ModifiedUnitedHealthcarePolicy CS363PA.D

Interspinous Fusion and Decompression Devices (for Pennsylvania Only)

This policy governs coverage for interspinous fixation (fusion) devices and interspinous decompression/interlaminar stabilization devices for members in Pennsylvania; it defines when interspinous fusion is medically necessary and states that decompression/spacer devices without fusion are unproven and not medically necessary.

Policy Summary

PayerUnitedHealthcare

PolicyInterspinous Fusion and Decompression Devices (for Pennsylvania Only)

Policy CodePolicy CS363PA.D

Change TypeDefinitions and evidence references updateddocumentation language added

Effective DateJan 1, 2026

Next Review DateN/A

Key ActionObtain and retain medical record documentation showing the clinical and imaging criteria and prior nonoperative treatment to support medical necessity for prior authorization and review.

SourceLink

POLICY UPDATE CHANGES

Medical records documentation language added specifying documentation required to assess clinical criteria for coverage.

Definitions for several device- and condition-related terms were revised.

Evidence and references updated to include recent systematic reviews, HTAs, and technology assessments.

Pennsylvaniageographic applicability

L1-S1spinal levels allowed

≤ grade 1

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max spondylolisthesis

LimitedRCT availability

Higher reop riskmeta-analysis finding

Coverage Criteria for Interspinous Devices

Interspinous fixation (fusion) - medically necessary

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) No more than grade 1 spondylolisthesis; 4) Used with an interbody cage as an adjunct to fusion at a single lumbar level (L1-S1).

Coverage limited to these conditions

Interspinous decompression / interlaminar stabilization - not medically necessary

Interspinous decompression and interlaminar stabilization systems (without fusion):

Decompression/ILD/IPD coverage stance: Devices used without fusion for treatment of spine pain or spinal stenosis are unproven and not medically necessary due to insufficient/low-quality evidence and inconsistent outcomes; additional large, well-designed, long-term trials are needed to further evaluate efficacy and safety.

Multiple systematic reviews and technology assessments cited weaknesses in evidence and need for RCTs and longer follow-up.

Indications — static interspinous distraction devices

Static interspinous distraction devices (intended instead of direct decompression) may be indicated when ALL of the following are met:

Indications for static interspinous device: 1) Clinically symptomatic degenerative lumbar stenosis with neurogenic claudication that is relieved by lumbar flexion; 2) Patient can sit at least 50 minutes without pain and can walk at least 50 feet; 3) Advanced imaging (CT or MRI) demonstrates mild-to-moderate stenosis defined as a 25–50% reduction in lateral/central foraminal diameter compared to adjacent levels; 4) Failure of >= 6 months of nonoperative treatment; 5) Degenerative scoliosis <= 25 degrees; 6) Degenerative spondylolisthesis no greater than Grade I; 7) Open surgery (e.g., laminectomy) is not a medically safe treatment option because of comorbidities; 8) BMI < 40; 9) No fixed motor deficit; 10) No prior lumbar surgery at the intended levelsee accompanying thresholds

NASS 2025 coverage recommendations; static devices only when intended instead of direct decompression

Indications — interspinous fixation with fusion

Interspinous fixation devices used in conjunction with lumbar fusion may be considered when ALL of the following are met:

Indications for interspinous fixation with fusion: Device affixes to the spinous processes and is used as an adjunct in lumbar fusion for diagnoses such as stenosis, disc herniation, or synovial facet cyst when >50% of the facet joint is removed during cyst excision; used in conjunction with robust open laminar and/or facet decortication and autograft inter- and extra-spinous process decortication and/or interbody fusion of the same motion segment. Use must be accompanied by an appropriate fusion technique and open decortication of posterior bony elements as indicated.N/A

NASS 2025 coverage recommendation; avoid use in scenarios listed as not indicated (see exclusions).

