studies prior to authorization.

inv-17: Maximum spondylolisthesis grade allowed for coverage

Maximum spondylolisthesis gradeNo more than Grade I degenerative spondylolisthesis (≤ Grade I) for interspinous distraction devices; interspinous fixation with fusion also limited to Grade I or less.

ContraindicationGrade II or higher spondylolisthesis is not indicated for interspinous distraction devices.

Source guidanceNASS 2025 recommendations referenced for fusion-device contexts and limits.

inv-18: BMI exclusion threshold

BMI exclusion thresholdPatients with BMI ≥ 40 are not indicated for interspinous distraction devices.

ImplicationBMI ≥ 40 may trigger denial of requests for static interspinous devices.

AssessmentBMI should be documented in the medical record submitted for review.

Failure of at least 6 months of nonoperative treatment is a required clinical prerequisite for interspinous distraction devices when indicated
Advanced imaging (CT or MRI) confirming mild–moderate stenosis (25–50% reduction in lateral/central foraminal diameter) may be required to support medical necessity
Documentation should demonstrate symptoms relieved by lumbar flexion (neurogenic claudication), functional capacity (e.g., able to sit ≥50 minutes, walk ≥50 feet), and absence of contraindications such as Grade II+ spondylolisthesis or scoliosis >25°

Note

No authorization or denial criteria present

This section does not prescribe specific authorization or denial criteria or automated triggers. Absent explicit prior authorization rules here, the applicative federal, state, or contractual benefit terms govern prior authorization and coverage determinations.

No explicit authorization or denial triggers are specified in this policy section
Prior authorization requirements, if any, must be confirmed against the member’s benefit plan or applicable state/federal mandates

Documentation Required

Patient medical record and documentation requirements

Medical records documentation must fully support the medical necessity for requested services. Records should include relevant medical history, physical examination findings, and results of pertinent diagnostic tests or procedures. Documentation must be legible, maintained in the patient’s medical record, and made available upon request.

Include history, physical exam, imaging reports (CT/MRI), prior conservative treatment details and duration, and rationale if open decompression is not medically safe
Documentation may be requested during review and is required to substantiate coverage decisions based on federal, state, or contractual requirements

Denial Risk

Evidence considerations for interspinous decompression devices

Evidence for interspinous decompression devices used as adjuncts to decompression is limited; available studies are small to moderate in size and of low quality. When evaluating requests, consider the limited evidence base and whether criteria (e.g., nonoperative treatment failure, imaging-confirmed stenosis, functional improvement with flexion) are met.

Because clinical evidence is limited, requests for interspinous decompression/interlaminar stabilization without fusion should be carefully reviewed and supported by detailed documentation
Consideration of alternatives and documentation of why standard treatments (including direct decompression) are not suitable should be included

Step Therapy

Step therapy

Step therapy and specific step-therapy requirements are not addressed in this policy.

Step therapy information is not provided in this section

Note

Reference governing benefit terms and use of external tools

Coverage determinations must reference the member’s federal, state, or contractual benefit plan; in case of conflict, those requirements govern. UnitedHealthcare may also use third-party tools (e.g., InterQual) to assist in administering benefits.

Check governing benefit requirements (federal, state, or contractual) before applying policy criteria
UnitedHealthcare may utilize external criteria/tools in benefit administration

Note

Policy revision note

Policy revision notes: Clinical Evidence and References were updated and previous policy version CS363NM.B was archived. The 01/01/2026 update added language clarifying that benefit coverage is determined by federal, state, or contractual requirements and reinforced medical record documentation expectations.

01/01/2026: Medical Records Documentation Used for Reviews — added language on governing benefit requirements and documentation expectations
01/01/2026: Definitions and Supporting Information updated; prior version archived

After implantation the spacer is opened or expanded to distract (open) the neural foramen and reduce extension-related stenosis.

IndicationUsed to treat lumbar spinal stenosis when conservative measures have failed.

inv-58: Definition — Neurogenic Claudication

DefinitionNeurogenic claudication: leg pain or weakness relieved by flexion or change of position, commonly due to lumbar spinal stenosis.

Clinical signSymptoms typically improve with leaning forward or sitting and worsen with standing or walking in extension.

DifferentialShould be differentiated from vascular claudication in evaluation.

inv-59: Definition — Interlaminar Stabilization Device / Interspinous distraction device (static vs dynamic devices)

Interlaminar/Interspinous device typesInterlaminar stabilization/interspinous distraction devices are implanted between spinous processes to provide indirect decompression (static devices) or dynamic stabilization; dynamic devices per FDA labeling are intended to be used with direct decompression.

Static vs dynamicStatic (noncompressible/nonflexible) devices provide indirect decompression and may be used instead of direct decompression when criteria met; dynamic devices are labeled for use with decompression.

Implant timingSome devices are implanted after decompression; others are intended as standalone spacers depending on device labeling and clinical criteria.

inv-60: Definition — Interspinous fixation device (with fusion)

DefinitionInterspinous fixation device (with fusion): an implant affixed to spinous processes for stabilization used as an adjunct during lumbar fusion procedures and intended to be used with robust fusion techniques.

Clinical requirementNot supported for use without open decortication and fusion or interbody fusion per NASS guidance.

Typical diagnosesUsed in the context of fusion for stenosis, disc herniation, or synovial facet cysts when substantial facet resection occurs.

inv-62: Definition — Third-party criteria/tools (e.g., InterQual)

Third-party toolsUnitedHealthcare may use third-party criteria/tools (e.g., InterQual) to assist in administering benefits and prior authorization decisions.

ImplicationProviders should expect that such tools can influence review and authorization determinations.

ScopeThese tools are used in conjunction with the policy and applicable federal/state/contractual requirements.

inv-61: Reference to prior policy CS363NM.B in revision notes

Prior policy referencePrevious policy version CS363NM.B is archived and referenced in the policy revision history.

Revision contextClinical Evidence and References sections were updated and the prior version CS363NM.B archived during the 01/01/2026 revisions.

Operational notePolicy history entries repeatedly note the archival of CS363NM.B alongside updates to definitions and supporting information.

Updated Clinical Evidence and References; Archived Prior Version

Multiple policy history entries document updates to Clinical Evidence and References and note the archival of previous policy version CS363NM.B.

2026-01-01Summary of Changes Recorded Repeatedly

Revision-history entries repeatedly note the same summary: Clinical Evidence and References sections were updated and prior version CS363NM.B archived.

2026-01-01Updated Clinical Evidence and References; Archived Prior VersionLatest

Policy history entries state Clinical Evidence and References were updated to reflect current information and prior version CS363NM.B was archived.

2026-01-01Repeated Revision Notes

Multiple revision-history chunks repeat the same update summary and archival notation for CS363NM.B.

2026-01-01Archived Prior Policy Version (CS363NM.B); Updated Evidence and ReferencesLatest

Revision-history entries reference and archive prior policy CS363NM.B while noting updates to Clinical Evidence and References.

2026-01-01Multiple Archive Notations

Several policy history lines redundantly document archival of CS363NM.B alongside updated evidence sections.

2026-01-01No Coverage Criteria in Revision ChunksLatest

These revision-history entries contain no coverage criteria or exclusions; they document administrative revision-history information.

2026-01-01Added Medical Records Documentation Requirement (Operational Note)Latest

Operational update added: medical records documentation may be required to assess clinical criteria for coverage and must fully support medical necessity, be legible, and made available upon request.