ModifiedUnitedHealthcarePolicy CS363NM.C

Interspinous Fusion and Decompression Devices (for New Mexico Only)

Policy governing use of interspinous fixation (fusion) and decompression/interlaminar stabilization devices for lumbar spine conditions in New Mexico members; specifies when interspinous fixation is considered medically necessary and when decompression/spacer devices are considered unproven.

Policy Summary

PayerUnitedHealthcare

PolicyInterspinous Fusion and Decompression Devices (for New Mexico Only)

Policy CodePolicy CS363NM.C

Change TypeUpdated Clinical Evidence, references, and medical record documentation language

Effective DateJan 1, 2026

Next Review DateN/A

Key ActionProvide medical record documentation demonstrating the member meets NASS qualifying criteria and that medical necessity is supported.

SourceLink

POLICY UPDATE CHANGES

Medical records documentation language clarifying that documentation may be required to assess whether the member meets clinical criteria for coverage and must support medical necessity.

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

Clinical evidence and references sections were updated to reflect current literature and assessments (ECRI, Hayes, systematic reviews, RCTs).

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 for coverage

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.

RCTsrandomized controlled trials referenced

higher riskreported higher reoperation risk

multipleprocedure codes listed

Coverage Criteria for Interspinous Devices

Interspinous Fixation (fusion) Devices — Covered when ALL criteria met

Covered when ALL of the following criteria are met:

coverage_criteria: Back pain of discogenic origin with degeneration of the disc confirmed by history and radiographic studies.

Per policy: performed according to FDA labeled indications, contraindications, warnings, and precautions.

coverage_criteria: No more than grade 1 spondylolisthesis.<= Grade I

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

Indication: Interspinous fixation devices with fusion

May be considered when ALL of the following are met:

NASS recommendations for interspinous fixation with fusion: Utilized in the context of lumbar fusion procedures for diagnoses such as stenosis, disc herniations, or synovial facet cysts; used as an adjunct when cyst excision involves removal of >50% of the facet joint or in conjunction with robust open laminar and/or facet decortication and fusion and/or robust autograft inter- and extra-spinous process decortication and fusion and/or an interbody fusion of the same motion segment.

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

contraindications_exclusions: Not used as standalone fixation without open decortication and fusion or interbody fusion; contraindications include spondylolisthesis > Grade I, bilateral isthmic spondylolysis, significant dynamic instability, scoliosis or coronal/rotatory instability, fusion indicated at >1 level; generally not indicated at L5–S1 unless anatomy is favorable.

See exclusions list for full details.

operational_note: Interspinous fixation devices should be used in accordance with NASS guidance and fused using appropriate decortication and grafting techniques; avoid standalone use without fusion.

Indication: Static interspinous distraction devices

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

NASS qualifying criteria for static interspinous devices: Clinically symptomatic degenerative lumbar stenosis with neurogenic claudication relieved by lumbar flexion; patient can sit at least 50 minutes without pain; patient can walk at least 50 feet; mild to moderate stenosis on CT or MRI (≈25–50% reduction in lateral/central foraminal diameter compared to adjacent levels); failure of ≥6 months of nonoperative treatment; degenerative scoliosis ≤ 25°; degenerative spondylolisthesis ≤ Grade I; open direct decompression (e.g., laminectomy) is not a medically safe option because of comorbidities; BMI < 40; no fixed motor deficit; no prior lumbar surgery at the intended level.as listed (e.g., 50 minutes sitting, 50 feet walking, ≤25° scoliosis, ≤ Grade I spondylolisthesis, ≥6 months nonoperative care)

Applies to static devices intended to be used instead of a direct decompressive procedure per NASS.

Interspinous decompression and interlaminar stabilization systems (without fusion) — Not medically necessary

Interspinous decompression and interlaminar stabilization systems used without fusion are considered:

not_medically_necessary: Unproven and not medically necessary for treatment of spine pain or lumbar spinal stenosis due to insufficient and low-to-moderate quality evidence of efficacy; available studies are limited in size and duration and do not establish equivalent long-term outcomes compared with standard decompressive surgery.

Multiple systematic reviews and technology assessments cited limitations including small sample sizes, risk of bias, and lack of long-term RCT evidence.

Use of interspinous spacers/devices alone (without fusion) for treatment of lumbar spinal stenosis is considered unproven and not medically necessary. The policy states that interspinous decompression and interlaminar stabilization systems used without fusion lack sufficient evidence of efficacy, and available studies are generally small, at risk of bias, and do not demonstrate equal or superior long‑term outcomes compared with standard decompression or fusion procedures.

Interspinous fixation devices should not be used in patients with: spondylolisthesis greater than Grade I, bilateral isthmic spondylolysis, or significant dynamic instability (for example, as detected on flexion‑extension radiographs). The policy and NASS recommendations also list scoliosis/coronal or rotatory instability, indication for fusion at more than one level, and general avoidance at L5‑S1 (except for selected favorable anatomy) among situations where these devices are not appropriate.

