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CPT 27279: Unilateral Percutaneous Sacroiliac Joint Fusion

Headline: CPT code 27279: Unilateral percutaneous sacroiliac joint fusion with transarticular or intra‑articular implants

CPT code 27279 denotes a unilateral sacroiliac (SI) joint fusion performed via a percutaneous or minimally invasive approach, where implants traverse the joint and pierce cortical bone of the ilium and sacrum or involve intra‑articular devices with at least one cortical breach. The code matters nationally as utilization of minimally invasive SI joint fusion has grown with advances in implant technology and expanding indications for surgical management of SI joint dysfunction and pain.

This analysis covers major national payers: Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise explanation of the clinical service represented by the code, typical sites of service, and the payer landscape. The publication summarizes how the code is reported on claims and what elements define the billed service. It also outlines common modifiers associated with operative billing and highlights areas where policy language or coverage criteria commonly affect payment and prior authorization practice.

Intended readers will gain a clear operational understanding of CPT code 27279, including clinical context, billing considerations, and the payer mix addressed in this national overview.

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Billing Code Overview

CPT code 27279 describes a sacroiliac (SI) joint fusion performed using a percutaneous or minimally invasive approach. The procedure involves placement of transarticular implants that cross the SI joint and pierce the cortical bone of the ilium and sacrum, and/or intra‑articular implants with at least one implant piercing cortical bone. This code represents a unilateral SI joint fusion (one side only).

Service type: Minimally invasive surgical spine/pelvic procedure

Typical site of service: Hospital outpatient surgical department or ambulatory surgery center, reflecting a percutaneous/minimally invasive operative setting.

National Reimbursement Benchmarks

Medicare’s mean rate for CPT 27279 sits at $769.90, which is substantially below the BUCA average commercial mean of $4,109.90. That gap of $3,340.00 highlights a wide separation between government and average commercial reimbursements, with BUCA positioned well above Medicare in absolute dollars per claim.

Dispersion measured as the interquartile range (P75–P25) varies notably across payers: Blue Cross Blue Shield shows the widest IQR at $6,371.90, followed by UnitedHealth Group at $989.00 and Aetna at $505.00. Cigna’s IQR is $890.00 and BUCA’s IQR is $4, - wait — correcting: BUCA’s P75 $5,631.60 minus P25 $1,646.60 equals $3,985.00. Thus the tightest spread is Aetna ($505.00) and the largest spread is Blue Cross Blue Shield ($6,371.90), indicating substantial variability in commercial contract levels.

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CPT 27279: Unilateral Percutaneous Sacroiliac Joint Fusion

Headline: CPT code 27279: Unilateral percutaneous sacroiliac joint fusion with transarticular or intra‑articular implants

Intended readers will gain a clear operational understanding of CPT code 27279, including clinical context, billing considerations, and the payer mix addressed in this national overview.

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Billing Code Overview

Service type: Minimally invasive surgical spine/pelvic procedure

Typical site of service: Hospital outpatient surgical department or ambulatory surgery center, reflecting a percutaneous/minimally invasive operative setting.

National Reimbursement Benchmarks

National Payer Mean Reimbursement Rates

Clinical & Coding Specifications

Clinical Context

A 52-year-old patient presents with chronic unilateral sacroiliac (SI) joint pain refractory to conservative care including physical therapy, activity modification, NSAIDs, and image-guided SI joint injections. Pain is localized to the posterior superior iliac region, reproduces with provocative SI maneuvers, and diagnostic SI joint block provided significant temporary relief. After multidisciplinary evaluation and imaging (CT and/or MRI showing degenerative changes or joint disruption), the patient is scheduled for a unilateral minimally invasive sacroiliac joint fusion using percutaneous transarticular and/or intra-articular implants (CPT 27279).

The typical clinical workflow includes preoperative evaluation and optimization, informed consent discussing risks/benefits and implant specifics, preoperative imaging review, intraoperative fluoroscopic or CT guidance for implant placement across the joint with cortical bone purchase of ilium and sacrum, intraoperative neuromonitoring as indicated, wound closure and recovery in an ambulatory surgery center or hospital outpatient setting, and postoperative pain control with staged rehabilitation. Follow-up includes wound check, radiographic confirmation of hardware position, progressive activity advancement, and monitoring for union and symptom improvement.