Interspinous decompression and interlaminar stabilization systems used without fusion for treatment of spine pain or lumbar spinal stenosis are considered not medically necessary. The policy finds the evidence base insufficient—studies are limited in size and quality and systematic reviews and technology assessments have concluded that additional large, well‑designed, long‑term trials are needed to evaluate efficacy and safety compared with standard decompression or fusion.

Use of static interspinous distraction devices is restricted to patients meeting specific clinical and imaging criteria: symptomatic degenerative lumbar stenosis with neurogenic claudication relieved by flexion, documented ability to sit ≥ 50 minutes pain‑free and walk ≥ 50 feet, imaging demonstrating mild‑to‑moderate stenosis (25–50% reduction) in foraminal/central diameter, and failure of ≥ 6 months of nonoperative therapy. Devices are not indicated for degenerative spondylolisthesis ≥ Grade II, degenerative scoliosis > 25°, dynamic instability, symptoms not relieved by flexion, patients who are medically suitable for direct decompression, BMI ≥ 40, fixed motor deficit, or prior lumbar surgery at the intended level. For interspinous fixation used with fusion, contraindications include scenarios listed by NASS such as spondylolisthesis > Grade I, bilateral isthmic spondylolysis, significant dynamic or coronal/rotatory instability, multilevel fusion indications, and routine use at L5‑S1 unless anatomy is favorable.

Current systematic reviews, meta‑analyses, and health technology assessments conclude the body of evidence for interspinous spacers and interlaminar stabilization devices is low quality and inconsistent. Trials are generally small, at risk of bias, and lack long‑term comparative data; available analyses report no clear superiority over decompression and signal higher reoperation rates in some studies. Therefore, interspinous decompression and interlaminar stabilization devices used without fusion are considered unproven.

Use of interspinous spacers or other interspinous devices as a substitute for standard direct decompression (e.g., laminectomy) or for fusion is not supported when comparative evidence does not demonstrate similar safety and effectiveness. Available reviews note higher reoperation risk and limited long‑term outcomes versus decompression or fusion; therefore substitution of spacers for standard decompression or fusion is generally considered not medically necessary unless the patient meets the specific indications and selection criteria outlined for static devices or there is clear supporting documentation.

Coding and Key Thresholds

Referenced 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)

Referenced CPT CodesCPT

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 decompression, 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]

Nonoperative treatment duration

Required durationFailure of nonoperative treatment for at least 6 months prior to consideration of static interspinous distraction device implantation.

ContextApplies to static interspinous distraction devices used instead of direct decompression per NASS 2025 recommendations.

Documentation implicationMedical record must document conservative care attempts and duration to support meeting the 6-month requirement.

Walking/sitting functional thresholds for neurogenic claudication

Sitting thresholdPatient can sit for at least 50 minutes without pain.

Walking threshold

Provider Actions, Prior Authorization, and Documentation

Prior Authorization

Prior Authorization and Applicable Codes

Prior Authorization Required: Requests for Interspinous fixation devices performed with fusion (interspinous fixation as an adjunct to lumbar fusion) must follow UnitedHealthcare prior authorization processes. Applicable CPT/HCPCS/other codes may be referenced on the prior authorization submission. Failure to obtain prior authorization when required may result in denial or delayed payment.

Applicable codes may include, but are not limited to: 22853, 22854, 22859, 22867-22870, 22899.

Documentation Required

Medical Records and Supporting Documentation

Medical records and supporting documentation may be requested to verify that the clinical criteria for coverage are met. Documentation must be legible, maintained in the patient’s medical record, and made available upon request. Medical records requested for review may include, but are not limited to:

Relevant medical history and physical examination notes

Definitions and Device Types

Interspinous Fixation Devices definition

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

Use contextUsed as an adjunct in lumbar fusion procedures (e.g., with open decortication and interbody fusion) per NASS guidance.