The policy rationale explains that performing decompression or stabilization with an interspinous spacer or interlaminar stabilization device without accompanying fusion is unproven because the body of evidence is limited and of low quality. Systematic reviews and health technology assessments report small, nonrandomized studies, high risk of bias, and a lack of long‑term randomized comparative trials to establish that standalone spacer/stabilization devices provide outcomes equivalent to open decompression or fusion.

The evidence base for interspinous decompression devices (without fusion) is described as generally low quality with important limitations: small sample sizes, retrospective designs, single‑center reports, and high risk of bias. Systematic reviews and technology assessments have found mixed guideline support and inconsistent results; some studies report similar short‑term outcomes but others show a higher risk of reoperation and uncertain long‑term benefit compared with standard decompression or fusion, indicating insufficient evidence to support routine standalone use.

Billing and Coding

Applicable CPT Codes (group 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 (group 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 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]

inv-11: Nonoperative treatment duration — 6 months

Nonoperative treatment duration6 months of prior nonoperative care is required (failure of conservative management)

ContextApplies to static interspinous distraction devices as a qualifying criterion

DocumentationMedical records must document duration and types of nonoperative therapies tried

inv-12: Maximum degenerative scoliosis — ≤ 25°

Maximum degenerative scoliosis≤ 25° (degenerative scoliosis must be 25 degrees or less)

Applies toStatic interspinous distraction devices used instead of direct decompression

Provider Actions, Prior Authorization and Documentation

Note

Reference benefit terms and potential third-party tools

Before using this policy, reference the member's benefit terms and any applicable federal, state, or contractual requirements, as those terms govern in the event of a conflict. UnitedHealthcare may also use third-party tools (for example, InterQual®) to assist in administering benefits.

Reference the member's benefit terms and applicable federal, state, or contractual requirements; those govern in conflicts
UnitedHealthcare may use third-party tools (e.g., InterQual®) to assist in benefit administration

Documentation Required

Medical records required

Medical records documentation may be required to assess whether the member meets the clinical criteria for coverage. The patient's medical record must contain documentation that fully supports the medical necessity for the requested services, including but not limited to relevant medical history, physical examination, and results of pertinent diagnostic tests or procedures. Documentation should be legible, maintained in the patient's medical record, and made available upon request. Documentation may be requested during review and does not guarantee coverage.

Background and Rationale

Lumbar spinal stenosis (LSS) is a degenerative narrowing of the lumbar spinal canal or foramina that can compress nerve roots and produce back and leg pain, neurogenic claudication, and sometimes neurologic deficits. Surgical options include direct decompression (laminectomy) with or without fusion; interspinous spacers are intended to provide indirect decompression by distracting the spinous processes, while interspinous fixation devices are designed to assist stabilization as an adjunct to fusion rather than as standalone fixation.

Definitions

inv-62: Interspinous Fixation Devices — definition and intended use

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

Intended useUsed as adjuncts in lumbar fusion procedures (e.g., with open decortication/fusion or interbody fusion) to provide posterior stabilization

LimitationsNot supported as standalone fixation without open decortication and fusion or interbody fusion per NASS guidance

inv-63: Interspinous Process Decompression (IPD) — definition

DefinitionA minimally invasive procedure that implants a spacer between adjacent spinous processes to distract the neural foramen and decompress nerves

Mechanism

Policy History and Revisions

01/01/2026Clinical Evidence UpdateLatest

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

01/01/2026Operational (Documentation) - Material

Added medical records documentation language clarifying that documentation may be required to assess whether the member meets clinical criteria and must fully support medical necessity.

01/01/2026Archival and References Update

Policy Summary

PayerUnitedHealthcare

PolicyInterspinous Fusion and Decompression Devices (for New Mexico Only)

Policy CodePolicy CS363NM.C

Change TypeUpdated Clinical Evidence, references, and medical record documentation language

Effective DateJan 1, 2026

Next Review DateN/A

Key ActionProvide medical record documentation demonstrating the member meets NASS qualifying criteria and that medical necessity is supported.

SourceLink

On This Page

Exclusion noteDegenerative scoliosis >25° is a contraindication to static interspinous devices

inv-13: Maximum spondylolisthesis grade — ≤ Grade I

Maximum spondylolisthesis grade≤ Grade I (no greater than Grade I degenerative spondylolisthesis)

Applies toStatic interspinous distraction devices and interspinous fixation device considerations

Exclusion noteSpondylolisthesis ≥ Grade II is not indicated for interspinous distraction devices; interspinous fixation also not for >Grade I

inv-14: Minimum sitting tolerance without pain — 50 minutes

Minimum sitting tolerance without painPatient must be able to sit at least 50 minutes without pain (symptomatic criterion)

Clinical rationalePart of NASS qualifying criteria for symptomatic degenerative lumbar stenosis

