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Currentblue cross blue shield - south dakotaPolicy 07.01.91

Surgical Treatment of Sacroiliac Joint Pain

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Defines medical necessity and investigational indications for minimally invasive and open sacroiliac joint fusion/fixation, and lists recognized SIJ fusion devices; applies to Wellmark/Blue Cross Blue Shield - South Dakota determinations.

Policy Summary

Payerblue cross blue shield - south dakota

PolicySurgical Treatment of Sacroiliac Joint Pain

Policy CodePolicy 07.01.91

Change TypeAnnual review — no material changes

Effective DateJan 1, 2010

Last ReviewJul 1, 2025

Next Review DateN/A

Key ActionDocument ≥6 months of failed conservative therapy, diagnostic confirmation with provocative tests and image-guided SIJ injection, and baseline pain/ODI before requesting authorization.

SourceLink

POLICY UPDATE CHANGES

No material clinical or coverage changes in this revision.

≥75%required pain reduction after injection (2 occasions)

≥6 monthsminimum failed conservative therapy

pain ≥5/10minimum pain severity

multiple devicesSIJ devices listed

2RCTs supporting MIS fusion

Coverage Criteria and Medical Necessity

Minimally Invasive SIJ Fusion (transiliac triangular implant)

Covered when ALL of the following are met:

Minimally Invasive SIJ Fusion Criteria: Pain is at least 5/10 that impacts quality of life or limits activities of daily living.pain >= 5/10

From policy: minimum pain severity required for consideration.

Minimally Invasive SIJ Fusion Criteria: Absence of generalized pain behavior or generalized pain disorders (e.g., somatoform disorder, fibromyalgia).

Exclude generalized pain syndromes that would confound benefit.

Minimally Invasive SIJ Fusion Criteria: Failed a minimum of 6 months of intensive nonoperative treatment including medication optimization, activity modification, bracing, and targeted active therapeutic exercise (including a home exercise program).

Policy Summary

Payerblue cross blue shield - south dakota

PolicySurgical Treatment of Sacroiliac Joint Pain

Policy CodePolicy 07.01.91

Change TypeAnnual review — no material changes

Effective DateJan 1, 2010

Last ReviewJul 1, 2025

Next Review DateN/A

Key ActionDocument ≥6 months of failed conservative therapy, diagnostic confirmation with provocative tests and image-guided SIJ injection, and baseline pain/ODI before requesting authorization.

SourceLink

On This Page

Open SIJ Fusion — Medically Necessary Indications

Open SIJ fusion is considered medically necessary for any of the following indications:

Open SIJ Fusion Indications: Adjunct to sacrectomy or partial sacrectomy for tumors involving the sacrum (reconstruction as part of tumor resection).

Open SIJF used for sacral tumor reconstruction.

Open SIJ Fusion Indications: Adjunct to medical treatment of sacroiliac joint infection/sepsis when surgical stabilization is required in addition to antibiotics/drainage.

Open SIJF for infection-related indications.

Open SIJ Fusion Indications: Severe traumatic pelvic ring injuries (fracture or dislocation) requiring pelvic fixation and reconstruction.

Open SIJF for pelvic ring disruption.

Open SIJ Fusion Indications: During multisegment spinal constructs extending to the ilium (e.g., scoliosis or kyphosis correction) where pelvic fixation is indicated.

Open SIJF performed in conjunction with complex spinal deformity reconstruction.

Coverage criteria for SIJ fusion

Covered when ALL of the following are met:

Surgeon qualifications: Procedure performed by a surgeon with specific training and expertise in minimally invasive SIJ fusion who regularly uses image guidance for implant placement.

Technical demands and training requirement per device/technique statements.

Conservative nonsurgical therapy: Documented trial of prescription-strength analgesics for several weeks (including NSAIDs and adjuncts as appropriate), participation in at least 6 weeks of physical therapy (including active exercise) or documentation of intolerance, evaluation and management of cognitive/behavioral/addiction issues, and documentation of patient compliance.>= 6 weeks PT (unless intolerance documented)

Conservative therapy elements explicitly required.

Medical necessity criteria

Covered when ALL of the following are met:

Patient selection: Adult patient with sacroiliac joint (SIJ) pain as the primary target condition.

Population consistent with clinical trials and intended use.

Diagnostic confirmation: SIJ identified as the pain generator by history localizing pain near the posterior superior iliac spine or sacral sulcus, at least 3 positive findings on 5 established provocative physical tests, and at least 50% acute pain reduction after a fluoroscopically guided intra-articular SIJ local anesthetic injection.>= 50%

Diagnostic cluster and injection threshold used in key trials.

Prior conservative therapy: Documentation of attempted conservative management (e.g., physical therapy, intra-articular steroid injections, radiofrequency ablation) unless clinically contraindicated.

Conservative therapy was the comparator in trials and is expected prior to surgery.