Distinguishing featureDesigned to affix to spinous processes to provide stabilization to promote bone fusion, unlike stand-alone spacers that aim for indirect decompression.

Interspinous Process Decompression (IPD) definition

DefinitionMinimally invasive procedure that implants a spacer between adjacent spinous processes to distract the neural foramen and decompress nerves; intended to block stenosis-related lumbar extension.

Device behavior

Background

Lumbar spinal stenosis (LSS) is narrowing of the lumbar spinal canal that can compress neural elements and cause back and leg pain with neurogenic claudication. Surgical treatment options include direct decompression (laminectomy) with or without fusion. Interspinous devices were developed as less‑invasive alternatives; interspinous fixation devices are intended as adjuncts to promote fusion when used with interbody cages, while interspinous spacers / interlaminar stabilization devices are intended to provide indirect decompression by limiting extension. Clinical recommendations and device labeling differ by device type, and patient selection criteria (imaging severity, functional thresholds, prior nonoperative treatment, and anatomic/instability exclusions) are required to identify appropriate candidates.

Policy Summary

PayerUnitedHealthcare

PolicyInterspinous Fusion and Decompression Devices (for Pennsylvania Only)

Policy CodePolicy CS363PA.D

Change TypeDefinitions and evidence references updateddocumentation language added

Effective DateJan 1, 2026

Next Review DateN/A

Key ActionObtain and retain medical record documentation showing the clinical and imaging criteria and prior nonoperative treatment to support medical necessity for prior authorization and review.

SourceLink

On This Page

Patient can walk at least 50 feet (neurogenic claudication functional threshold).

Symptom characteristicSymptoms are relieved by lumbar flexion (flexion-provoked neurogenic claudication).

Imaging stenosis severity definitions

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

Imaging modalitiesAssessment based on advanced imaging (CT or MRI).

ApplicationThreshold applies to static interspinous distraction devices intended as an alternative to direct decompression.

Scoliosis and spondylolisthesis limits

Degenerative scoliosis limitDegenerative scoliosis must be ≤ 25° to qualify for static interspinous distraction device use.

Spondylolisthesis limitDegenerative spondylolisthesis must be Grade I or less (≤ Grade I) for static devices; interspinous fixation with fusion also limited to ≤ Grade I.

Fusion contraindicationsInterspinous fixation devices with fusion should not be used for spondylolisthesis > Grade I, bilateral isthmic spondylolysis, significant dynamic or coronal/rotatory instability, or multilevel fusion indications.

BMI exclusion threshold

BMI exclusionBMI ≥ 40 is listed as a contraindication for static interspinous distraction devices (not indicated).

ImplicationPatients with BMI ≥ 40 do not meet selection criteria for static interspinous devices per NASS 2025 recommendations.

DocumentationMedical record should include height/weight and calculated BMI to demonstrate eligibility.

Pertinent diagnostic test results (e.g., MRI, CT, X-ray) demonstrating degenerative changes, stenosis, spondylolisthesis grade, or other anatomic findings

Operative reports and procedure notes (when applicable)

Documentation of conservative (nonoperative) therapies tried, duration, and response

Clinic visit notes documenting neurogenic claudication symptoms and functional limitations

Imaging reports that quantify stenosis severity and curve/spondylolisthesis measurements

Documentation Required

Medical Records Documentation Used for Reviews

Medical records documentation used for reviews: benefit coverage is determined by federal, state, or contractual requirements and applicable laws. Medical records documentation may be required to assess whether the member meets the clinical criteria for coverage but does not guarantee coverage. The patient’s medical record must contain documentation that fully supports the medical necessity for the requested services.

Documentation should include history, physical exam, and results of pertinent diagnostic tests or procedures
Records must be legible and available upon request

Note

Case-by-Case Review and Pennsylvania Exceptions

Case-by-case review may be performed for requests that fall outside the policy’s stated criteria, or for members in Pennsylvania where the policy is applied only to that state. Pennsylvania exceptions (Pennsylvania Code, Title 55, Chapter 1101) may require individualized consideration.

