CurrentUnitedHealthcarePolicy CS363PA.D

Interspinous Fusion and Decompression Devices (for Pennsylvania Only)

State-specific UnitedHealthcare medical policy for use of interspinous fixation (fusion) and interspinous decompression/interlaminar stabilization devices in Pennsylvania, defining medical necessity criteria, exclusions, documentation requirements, and applicable procedure codes.

Policy Summary

PayerUnitedHealthcare

PolicyInterspinous Fusion and Decompression Devices (for Pennsylvania Only)

Policy CodePolicy CS363PA.D

Change TypeDocumentation, Definitions, Supporting Evidence updates

Effective DateJan 1, 2026

Next Review DateN/A

Key ActionMaintain legible medical records that fully support medical necessity including relevant history, physical exam, and diagnostic test results and make them available upon request.

SourceLink

POLICY UPDATE CHANGES

Medical Records Documentation Used for Reviews language added clarifying documentation requirements and that documentation does not guarantee coverage.

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

Supporting Information: Clinical Evidence and References sections updated to reflect current information.

Added language clarifying that benefit coverage is determined by federal, state, or contractual requirements and applicable laws, and that documentation may be required but does not guarantee coverage.

Updated definitions for Arthrodesis, Interlaminar Lumbar Instrumented Fusion (ILIF), Interlaminar Stabilization Device, and Neurogenic Claudication.

Updated Clinical Evidence and References sections to reflect current information.

Archived previous policy version CS363PA.C

1Policy applies to state(s)

Coverage Summary

Scope: State-specific UnitedHealthcare medical policy for Pennsylvania covering use of interspinous fixation (fusion) devices and interspinous decompression/interlaminar stabilization devices, with applicable CPT references and documentation requirements.

Coverage stance: Mixed — interspinous fixation devices used as an adjunct to fusion are medically necessary when criteria are met; interspinous decompression/ interlaminar stabilization systems used without fusion are not medically necessary (unproven).

Geographic scope: Pennsylvania only (policy applies only to the state of Pennsylvania; exceptions evaluated case-by-case pursuant to Pennsylvania Code Title 55, Chapter 1101).

Effective / last review date: Effective January 1, 2026 (last review 01/01/2026).

Headline thresholds: coverage limited to single-level fusion L1–S1; maximum allowed spondylolisthesis of Grade I; and for static interspinous distraction devices used instead of decompression, failure of 6 months nonoperative treatment is required.

Key clinical thresholds

Nonoperative treatment durationFailure of 6 months nonoperative treatment

Degenerative scoliosis limit<= 25° (static interspinous devices)

Spondylolisthesis grade limit<= Grade I

Imaging stenosis severity25-50% reduction in lateral/central foraminal diameter vs adjacent levels

Sitting toleranceSitting for at least 50 minutes without pain

Walking distanceCan walk at least 50 feet

BMI exclusionBMI >= 40 (not indicated)

Medical-Necessity Criteria

Interspinous Fixation (fusion) Devices - Medically Necessary

Covered when ALL of the following are met:

ALL of the following

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

NASS 2025 Recommendations — Interspinous Distraction Devices (Static, without fusion and used instead of decompression) - Indications and Contraindications

Not Medically Necessary / Unproven

Interspinous decompression and interlaminar stabilization systems (without fusion) - Not Medically Necessary

The following are considered unproven and not medically necessary due to insufficient evidence of efficacy:

ALL of the following

Interspinous decompression and interlaminar stabilization systems used without fusion for the treatment of spine pain or spinal stenosis

Provider Actions & Administrative Requirements

Documentation Required

Medical record documentation required

The patient's medical record must contain legible documentation that fully supports the medical necessity for the requested services and must be made available upon request.

Relevant medical history
Physical examination findings
Results of pertinent diagnostic tests or procedures

Prior Authorization

Benefit determination may require review

Benefit coverage is determined by federal, state, or contractual requirements and applicable laws; UnitedHealthcare may require review of medical records to assess whether the member meets the clinical criteria for coverage. Submission of records for review does not guarantee that the requested service will be covered.