Appropriate device selection: Use of an SIJ fixation/fusion system cleared for the intended approach (triangular transiliac implants or other cleared systems) with implant selection consistent with available peer-reviewed evidence and surgeon expertise.

Device selection aligned with cleared systems and evidence base.

Coverage with criteria (general)

Evidence-supported coverage is contingent on clinical context where SIJ fusion/fixation is considered for individuals with documented SIJ pain and prior conservative therapy.

General coverage conditions: 1) Documented diagnosis of SIJ pain with history and exam; 2) Objective baseline measures of pain and disability (e.g., VAS/NRS, ODI); 3) Trial and failure of appropriate conservative therapy documented; 4) Patient selection consistent with populations enrolled in clinical trials (persistent symptoms despite nonsurgical management).

Derived from comparator and outcomes expectations in the evidence review.

Coverage considerations for open SIJ fusion and non-triangular implant SIJ fixation

Coverage consideration based on available evidence

Coverage considerations: 1) Document SIJ pain related to the specified indications and ensure objective baseline and follow-up outcome measures are available; 2) Confirm failure of conservative therapy (medication, physical therapy, injections) prior to surgery unless contraindicated; 3) Perform diagnostic confirmation (e.g., diagnostic SIJ injection) where appropriate; 4) Acknowledge that much evidence for open SIJF and non-triangular implants is from nonrandomized cohorts and single-arm studies with limited follow-up and that comparative evidence is limited.

Summarizes evidence limitations and implications for coverage decisions.

Minimally invasive SIJ fusion — society-recommended eligibility

Covered when ALL of the following are met (per society guidance statements summarized):

MIS SIJ fusion eligibility: 1) Chronic SIJ pain persisting at least 6 months; 2) Failure of conservative measures (including physical therapy and, where used, injections); 3) Pain interfering with activities with documented VAS/NRS >=5 and ODI >=30; 4) Predominant pain pattern consistent with SIJ pathology with positive physical exam maneuvers (>=3) and positive Fortin finger test; 5) Diagnostic imaging (CT or MRI) excludes destructive lesions; 6) Diagnostic image-guided intra-articular SIJ injection with >=50% acute pain relief; 7) Use of implants and approach supported by peer-reviewed prospective clinical evidence and consistent with device labeling.see individual items

Reflects ASPN, ISASS and other society recommendations summarized in the policy.

Open SIJ fusion — indications and evidence stance

Open SIJ fusion may be considered in specific contexts, but evidence is limited:

Open SIJ fusion contexts: Open SIJ fusion has been used as adjunctive therapy for sacroiliac joint infection (with antibiotics/drainage), reconstruction after sacral tumor resection, severe pelvic ring trauma requiring fixation, and as part of complex spinal-pelvic reconstructions; available evidence is primarily small case series and retrospective reports with limited comparative data and follow-up.

Open SIJF accepted in structural/oncologic/trauma contexts despite limited high-quality evidence.

Indications (NASS/ISASS-aligned)

Covered when ALL of the following are met:

Primary coverage criteria for MIS SIJ fusion: 1) Significant SIJ pain impacting quality of life or activities of daily living; 2) SIJ pain reproduced by >=3 provocative physical examination maneuvers; 3) Confirmation of the SIJ as the pain generator with >=50% acute decrease in pain on a fluoroscopically-guided diagnostic intra-articular SIJ block; 4) Failure of >=6 months of non-surgical management including NSAIDs and physical therapy; 5) Alternative or additional diagnoses considered and excluded as primary causes of the patient's disability.see individual nodes

Aligned with NASS/ISASS statements and trial inclusion criteria; recognizes that 50-75% block responses can predict benefit.

Initial surgical selection criteria

Covered when ALL of the following are met:

Initial surgical selection criteria: Significant SIJ pain that impacts quality of life or ADLs; SIJ pain confirmed by at least 3 positive provocative maneuvers reproducing typical pain; confirmation of SIJ as pain generator with image-guided intra-articular SIJ block demonstrating acute pain reduction (commonly >=50% though some guidelines prefer >=75% or repeat blocks); failure to respond to at least 6 months of intensive nonoperative care (medication optimization, activity modification, bracing, targeted therapeutic exercise); and exclusion of alternative diagnoses by imaging and clinical evaluation.

Combines society statements and evidence indicating both 50% and 75% thresholds are used; trials support benefit among those with 50-75% relief.

Coverage criteria for MIS SIJ fusion

Coverage is supported when ALL of the following are documented and met:

Diagnostic confirmation: Clinical evaluation and diagnostic testing document the SI joint as the primary pain generator (e.g., image-guided intra-articular SI joint injection or prognostic lateral branch blocks where appropriate).

Document diagnostic injection response and provocation testing as applicable.

Conservative management attempted: Appropriate conservative therapy (physical therapy, injections, multimodal care including psychosocial interventions where applicable) has been attempted and documented unless contraindicated.