AssessmentShould be documented in medical record for prior authorization review when applicable

inv-15: Minimum walking distance — 50 feet

Minimum walking distancePatient must be able to walk at least 50 feet (symptomatic criterion)

Clinical contextUsed to define functional limitation from neurogenic claudication

DocumentationWalking distance should be recorded in clinical notes or functional assessments

inv-16: BMI exclusion threshold — >= 40

BMI exclusion threshold>= 40 (BMI greater than or equal to 40 is a contraindication)

Applies toStatic interspinous distraction devices (not indicated if BMI >= 40)

DocumentationBMI should be documented in the medical record when assessing eligibility

Medical records may be required to assess clinical criteria for coverage
Documentation must include relevant history, exam, and diagnostic test results
Records must be legible, retained in the medical record, and available upon request
Provision of documentation does not guarantee coverage

Note

Policy history and archival notes

This section contains policy history and archival notes. The policy history documents archive previous versions and note updates to Clinical Evidence and References. These policy history entries do not, by themselves, specify prior authorization, step therapy, or documentation requirements.

Section contains policy history and archival history entries
Policy history archives previous policy versions and documents updates to supporting information
Policy history entries do not specify prior authorization, step therapy, or documentation requirements

Denial Risk

No denial triggers or authorization instructions specified

No authorization or denial instructions, operational denial triggers, or specific denial criteria are stated within the policy history or archival sections of this policy. Coverage decisions must reference the member's benefit plan and applicable federal/state/contractual requirements.

No denial triggers or authorization requirements are specified in the policy history sections
No operational denial triggers or authorization instructions are present in these entries
Coverage decisions must reference federal, state, or contractual benefit plan requirements

Step Therapy

Step therapy

Step therapy is not discussed in this section.

Step therapy requirements are not included in this section

Device expands or distracts to block stenosis-related lumbar extension and provide dynamic stabilization following decompression

Clinical roleUsed to treat lumbar spinal stenosis when conservative measures have failed; often used with decompression per device labeling

inv-64: Lumbar Spinal Stenosis (LSS) — definition

DefinitionNarrowing or constriction of the lumbar spinal canal that may compress nerves, causing pain, weakness, or neurogenic claudication

Clinical presentationMay present with back and leg pain and symptoms relieved by flexion (neurogenic claudication)

RelevancePrimary diagnosis for which interspinous decompression or static devices may be considered

inv-65: Static interspinous distraction devices — definition and qualifying criteria

DefinitionStatic interspinous distraction devices are implants intended to provide indirect decompression of neural elements and used instead of a direct decompressive procedure

Qualifying criteriaInclude neurogenic claudication relieved by flexion; sitting ≥50 minutes without pain; walking ≥50 feet; mild-to-moderate stenosis on imaging; failure of 6 months nonoperative care; scoliosis ≤25°; spondylolisthesis ≤ Grade I; BMI <40; no fixed motor deficit; no prior surgery at intended level

LimitationsNot indicated for Grade II+ spondylolisthesis, scoliosis >25°, dynamic instability, symptoms not relieved by flexion, BMI >=40, or patients suitable for direct decompression

inv-66: Interspinous fixation (with fusion) — definition

DefinitionDevices that affix to the spinous processes to provide stabilization when used as adjuncts to lumbar fusion procedures

Recommended useShould be used in conjunction with robust open laminar/facet decortication and fusion, autograft decortication and fusion, and/or interbody fusion of the same motion segment

Contraindication/limitationNo literature supports use of interspinous fixation without performing open decortication and fusion of posterior elements or interbody fusion (i.e., not for standalone fixation)

Archived previous policy version CS363NM.B and updated Clinical Evidence and References sections to reflect current information.

01/01/2026Clinical Evidence Update

Multiple policy history entries noting updates to Clinical Evidence and References sections across the document.

01/01/2026Archival and Evidence Update

Policy history entries reference archival of prior version CS363NM.B and note updates to Clinical Evidence and References.

01/01/2026Summary of Changes (archival)

Recorded summary of changes associated with archiving previous policy version CS363NM.B, including updates to Clinical Evidence and References.

01/01/2026Repeated Evidence Updates

Summary of Changes repeated throughout Policy History entries indicating updated Clinical Evidence and References.

01/01/2026Archival Notice

Archived previous policy version CS363NM.B with accompanying note that Clinical Evidence and References were updated.

01/01/2026Archival and Clarification

Policy History entries record archival of CS363NM.B and clarify that Clinical Evidence and References sections were updated.

01/01/2026Repeated Archival Entries

Repeated archival entries noting CS363NM.B archived and Clinical Evidence and References updated across multiple history lines.

01/01/2026Archival and Evidence Update

Archived previous policy version CS363NM.B and updated Clinical Evidence and References sections to reflect the most current information.

01/01/2026Final Archival Note

Final repeated note in policy history indicating archived prior version CS363NM.B and updated Clinical Evidence and References.