CurrentUnitedHealthcarePolicy CS200KY.14

Sacroiliac Joint Interventions (for Kentucky Only)

UnitedHealthcare Kentucky-specific medical policy addressing coverage and medical necessity for intra-articular sacroiliac (SI) joint injections and SI joint fusion (minimally invasive and open). It excludes radiofrequency ablation and defines which diagnostic procedures (e.g., sacral lateral branch nerve blocks) are considered unproven.

Policy Summary

PayerUnitedHealthcare

PolicySacroiliac Joint Interventions (for Kentucky Only)

Policy CodePolicy CS200KY.14

Change TypeCode list update

Effective DateApr 1, 2026

Next Review Date

Key ActionDocument medical history, exam, diagnostic test/procedure results, and meet InterQual criteria to support coverage for SIJ injections and fusion.

SourceLink

POLICY UPDATE CHANGES

Updated list of applicable CPT codes to reflect annual edits; revised description for 27278 and 27279.

4Procedure codes referenced

InterQualPrimary clinical criteria source

unprovenSacral lateral branch nerve blocks stance

TTI supportedTitanium Triangular Implant (iFuse) evidence strength

Required diagnostic SIJ block

6Minimum conservative treatment duration (months)

Coverage Summary

This UnitedHealthcare Kentucky medical policy (CS200KY.14) addresses intra-articular sacroiliac (SI) joint injections and SI joint fusion (minimally invasive and open) and relies on InterQual® as the primary clinical criteria source for authorization determinations. The policy takes a mixed coverage stance: SIJ injections are considered proven and medically necessary in certain circumstances per InterQual; minimally invasive SIJ fusion using a Titanium Triangular Implant (TTI) system (e.g., iFuse) is supported and described as proven and medically necessary in specified circumstances with InterQual (and client-defined InterQual) criteria; evidence for other implant systems and approaches (for example cylindrical threaded implants, LinQ, SI-LOK, Rialto, and posterior/allograft techniques) is limited or low quality and considered mixed/insufficient for broad coverage. The policy also excludes radiofrequency ablation for SI joint pain and deems sacral lateral branch nerve blocks as diagnostic tools prior to RFA unproven.

Key thresholds and quick facts

Diagnostic SIJ block requirement≥ 75% pain reduction documented for the expected duration of the anesthetic on two separate occasions

Minimum conservative treatment duration>= 6 months of intensive non-surgical treatment (medication optimization, activity modification, active therapeutic exercise); may include NSAIDs and/or opioids if not contraindicated

Pain severity threshold (ISASS)Pain rating at least 5 on 0–10 numeric rating scale

Confirmatory diagnostic step before fusionPain must be confirmed with a diagnostic SIJ block prior to minimally invasive SIJ fusion

Coverage decision authorityPolicy defers to InterQual clinical criteria for specific medical necessity determinations (SIJ Injection and SIJ Fusion)

Medical Necessity Criteria

Sacroiliac (SI) Joint Injections

Covered when ALL of the following are met:

SI joint injections are proven and medically necessary in certain circumstances; for specific medical necessity clinical coverage criteria, refer to InterQual® CP: Procedures, Sacroiliac (SI) Joint Injection

Policy delegates detailed clinical criteria to InterQual criteria

Sacral Lateral Branch Nerve Blocks (diagnostic prior to RFA)

Coverage stance:

Sacral lateral branch nerve blocks as a diagnostic tool prior to radiofrequency ablation are unproven and not medically necessary due to insufficient evidence of efficacy

Sacroiliac Joint Fusion (SIJF)

Covered when ALL of the following are met or per referenced InterQual criteria:

Pathways for coverage

Applicable Codes

Applicable CPT / Procedure Codes (reference only)CPT

27278	Arthrodesis, sacroiliac joint, percutaneous or minimally invasive, with image guidance, includes obtaining bone graft when performed, unilateral; placement of intra-articular device(s), with 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 ileum and the lateral cortex of the sacrum
27280	Arthrodesis, sacroiliac joint, open, includes obtaining bone graft, including instrumentation, when performed
64451	Injection(s), anesthetic agent(s) and/or steroid; nerves innervating the sacroiliac joint, with image guidance (i.e., fluoroscopy or computed tomography)

Provider Actions & Authorization Requirements

Prior Authorization

Reference to External Criteria for Prior Authorization

Coverage and medical necessity determinations defer to InterQual CP criteria (Sacroiliac Joint Injection and Sacroiliac Joint Fusion). Providers must meet the referenced InterQual criteria to support coverage and prior authorization requests.

Documentation Required

Medical record documentation requirement

The patient's medical record must contain documentation that fully supports the medical necessity for the requested services, including relevant medical history, physical examination, and results of pertinent diagnostic tests or procedures. Documentation must be legible, maintained in the patient's medical record, and made available upon request.

History
Physical examination

Background & Evidence Summary

The policy summarizes available evidence, guideline positions, and technology assessments related to SIJ injections and fusion. It highlights stronger, higher-quality evidence supporting minimally invasive lateral transiliac approaches and the iFuse/Titanium Triangular Implant (TTI) system (including randomized trials, long-term follow-up, meta-analyses, and guidance such as NICE and ISASS), and notes that evidence for other implants or techniques (e.g., cylindrical threaded implants, LinQ, SI-LOK, Rialto, posterior allograft approaches) is limited, noncomparative, or very low quality per ECRI, Hayes, and multiple systematic reviews.

Evidence Source	Summary
Ghaddaf et al. (2024) meta-analysis
Systematic review/meta-analysis of MIS SIJ fusion using triangular titanium implants (TTI) vs nonoperative management (8 articles, 3 trials, 423 participants) reporting significant reductions in pain and ODI, no higher adverse event rate, and decreased opioid use; notes limited evidence for other implant systems.
Whang et al. (2023) systematic review
Meta-analysis of 57 cohorts (2,851 individuals) stratified by technique (LTI, PLTI, PI); lateral transiliac (LTI) approaches showed superior efficacy; only iFuse (TTI) has Level 1 evidence and independent radiographic fusion confirmation.
INSITE / SIFI / LOIS trials (Polly, Darr et al.)
Randomized trials and long-term prospective follow-ups of lateral transiliac fusion with the iFuse TTI system demonstrating clinically meaningful improvements in pain and disability, sustained benefits up to 4–5 years with high rates of satisfaction and radiographic evidence of fusion.
ECRI / Hayes assessments
Technology assessments finding strong evidence for iFuse (TTI) versus nonsurgical care; ECRI and Hayes report limited or very-low-quality evidence for non-TTI systems (LinQ, Rialto, SI-LOK, cylindrical threaded implants) and call for comparative RCTs and longer follow-up.
Selected evidence sources
Additional systematic reviews, RCTs, cohort studies, and guideline statements (NICE, NASS, ISASS, ASPN) collectively support evaluation and selective coverage of minimally invasive SIJ fusion—particularly lateral transiliac approaches with TTI—while highlighting limited evidence for alternative implants.

Definitions (key terms)

Provocative TestsPhysical maneuvers performed to reproduce typical SI region pain (e.g., thigh thrust, compression, Gaenslen's, distraction, Patrick's/FABER)

Sacroiliac Joint Fusion (Arthrodesis)Surgical joining of the sacrum and ilium to stabilize the SI joint; can be minimally invasive or open

Titanium Triangular Implant (TTI)SIJ implant (example: iFuse) used in minimally invasive SIJ fusion intended to stabilize the joint

Sacretectomy/Partial Sacretectomy

Revision History

2026-04-01material_changeLatest

Applicable CPT codes updated to reflect annual edits; revised descriptions for CPT codes 27278 and 27279. Supporting information: previous policy version CS200KY.13 archived.