Psychosocial assessment and opioid tapering where indicated are recommended prior to invasive procedures.

Patient selection for fusion: Patient selection aligns with evidence showing benefit (failed conservative therapy, diagnostic confirmation if used, absence of competing pain generators), and use of implants/approach consistent with peer-reviewed prospective evidence when available.

Aligns selection with populations showing benefit in trials and cohorts.

Codes, Devices, and Regulatory Information

Recognized SIJ Fusion Devicesmixed

iFuse	iFuse ® titanium triangular rod (SI Bone, Inc.)
iFuse 3D	iFuse ® 3D printed porous rod (SI Bone, Inc.)
iFuse TORQ / iFuse TORQ TNT	3D printed cannulated screw implant systems (SI-Bone Inc.)
iFuse Bedrock Granite	3D printed screw with porous graft windows (SI Bone, Inc.)
FIREBIRD SI Fusion System	Cannulated screw (Orthofix)
SambaScrew	Cannulated screw (Orthofix)
Silex Sacroiliac Joint Fusion	Cannulated screw (X-Spine Systems)
SI-LOK	Sacroiliac joint fixation system, cannulated screw (Globus Medical)
SImmetry	Sacroiliac joint fusion system, cannulated screw (RTI)
SIimpact	Sacroiliac joint fixation system, cannulated screw (Life Spine)

1–10 of 27

1/3

Codes table referencedmixed

No codes listed

Regulatory clearances / device identifiersmixed

K240720	TiLink-P SI Joint Fusion System - regulatory identifier
K242141	TiLink-P SI Joint Fusion System - regulatory identifier
K232275	Invictus Spinal Fixation System clearance
K231744	VyLink Spinal Screw System clearance
K232259	Patriot-SI Posterior Implant System clearance
K232877	Huvex Interspinous Fixation System clearance
K241813	SI-DESIS X Sacroiliac Joint Fusion System clearance

Procedure CPT CodesCPTCovered

27278	Arthrodesis, sacroiliac joint, percutaneous, or minimally invasive, with image guidance, includes obtaining bone graft when performed, unilateral placement of intra-articular device(s), without cortical piercing
27279	Arthrodesis, sacroiliac joint, percutaneous, or minimally invasive, with image guidance, includes obtaining bone graft when performed, unilateral placement of transarticular device(s) and/or intra-articular device(s) piercing the lateral or medial cortices of the ilium and the lateral cortex of the sacrum
27280	Arthrodesis, sacroiliac joint, open, includes obtaining bone graft, including instrumentation, when performed
27299	Unlisted procedure, pelvis, or hip joint

HCPCS Implant CodesHCPCSCovered

C1737

Joint fusion and fixation device(s), sacroiliac and pelvis, including all system components (implantable)

Covered CPT Codes (general mention)mixed

Category I CPT® code effective Jan 1, 2015

CPT code assigned for minimally invasive sacroiliac joint fusion (document references Category I CPT adoption).

Referenced studies and devices (no explicit billing codes listed in this section)mixed

No codes listed

inv-40: Diagnostic SIJ injection response — ≥75% pain reduction for the expected duration of the anesthetic on 2 separate occasions

Diagnostic SIJ injection response≥75% pain reduction for the expected duration of the anesthetic on 2 separate occasions

ContextUsed as confirmatory diagnostic criterion for minimally invasive transiliac triangular implant (iFuse) candidacy

Documentation requiredTwo image-guided, contrast-enhanced intra‑articular SIJ injections with recorded percent pain reduction

inv-41: Conservative therapy duration — Minimum 6 months of intensive nonoperative treatment

Minimum conservative therapy durationMinimum 6 months of intensive nonoperative treatment (medication optimization, activity modification, bracing, targeted therapeutic exercise including home program)

Alternative society guidanceSome societies accept failure of NSAIDs plus 4–6 weeks of PT for consideration in certain contexts

DocumentationRecord duration, types of therapies attempted, and reasons for intolerance if applicable

inv-42: Diagnostic SIJ block relief threshold — >= 50% pain reduction

Diagnostic SIJ block relief threshold>= 50% pain reduction (acute) accepted as diagnostic in many trials and society statements

Trial inclusionINSITE and iMIA trials used ≥50% reduction after fluoroscopically guided intra‑articular SIJ injection as inclusion criterion

Procedure specificsFluoroscopically guided intra‑articular injection using small volume local anesthetic; record percent pain relief

inv-43: Conservative therapy duration — >= 6 months (per some societies) or 4-6 weeks of PT plus NSAIDs per other guidance

Conservative therapy duration (society guidance)>= 6 months per some societies; other guidance allows 4–6 weeks of PT plus NSAIDs as an initial required trial

ComponentsPhysical therapy, NSAIDs, consideration of injections or RFA; PT course typically 4–6 weeks when specified by some societies