Coding

Applicable CPT / Procedure Codes (referential only)CPT

22853	Insertion of interbody biomechanical device(s) with integral anterior instrumentation to intervertebral disc space in conjunction with interbody arthrodesis, each interspace
22854	Insertion of intervertebral biomechanical device(s) with integral anterior instrumentation to vertebral corpectomy(ies) defect, in conjunction with interbody arthrodesis, each contiguous defect
22859	Insertion of intervertebral biomechanical device(s) to intervertebral disc space or vertebral body defect without interbody arthrodesis, each contiguous defect
22867	Insertion of interlaminar/interspinous process stabilization/distraction device, without fusion, with open decompression, lumbar; single level
22868	Insertion of interlaminar/interspinous process stabilization/distraction device, without fusion, with open decompression, lumbar; second level
22869	Insertion of interlaminar/interspinous process stabilization/distraction device, without open decompression or fusion, lumbar; single level
22870	Insertion of interlaminar/interspinous process stabilization/distraction device, without open decompression or fusion, lumbar; second level
22899	Unlisted procedure, spine [when specified as insertion of a non-pedicle interspinous process fixation device]

Background, Evidence Summary & Definitions

Purpose/background: Interspinous fixation devices are intended to attach to spinous processes to provide stabilization and promote fusion (used as adjuncts to interbody fusion), whereas interspinous decompression/spacer/interlaminar devices are intended to distract or decompress neural elements and may be used with or without decompression.

Evidence quality and summary: The overall evidence base for decompression/spacer (ISD/ILD/IPD) devices is limited and of low-to-moderate quality with mixed outcomes; many studies are small, nonrandomized, or short-term and there are ongoing concerns about higher reoperation rates in some analyses.

Guideline update: The North American Spine Society updated coverage recommendations in 2025 — supporting interspinous fixation only when used with appropriate fusion techniques and providing specific indications/contraindications for static and dynamic devices; no literature supports use of fixation without open decortication and fusion or interbody fusion.

Systematic reviews / meta-analyses (2018–2025): Multiple reviews report low-to-moderate quality evidence and inconsistent superiority of ISD/ILD/IPD versus standard decompression; meta-analyses note short-term improvements in some patient-reported outcomes but limited long-term benefit and concerns about heterogeneity and higher reoperation rates (Poetscher 2018; Pennington 2024; Han 2024; Ge 2025; Zhu 2024).

Randomized trials and prospective studies: Several RCTs and prospective trials (e.g., Schmidt 2018; Baranidharan 2024) show clinically relevant improvements for both interspinous devices and decompression in short- to mid-term follow-up but are limited by small sample sizes, nonadherence, and short follow-up; authors call for larger, longer RCTs.

Selected references: Zhu C, Xiao G. systematic review/meta-analysis (Medicine). 2024 Jun 7;103(23):e38370 (summarized evidence on IPD vs decompression); Zucherman JF et al. prospective randomized multicenter X-STOP 1-year results (Eur Spine J. 2004) is an early RCT cited in the evidence base.

Revision History

2026-01-01Material changeLatest

Medical Records Documentation Used for Reviews: Added language clarifying that 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 clinical criteria but does not guarantee coverage; the patient's medical record must contain documentation that fully supports medical necessity (including relevant medical history, physical exam, and diagnostic test results) and must be legible and made available upon request.

2026-01-01Editorial updateLatest

Definitions updated for Arthrodesis, Interlaminar Lumbar Instrumented Fusion (ILIF), Interlaminar Stabilization Device, and Neurogenic Claudication (specific revised definition text included in policy).

Policy Summary

PayerUnitedHealthcare

PolicyInterspinous Fusion and Decompression Devices (for Pennsylvania Only)

Policy CodePolicy CS363PA.D

Change TypeDocumentation, Definitions, Supporting Evidence updates

Effective DateJan 1, 2026

Next Review DateN/A

Key ActionMaintain legible medical records that fully support medical necessity including relevant history, physical exam, and diagnostic test results and make them available upon request.