Policy Summary

PayerUnitedHealthcare

PolicySacroiliac Joint Interventions (for Kentucky Only)

Policy CodePolicy CS200KY.14

Change TypeCode list update

Effective DateApr 1, 2026

Next Review Date

Key ActionDocument medical history, exam, diagnostic test/procedure results, and meet InterQual criteria to support coverage for SIJ injections and fusion.

SourceLink

On This Page

InterQual CP: Procedures, Sacroiliac (SI) Joint Fusion: Medical necessity clinical coverage criteria defined in InterQual CP: Procedures, Sacroiliac (SI) Joint Fusion
Refer to InterQual for specifics
InterQual Client Defined CP: Procedures Sacroiliac (SI) Joint Fusion (Custom) - UHG: Minimally invasive joint fusion for degenerative sacroiliac disease using a Titanium Triangular Implant System is proven and medically necessary in certain circumstances per InterQual Client Defined criteria
Refer to client-defined InterQual criteria

Not covered indications: Fusion of the Sacroiliac Joint for treatment of back pain presumed to originate from the SI joint is unproven and not medically necessary for all other indications not addressed in the above InterQual criteria due to insufficient evidence of efficacy

Medically Necessary Criteria for Minimally Invasive SIJ Fusion

Covered when ALL of the following are met:

Patient has chronic sacroiliac joint (SIJ) pain.

Patient has responded insufficiently to at least six months of non-surgical treatment consisting of non-steroidal anti-inflammatory drugs and/or opioids (if not contraindicated) and one or more of the following: rest, physical therapy, SIJ steroid injection.>= 6 months

Failure to respond means continued pain that interferes with activities of daily living and/or results in functional disability.

Other diagnoses that could be responsible for the patient's ongoing pain or disability have been ruled out (e.g., L5/S1 compression, hip osteoarthritis).

Providers must document evaluation that rule out additional or alternative diagnoses

Pain is confirmed with a diagnostic SIJ block.

Minimally invasive SIJ fusion is not indicated if pain is not confirmed with a diagnostic SIJ block.

Not Indicated / Contraindications for Minimally Invasive SIJ Fusion

Procedure is not indicated when ANY of the following are present:

Less than six months of back pain.< 6 months

Failure to pursue conservative treatment of the SIJ (unless contra-indicated).

Pain not confirmed with a diagnostic SIJ block.

Existence of other pathology that could explain the patient's pain.

Diagnostic test/procedure results

Records must be available upon request

Documentation Required

Document conservative treatment and response

Providers must document at least six months of non-surgical treatment and the patient's response. Documentation should show continued pain that interferes with activities of daily living or results in functional disability despite therapy.

Minimum 6 months of non-surgical treatment (e.g., NSAIDs and/or opioids if not contraindicated, rest, physical therapy, SIJ steroid injection)
Evidence of continued pain impacting ADLs or causing functional disability

Documentation Required

Rule out alternative diagnoses

Documentation must show that other potential causes of the patient's pain have been evaluated and excluded. Examples of alternative diagnoses to rule out include lumbar spine pathology (e.g., L5/S1 compression) and hip osteoarthritis.

Evaluation and exclusion of L5/S1 compression
Evaluation and exclusion of hip osteoarthritis
Imaging as needed to exclude other explanatory pathology

Prior Authorization

Diagnostic confirmation requirement

Pain must be confirmed with a diagnostic image-guided intra-articular sacroiliac joint (SIJ) block prior to minimally invasive SIJ fusion; lack of diagnostic confirmation is a contraindication to fusion.

Diagnostic SIJ block requirement: ≥ 75% pain reduction for the expected duration of the anesthetic on two separate occasions

Denial Risk

Unproven diagnostic procedure denial risk

Claims for sacral lateral branch nerve blocks used as a diagnostic tool prior to radiofrequency ablation are considered unproven and not medically necessary; such claims may be denied.

Removal or partial removal of the sacrum with reconstruction using spinal instrumentation