ExpectationDocumented failure of conservative measures interfering with ADLs required before surgical consideration

inv-44: Diagnostic injection response — >= 50% pain relief

Diagnostic injection response threshold>= 50% pain relief (acute) from image‑guided intra‑articular SIJ injection commonly used to confirm SIJ as pain generator

Society recommendationsASPN and ISASS recommend ≥50% acute decrease on diagnostic SIJ block; some guidelines set higher thresholds in specific protocols

Diagnostic roleBlocks are diagnostic, not therapeutic; document percent relief and duration of anesthetic effect

inv-45: Pain/function thresholds — VAS/NRS >= 5 and ODI >= 30

Pain severity thresholdVAS/NRS ≥ 5 (of 0–10)

Disability thresholdOswestry Disability Index (ODI) ≥ 30

Use in eligibilityRequired by some society statements to document clinically significant pain and functional impairment prior to considering fusion

inv-46: Diagnostic SIJ block pain relief threshold — >= 50%

Diagnostic SIJ block pain relief threshold>= 50% acute pain relief on fluoroscopically guided intra‑articular SIJ block (commonly accepted)

Trial evidence noteProspective trials used ≥50% as inclusion and outcomes similar for 50–75% vs 75–100% responders

DocumentationRecord injection technique (contrast‑enhanced when performed), volume, and percent pain reduction

inv-47: Provocative maneuvers positive count — >= 3 positive maneuvers

Provocative maneuvers count>= 3 positive maneuvers (of tests such as Patrick/FABER, thigh thrust, compression, distraction, Gaenslen, posterior provocation)

Role in diagnosisThree or more positive tests are highly suggestive of SIJ pain and correlate with response to diagnostic block

DocumentationList which maneuvers were positive and that they reproduced the patient's typical pain

inv-48: Diagnostic block pain relief threshold — commonly ≥50% (some guidelines require ≥75% or two occasions of ≥75%)

Common diagnostic block threshold≥50% acute pain relief is commonly used as diagnostic threshold

Higher-threshold optionSome guidelines or stricter criteria require ≥75% relief or two occasions of ≥75% relief for diagnostic confirmation

Practical implicationTrials show patients with 50–75% acute response may still benefit from fusion, so policies commonly accept ≥50%

inv-49: Clinically meaningful ODI improvement — >15 point improvement (example from RCT)

Clinically meaningful ODI improvement>15‑point improvement in ODI (example: 75% of fusion patients achieved >15‑point ODI improvement at 6 months in RCT data)

Evidence sourceObserved in randomized and prospective studies comparing MIS SIJ fusion to nonoperative care

Use in outcomes assessmentDocument baseline and follow-up ODI to demonstrate clinically meaningful improvement

Prior Authorization, Documentation, and Billing Guidance

Prior Authorization

Prior Authorization: Surgeon Qualifications

Prior authorization: Surgeon qualifications and conservative therapy documentation — Although the policy header indicates prior approval is not applicable, when prior authorization is requested the provider must document the surgeon's specific training and expertise in minimally invasive SIJ fusion and regular use of image guidance for implant placement. Documentation should also verify completion of required conservative nonsurgical therapy prior to surgery.

Surgeon training/expertise and routine use of image guidance must be documented.
If prior authorization is sought, include evidence of surgeon experience with the proposed MIS SIJ technique.

Documentation Required

Prior Authorization: Conservative Management and Baseline Measures

Prior authorization: document conservative management and baseline outcomes — For patients considered for MIS SIJ fusion, document a minimum of 6 months of intensive nonoperative management (including medication optimization, activity modification, bracing, and active therapeutic exercise) or a clear reason why components could not be tolerated. Include baseline and objective outcome measures (pain score VAS/NRS, ODI, QOL) and documentation of therapeutic trials (e.g., at least one therapeutic SIJ corticosteroid injection).

Minimum 6 months of intensive nonoperative care required (or documented intolerance/exemption).
Baseline pain score (VAS/NRS) and ODI; document follow-up/outcome measures.
Record trials of prescription-strength analgesics and at least 6 weeks of PT or reason for not tolerating PT.
Documentatation of at least one therapeutic SIJ injection (corticosteroid) when performed.

Billing Rule

Prior Authorization & Billing: Confirm Authorization and Codes

Confirm prior authorization and use listed codes — Providers should confirm current prior authorization requirements with Blue Cross Blue Shield - South Dakota before scheduling procedures. Use the listed CPT and HCPCS codes when billing: CPT 27278, 27279, 27280, 27299 and HCPCS implant code C1737 where applicable.

Verify payer-specific prior authorization requirements prior to procedure.
Report procedures with CPT codes 27278, 27279, 27280, 27299 as appropriate.
Report implant with HCPCS C1737 when applicable.

Prior Authorization

Prior Authorization Recommended for MIS SIJ Fusion

Prior authorization recommended for MIS SIJ fusion — Given device considerations and evidence-based selection criteria, prior authorization is recommended when available to ensure documentation meets the policy's clinical prerequisites (diagnostic confirmation, conservative therapy, and objective baseline measures).