SourceLink

On This Page

ALL of the following

Associated with neurogenic claudication that is relieved by lumbar flexion
Sitting for at least 50 minutes without pain
Can walk at least 50 feet
Mild to moderate stenosis as assessed on advanced imaging (CT or MRI) defined as 25-50% reduction in lateral/central foraminal diameter compared to adjacent levels
Failure of 6 months nonoperative treatment
No more than 25° of degenerative scoliosis
No more than a Grade I degenerative spondylolisthesis
Open surgery (e.g., laminectomy) is not a medically safe treatment option because of comorbidities

Not indicated in the following scenarios

Degenerative spondylolisthesis of Grade II or higher
Degenerative scoliosis greater than 25°
Dynamic instability at the operative level
Symptoms are not relieved by flexion
Patient is medically suitable for a direct decompressive procedure (e.g., laminectomy)
Patient has primarily axial back pain that is unrelated to activity

NASS 2025 Recommendations — Interspinous Fusion Devices: Contraindications / Not Indicated Scenarios

Interspinous devices which affix to spinous processes for stabilization should not be utilized in the following scenarios:

Any of the following

Spondylolisthesis greater than Grade I
Bilateral isthmic spondylolysis
Significant dynamic instability (e.g., as detected on flexion-extension views)
Scoliosis, or signs of coronal or rotatory instability
Fusion is indicated at more than one level of the lumbar spine
Generally not indicated for procedures at L5-S1 due to mechanical limitations of fixation to small S1 spinous processes (special consideration if anatomy favorable)
Complete resection of the facet (unless accompanied by an interbody fusion)
Disc herniations: (usage only as adjunct to primary excision in absence of instability or spondylolisthesis) — not indicated otherwise
Stenosis: not indicated as adjunct in absence of instability, foraminal stenosis, spondylolisthesis
Discogenic low back pain
A fusion is otherwise not indicated as per the NASS Coverage Recommendation for Lumbar Fusion

Term	Definition
Arthrodesis	A surgical procedure to eliminate motion in a joint by providing a bony fusion for purposes including relief of pain, providing stability, correcting postural deformity from neurologic deficit, or halting advancing disease.
Interlaminar Lumbar Instrumented Fusion (ILIF)	During the ILIF procedure, an incision is made in the lower back with an opening through the ligaments to access the spinous processes; compressive bone, ligament, or disc material is removed, autologous or allograft bone may be placed between the spinous processes and on the remaining lamina, and an implant is inserted to stabilize the spine and secure the spinous processes until fusion takes place.
Interlaminar Stabilization Device	An implantable interspinous process device intended to provide symptomatic relief of claudicatory lumbar spinal stenosis; typically a U-shaped titanium device inserted horizontally between adjacent spinous processes after decompression to reduce lumbar extension while preserving flexion, axial rotation, and lateral bending.
Interspinous Fixation Devices	Devices intended for attachment to the spinous processes to achieve stabilization and promote fusion in patients with degenerative disc disease.
Interspinous Process Decompression (IPD)	A minimally invasive procedure implanting a spacer between affected spinous processes that is opened or expanded to distract the neural foramen and decompress nerves; spacers are implanted midline between adjacent lamina and spinous processes to provide dynamic stabilization and block stenosis-related lumbar extension.
Lumbar Spinal Stenosis (LSS)	Narrowing or constriction of the lumbar spinal canal that may result in painful compression of a nerve and/or blood vessels supplying the nerve, potentially causing pain, neurogenic claudication, or neurologic deficits.
Neurogenic Claudication	Symptoms of pain or weakness in the buttock, thigh, or leg due to an inflamed nerve from the spinal column that are relieved by a change in position or leaning forward and improve with rest; distinct from vascular claudication.