Requests not meeting the policy criteria will be evaluated on a case-by-case basis for members in Pennsylvania

Step Therapy

Conservative Therapy Prerequisite

Conservative Therapy Prerequisite: Prior to consideration of interspinous distraction devices (without fusion) for degenerative lumbar stenosis, documentation must show failure of at least 6 months of nonoperative treatment.

Nonoperative treatments may include physical therapy, activity modification, analgesic medications, epidural steroid injection(s), or other appropriate conservative measures
Records should document type of therapy, duration (≥ 6 months), and the clinical response

Denial Risk

Contraindications / Not Indicated (Denial Risk)

Contraindicated or Not Indicated Scenarios (Denial Risk): Interspinous fixation or distraction devices should not be used in scenarios listed below. Requests for these indications are at high risk for denial.

Spondylolisthesis greater than Grade I (Grade II or higher)
Bilateral isthmic spondylolysis
Significant dynamic instability (e.g., on flexion-extension views)
Scoliosis greater than indicated (degenerative scoliosis >25° or signs of coronal/rotatory instability)
Fusion indicated at more than one lumbar level
Complete resection of the facet (unless accompanied by interbody fusion)
Patient medically suitable for direct decompressive surgery (e.g., laminectomy) — if so, interspinous distraction devices are not indicated
Primarily axial back pain unrelated to activity (discogenic low back pain)
BMI ≥ 40 (for interspinous distraction devices)
Fixed motor deficit
Prior lumbar surgery at the intended level
Procedures at L5–S1 are generally not indicated for ISPD due to anatomical limitations (may be considered only with favorable anatomy)

Spacers are opened or expanded after implantation to provide dynamic stabilization; dynamic devices per FDA labeling are intended to be used with direct decompression.

Clinical roleUsed for relief of neurogenic claudication when conservative measures have failed, per IPD description.

Lumbar Spinal Stenosis (LSS) definition

DefinitionNarrowing or constriction of the lumbar spinal canal that may result in painful compression of nerve and/or blood vessels supplying the nerve(s), often causing neurogenic claudication.

Clinical consequenceMay produce leg and back pain and neurogenic claudication relieved by flexion.

RelevanceDefines the target condition for interspinous devices and guides selection criteria (imaging and functional thresholds).

Interlaminar Stabilization Device definition

DefinitionAn implantable device intended to provide symptomatic relief of claudicatory LSS by reducing lumbar extension while preserving flexion and rotation; typically implanted after decompression at affected levels.

MechanismReduces extension to relieve symptoms while aiming to preserve other ranges of motion; often implanted following decompression.

DistinctionInterlaminar stabilization devices differ from fixation devices in that they are intended to provide symptomatic relief rather than to promote fusion.

Interspinous fixation/Interlaminar stabilization device (combined)

DefinitionDevices that affix to spinous processes to provide stabilization; may be used as adjuncts in lumbar fusion procedures or, in some cases, as standalone spacers intended to provide indirect decompression.

NASS noteNASS recommends fixation devices be used with open decortication and fusion procedures; literature does not support fixation without open decortication and fusion of posterior elements or interbody fusion.

Use distinctionTerm covers both interspinous fixation (for fusion adjunct) and interlaminar stabilization (symptom relief) depending on device design and intended use.

Static (nonflexible/noncompressible) interspinous device definition

DefinitionA static (nonflexible, noncompressible) interspinous device intended to provide indirect decompression and to be used instead of a direct decompressive procedure.

NASS applicabilityNASS 2025 coverage recommendations for static devices apply only when the device is intended as an alternative to direct decompression.

Selection criteriaUse limited to patients meeting strict criteria (e.g., symptomatic stenosis relieved by flexion, mild-to-moderate stenosis on imaging, failure of ≥6 months nonoperative care).