Recommend seeking prior authorization for minimally invasive SIJ fusion when the insurer offers a review pathway.
Authorization requests should reference device-specific evidence and the clinical criteria met.

Documentation Required

Diagnostic Confirmation and Prior Conservative Therapy

Diagnostic blocks and prior conservative therapy — Authorization and medical necessity determinations should be supported by diagnostic confirmation of the SIJ as the pain generator: at least 3 positive provocative maneuvers and image-guided diagnostic SIJ injection(s) demonstrating ≥50% (or per some guidance ≥75%) pain relief for the expected duration of anesthetic on repeat occasion(s). Document prior conservative therapies including NSAIDs, PT, injections, and any RFA trials or reasons they were not used.

Document at least 3 of 5 positive provocative SIJ tests.
Document results of image-guided diagnostic SIJ injection(s) with percentage relief and duration; repeat confirmation preferred.
Document prior trials of NSAIDs, physical therapy, injections, and any RFA.

Denial Risk

Denial Risk: Incomplete Conservative Therapy or Diagnostic Workup

Lack of documentation of completion of required conservative therapy or diagnostic confirmation may lead to denial — Requests that do not demonstrate failure of at least 6 months of nonoperative treatment, absence of documented completion or intolerance of required conservative measures, or lack of diagnostic SIJ injection results are at risk for denial.

Failure to document ≥6 months of nonoperative care (or valid exception) is a denial risk.
Absence of diagnostic injection results or insufficient provocative testing increases likelihood of denial.

Step Therapy

Conservative Therapy as Comparator

Conservative therapy as the comparator — Conservative management (medical management, physical therapy, injections, RFA) is the standard comparator for SIJ pain. Authorization reviewers will expect documentation that conservative options were considered and tried prior to surgical fusion.

List conservative treatments attempted and responses.
If conservative therapy was not possible, document reasons and attempts at alternative nonoperative care.

Note

Evidence Uncertainty and Impact on Authorization

Uncertainty exists due to paucity of rigorous comparative evidence for some procedures and devices — Authorization decisions may consider limitations in comparative evidence, heterogeneity across implant designs and approaches, and the quality of supporting studies.

When using emerging devices or approaches without robust RCT evidence, include peer-reviewed prospective evidence supporting the chosen implant/approach.
Document rationale for device selection if comparative evidence is limited.

Billing Rule

Billing/Coding Risk

Coding-based denial risk — Use of incorrect CPT/HCPCS/ICD-10 or failure to report the appropriate implant codes may result in claim denials or delays. Ensure coding matches the documented procedure (percutaneous/minimally invasive vs open) and includes implant HCPCS where applicable.

Report minimally invasive arthrodesis with CPT 27278 or 27279 as applicable; open SIJ fusion with CPT 27280.
Use unlisted code 27299 only when no appropriate CPT describes the service.
Report implant device C1737 when billing for joint fusion and fixation device(s).

Documentation Required

Patient Selection and Diagnostic Evaluation

Patient selection and diagnostic evaluation — Good candidate selection requires documentation that alternative or additional pain generators were considered and ruled out (imaging to exclude tumor/infection, lumbar pathology, hip pathology), absence of generalized pain disorders, and concordant history, exam, and imaging. Poor patient selection or incomplete diagnostic evaluation can lead to authorization denial or poor outcomes.

Include lumbar spine and pelvic imaging to exclude alternative causes.
Document Fortin's point tenderness and concordant history consistent with SIJ pain.
Document assessment for generalized pain disorders (e.g., fibromyalgia) and exclusion when present.

Note

Evidence Considerations: RCT and Prospective Data

Lack of high-quality randomized controlled trial evidence for some interventions — Reviewers may weigh the strength of evidence when evaluating requests, particularly for newer implant types or approaches lacking RCT data; include available prospective multicenter studies and long-term follow-up where possible.

Provide peer-reviewed prospective, multicenter evidence when available to support use of a specific device/approach.
Acknowledge limitations in evidence and provide rationale for expected benefit.

Denial Risk

Reported Poor Outcomes and Risk Mitigation

Poor outcomes reported after some SIJ fusion procedures — Authorization reviewers may consider reported cases of poor outcomes or higher revision rates in certain series; include patient selection rationale and risk mitigation (surgeon experience, device choice) in the request.

If device-specific adverse event or revision data exist, include discussion of how risks will be mitigated.
Document surgeon experience and institutional outcomes where available.

Documentation Required

Required Clinical Documentation for MIS SIJ Fusion

Required clinical documentation for minimally invasive SIJ fusion — Include: duration of pain (≥6 months), baseline pain severity (VAS/NRS ≥5), ODI (≥30 where applicable), absence of generalized pain disorder, documentation of ≥3 positive provocative maneuvers, imaging excluding other causes, results of diagnostic SIJ block(s) with documented percent relief, and record of prior nonoperative treatments and responses.

Document pain duration, baseline VAS/NRS and ODI.
Record at least 3 positive provocative SIJ tests and Fortin's point tenderness.
Include SIJ imaging (X-ray/CT/MRI) and lumbar/pelvic imaging to rule out other pathology.
Document diagnostic SIJ injection results (percent relief and duration) and prior conservative treatments tried.

Documentation Required

Required Documentation for Open SIJ Fusion

Required documentation for open SIJ fusion — When open fusion is proposed, document one of the listed indications: tumor adjunct to sacrectomy, infection/sepsis requiring fusion, severe traumatic pelvic ring disruption, or inclusion as part of multisegment spinal constructs extending to the ilium. Open fusion for degenerative SIJ pain or routine mechanical low back pain is investigational and not supported.

Provide operative indication aligning with policy-listed acceptable indications for open SIJ fusion.
If open fusion is requested for indications outside the policy list, supply supporting evidence and justification.

Documentation Required

Surgeon Training and Expertise Documentation

Documentation that the surgeon has specific training and expertise — Include credentialing, volume/experience with the proposed device/approach, and evidence of routine use of image guidance to support procedural competence.

Attach surgeon CV or procedure log demonstrating experience with MIS SIJ fusion.
Document routine use of fluoroscopy/CT-guidance and institutional support for the procedure.

Documentation Required

Required Clinical Measures and Prior Therapy Documentation

Required clinical measures and prior therapy documentation — Requests should include objective baseline and prior therapy documentation: pain scores, ODI, QOL measures, list and dates of conservative treatments and interventional procedures, response to each, and any reasons for not tolerating specific therapies.

Provide chronological record of conservative treatments, dates, and responses.
Include baseline and follow-up outcome measures (VAS/NRS, ODI, QOL instruments).

Documentation Required

Consolidated Documentation Expectations

Documentation should include prior conservative treatments attempted and diagnostic confirmations — Authorization packets should consolidate evidence of conservative care failures, objective outcome measures showing ongoing disability, and confirmatory diagnostic blocks demonstrating the SIJ as the pain generator.

Consolidate conservative therapy attempts and outcomes in the request.
Include copies of diagnostic block procedure notes with documented percent pain relief.

Documentation Required

Required Clinical Documentation (General)

Required clinical documentation (general) — Ensure history and physical are consistent with SIJ pain, include imaging to exclude other causes, document at least 3 positive provocative maneuvers, and provide evidence of failed nonoperative treatment for ≥6 months.

Attach H&P demonstrating localization of pain to SIJ and exclusion of competing diagnoses.
Include imaging reports (SIJ, pelvis, lumbar spine) ruling out tumor/infection/other causes.

Billing Rule

Required Coding Documentation

Required coding documentation — Providers must report the procedure using the listed CPT codes (27278, 27279, 27280, 27299) and HCPCS implant code C1737 when applicable; incorrect coding may lead to claim denial.

Use CPT 27278/27279 for percutaneous/minimally invasive procedures, CPT 27280 for open fusion.
Use HCPCS C1737 for joint fusion and fixation device(s) when billing for implants.
Use 27299 only when no other CPT accurately describes the service.

Background and Evidence Overview

BACKGROUND: The sacroiliac joint (SIJ) is recognized as a potential source of low back pain. SIJ fusion or fixation—performed via minimally invasive lateral/transiliac triangular implants or via other minimally invasive or open approaches—has been proposed to treat degenerative sacroiliitis, instability, or selected post-traumatic, infectious, or oncologic indications when patients have not improved with conservative care. Evidence quality and outcomes vary by device and surgical approach.

Evidence context: A blinded sham-controlled randomized trial found no significant difference in pain outcomes through 6 months, and other randomized or nonrandomized trials show improvements in open-label comparisons; therefore, procedures that lack evidence of benefit beyond 6 months in sham-controlled settings or that do not use rigorous patient selection criteria may be excluded from coverage.

Definitions and Key Terms

inv-98: SIJ fusion/fixation — Sacroiliac joint (SIJ) is defined as potential source of low back pain

SIJ as pain sourceThe sacroiliac joint (SIJ) is recognized as a potential source of low back pain; diagnostic evaluation includes history, provocative testing, and diagnostic injections

Therapeutic contextSIJ fusion/fixation (minimally invasive or open) is considered for patients unresponsive to conservative therapy

Anatomic noteSIJ includes intra‑articular and extra‑articular components; diagnosis may require targeted approaches depending on suspected pain generator

inv-99: Diagnostic intra-articular SIJ injection response (≥75% reduction for anesthetic duration on 2 occasions)

Diagnostic intra‑articular SIJ injection response (stringent)≥75% reduction in pain for the expected duration of the anesthetic on 2 separate occasions (stringent criterion for MIS iFuse candidacy)

DocumentationTwo image‑guided, contrast‑enhanced intra‑articular injections with recorded percent relief are required when applying this stricter threshold

Policy roleSpecified as part of minimally invasive transiliac triangular implant (iFuse) coverage criteria in some statements

inv-100: SIJ fixation vs fusion — distinction between fixation without radiographic bridging bone vs true fusion

Fixation vs fusion distinctionSome procedures termed 'SIJ fusion' may produce fixation without radiographic bridging bone; true fusion implies arthrodesis with bone bridging

ImplicationRadiographic evidence of bridging bone may be used to differentiate fixation from fusion in follow-up imaging

Device designSome implants include graft windows or accept bone graft to promote bone ingrowth and fusion

inv-101: FDA clearance pathway — Many percutaneous/minimally invasive SIJ devices cleared via 510(k) (product code OUR)

FDA clearance pathwayMany percutaneous/minimally invasive SIJ devices have been cleared via the FDA 510(k) pathway (product code OUR)

Regulatory identifiersMultiple device clearances and K‑numbers are listed in policy device tables

Implication for useDevices should be used according to FDA labeling and available peer‑reviewed evidence

inv-102: Diagnostic SIJ block — fluoroscopically guided intraarticular injection producing ≥50% pain reduction

Diagnostic SIJ block definitionFluoroscopically guided intra‑articular injection of local anesthetic producing ≥50% acute pain reduction used to confirm SIJ as pain generator

Technique noteUse small volumes appropriate to joint capacity and document percent relief and duration

Role in trialsUsed as inclusion criterion in randomized trials such as INSITE and iMIA

inv-103: Transiliac triangular implant (iFuse) — description

Transiliac triangular implant (iFuse) descriptionTriangular titanium implant placed across the sacroiliac joint via a transiliac lateral approach intended to achieve fixation and fusion (iFuse Implant System)

Clinical evidenceiFuse has been evaluated in randomized and prospective cohort studies showing improvements in pain and function

Device featureDesign promotes rotational stability and may accept bone graft to facilitate fusion

inv-104: Posterior approach implants / distraction arthrodesis — description

Posterior approach implants / distraction arthrodesisImplants inserted into the ligamentous recess between sacrum and ilium that increase joint space and tension ligaments; may be allograft or used with graft to achieve arthrodesis

MechanismMay reposition joint surfaces and rely on ligamentotaxis rather than transfixing lateral implants

Evidence statusProspective cohort data exist but comparative evidence limited; some societies consider these emerging techniques of uncertain necessity

inv-105: Open sacroiliac joint fusion (SIJF) — definition

Open sacroiliac joint fusion (SIJF)Surgical procedure that fuses the iliac bone to the sacrum to stabilize the SIJ, often used as adjunct in infection, tumor resection, or severe traumatic reconstruction

EvidenceSupport primarily from small case series; comparative effectiveness and long‑term safety are uncertain

IndicationsAdjunct to sacrectomy, treatment of infection/sepsis, pelvic ring disruption, or in multisegment constructs extending to the ilium

inv-106: Non-triangular implant SIJ fixation/fusion — definition

Non‑triangular implant SIJ fixation/fusionSIJ fixation/fusion using implants other than the transiliac triangular implant (e.g., cylindrical threaded screws, posterior allograft devices)

EvidenceProspective cohort studies exist; comparative data versus triangular implants limited

Clinical implicationOutcomes and fusion rates may vary by implant design; controlled studies needed

inv-107: Open SIJ fusion — definition and contexts

Open SIJ fusion definition & contextsOpen surgical fusion of the sacroiliac joint performed via open approaches; may be used with tumor resection, infection management, or pelvic trauma reconstruction

Evidence stanceEvidence consists mainly of case series and retrospective reports; prospective comparative trials lacking

Use cautionConsidered medically necessary only for specific indications; otherwise investigational

inv-108: Minimally invasive SIJ fusion (MIS SIJF) — definition

Minimally invasive SIJ fusion (MIS SIJF) definitionPercutaneous or limited‑access surgical techniques for SIJ fusion using lateral transfixing devices or other implants intended to arthrodese the joint

Society alignmentSupported by several professional society guidance statements when specific diagnostic and conservative treatment criteria are met

Typical approachLateral transiliac transfixing implants (e.g., triangular rods) are commonly used in MIS SIJF trials

inv-109: Minimally invasive sacroiliac joint fusion — brief description

Minimally invasive sacroiliac joint fusion — briefProcedure performed percutaneously or via limited access to stabilize and promote fusion of the SIJ using implants; clinical trials show improvements versus nonoperative care in selected patients

Outcome measuresPain (VAS/NRS), ODI, and device‑related adverse events typically reported

Patient selectionRequires diagnostic confirmation and failure of conservative therapy per society/policy criteria

inv-110: Provocative maneuvers — list of maneuvers; 3 or more positive considered supportive

Provocative maneuvers listPatrick/FABER, iliac distraction, iliac compression, thigh thrust, Gaenslen (posterior provocation) — 3 or more positive tests considered supportive

Diagnostic valueCluster of 3+ positive maneuvers correlates with diagnostic block response and supports SIJ as pain generator

DocumentationRecord which maneuvers reproduced the patient's typical pain

inv-111: Diagnostic SIJ block — fluoroscopy-guided intra-articular injection with acute reduction in typical pain

Diagnostic SIJ block (definition)Fluoroscopy‑guided intra‑articular injection of local anesthetic with acute reduction in typical pain used to confirm SIJ as primary pain generator

ThresholdsMany trials/society statements accept ≥50% acute pain relief as diagnostic; some policies/organizations use stricter thresholds

TechniqueContrast‑enhanced injection recommended to confirm intra‑articular placement; document percent relief

inv-112: Diagnostic SIJ block — defined percentage reduction in pain used diagnostically

Diagnostic SIJ block percentage definitionA defined percentage reduction in pain (commonly ≥50%; some guidelines require ≥75% or repeat positive blocks) during the anesthetic duration is used diagnostically

Clinical interpretationTrials show similar outcomes for patients with 50–75% vs 75–100% acute block responses

RecommendationDocument percentage relief and whether single or repeat blocks were performed

inv-113: iFuse / MIS SIJ fusion — device/technique definition

iFuse / MIS SIJ fusion — device/techniqueTriangular titanium transiliac implant system (iFuse) used percutaneously to stabilize the SIJ and promote arthrodesis

Evidence baseEvaluated in randomized trials (INSITE, iMIA) and prospective cohorts demonstrating pain and function improvements in selected patients

Device characteristicsTriangular geometry for rotational stability; some models accept bone graft

inv-114: Sacroiliac joint (SIJ) components — anatomy summary

SIJ componentsIncludes intra‑articular elements and extra‑articular dorsal and ventral ligamentous structures; extra‑articular portions may not be amenable to intra‑articular blockade

Diagnostic implicationChoice of diagnostic block (intra‑articular vs lateral branch/prognostic blocks) depends on suspected pain generator within SIJ complex

Clinical noteConsider lateral branch blocks when extra‑articular ligamentous pain suspected

inv-115: Prognostic lateral branch blocks — diagnostic nerve blocks targeting lateral sacral branches

Prognostic lateral branch blocksDiagnostic nerve blocks targeting lateral sacral branches used to select patients when extra‑articular SIJ ligamentous pain is suspected

RoleMay help select candidates for procedures targeting extra‑articular pain (e.g., RFA) rather than intra‑articular fusion

Technique noteMulti‑site, multi‑depth lateral branch blocks have been evaluated to anesthetize the SIJ complex

inv-116: Diagnostic sacroiliac joint block — single or dual block strategies described

Diagnostic sacroiliac joint block strategiesSingle or dual (repeat) image‑guided intra‑articular blocks described; dual blocks may reduce false‑positive/negative risk

RationaleSome guidance and trials describe using repeat blocks or contrast‑enhanced technique to improve diagnostic accuracy

DocumentationState whether single or repeat blocks performed and record percent relief for each

Policy Revision History

2025-07Annual review / Policy renewedLatest

Annual review and policy renewal recorded in July 2025.

2024-07Annual review / Policy renewed

Annual review and policy renewal recorded in July 2024.

2023-07Annual review / Policy revised

Annual review and policy revision in July 2023, with content moved from a retired policy ('Miscellaneous Surgical Treatments of Back Pain').

2022-01Interim review / Policy revised

Interim review and policy revision recorded in January 2022.

2021-07Annual review / Policy revised

Annual review and policy revision recorded in July 2021.

2020-07Annual review / Policy revised

Annual review and policy revision recorded in July 2020.

2019-10Interim review / Policy revised

Interim review and policy revision recorded in October 2019.

2018-07Annual review / Policy revised

Annual review and policy revision recorded in July 2018.

2017-07Annual review / Policy revised

Annual review and policy revision recorded in July 2017.

2016-07Annual review / Policy revised

Annual review and policy revision recorded in July 2016.

2015-07Annual review / Policy revised

Annual review and policy revision recorded in July 2015.

2015-10Interim review / Policy revised

Interim review and policy revision recorded in October 2015.

2015-08Annual review / Policy revised

Annual review and policy revision recorded in August 2015.

2014-09Annual review / Policy revised

Annual review and policy revision recorded in September 2014.

2013-10Annual review / Policy revised

Annual review and policy revision recorded in October 2013.

2012-11Annual review / Policy renewed

Annual review and policy renewal recorded in November 2012.

2011-11Annual review / Policy renewed

Annual review and policy renewal recorded in November 2011.

2010-10Annual review / Policy renewed

Annual review and policy renewal recorded in October 2010.