Coding Specifications

Modifier	Description	When to Use
`62`	Two surgeons	Used when two surgeons perform distinct portions of the operative procedure requiring documentation of separate surgical work for `CPT 27279`.

| 66 | Surgical team | Used when a surgical team approach is documented for complex cases involving CPT 27279. |

| 50 | Bilateral procedure | Not applicable to CPT 27279 as described (unilateral); would be used only if payer allows bilateral reporting or anatomic bilateral service modifier is required. |

| 52 | Reduced services | Used when CPT 27279 is partially reduced or not completed as planned with documentation explaining the reduction. |

| 53 | Discontinued procedure | Used when the procedure represented by CPT 27279 is started but terminated due to extenuating circumstances. |

| 59 | Distinct procedural service | Used when another distinct procedure is performed on the same date that is not ordinarily reported with CPT 27279 to indicate separate services. |

| 78 | Return to OR for related procedure during global period | Used if the patient returns to the operating room for a related procedure to the original CPT 27279 during the global post-op period. |

| 79 | Unrelated procedure or service during global period | Used if an unrelated procedure is performed during the global period following CPT 27279. |

| RT | Right side | Used to report a procedure performed on the right side for laterality when required by payer for CPT 27279. |

| LT | Left side | Used to report a procedure performed on the left side for laterality when required by payer for CPT 27279. |

| AS | Ambulatory surgical center | Used to indicate the service was performed in an ambulatory surgical center when billing facility charges for CPT 27279. |

| 22 | Increased procedural services | Used when the work required for CPT 27279 is substantially greater than usual and supported by operative report. |

| 24 | Unrelated evaluation and management service by the same physician during postoperative period | Used when unrelated E/M services occur during the global period after CPT 27279. |

| 79 | Unrelated procedure or service during global period | Duplicate intentionally avoided; only listed once in practice. |

Taxonomy Code	Specialty	Notes
`2084P0805X`	Orthopaedic Spine Surgery	Orthopaedic surgeons commonly perform minimally invasive SI fusion.
`2084N0400X`	Neurological Surgery	Neurosurgeons with spine focus may perform SI fusion.
`207XS0102X`	Pain Medicine	Interventional pain specialists may evaluate, perform diagnostic blocks, and refer for fusion.
`207K00000X`	Physical Medicine & Rehabilitation	PM&R physicians participate in pre- and postoperative management and rehabilitation.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`M46.1`	Sacroiliitis, not elsewhere classified	Inflammatory or degenerative sacroiliitis can cause refractory SI joint pain leading to consideration of `CPT 27279`.

| M47.26 | Other spondylosis with radiculopathy, lumbar region | Lumbar degenerative changes can coexist with SI joint pathology; SI fusion may be considered when SI joint is primary pain generator. |

| M54.17 | Radiculopathy, lumbosacral region | Lumbosacral radiculopathy symptoms may overlap; diagnostic workup differentiates SI joint pain prior to CPT 27279. |

| M53.2X6 | Spinal instabilities, lumbosacral region (spondylolisthesis/ns) | Pelvic and lumbosacral instability can contribute to SI joint dysfunction and be an indication for fusion in select patients. |

| M99.23 | Subluxation complex (vertebral) of sacral region | Mechanical disruption of the sacroiliac articulation can be cited as a reason for surgical fusion. |

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`27096`	Injection procedure for sacroiliac joint, anesthetic/steroid, with image guidance (fluoroscopy or CT); single or multiple injections	Often used as a diagnostic or therapeutic procedure before deciding on `CPT 27279`; may document temporary pain relief after diagnostic block.

| 74000 | Radiologic guidance, fluoroscopic; with or without contrast (placeholder example) | Fluoroscopic guidance is commonly used intraoperatively during placement of implants for CPT 27279 (facility/technical component billing may use appropriate fluoroscopy codes). |

| 22845 | Anterior instrumentation; 3 to 6 vertebral segments | In cases with adjacent spinal fusion or multi-level stabilization, anterior or posterior spinal fusion instrumentation codes like 22845 may be billed for concurrent or staged procedures (code selection depends on spine levels and approach). |

| 22842 | Posterior segmental instrumentation (e.g., pedicle fixation); 3 to 6 vertebral segments | May be performed in the same patient with complex pelvic or lumbosacral stabilization when clinically indicated alongside CPT 27279. |

| 27096 | Injection procedure for sacroiliac joint, anesthetic/steroid, with image guidance; repeat listing avoided—see above | Included above as primary diagnostic/therapeutic precursor to CPT 27279. |

CPT 27278: Unilateral Minimally Invasive Sacroiliac Joint Fusion

CPT-27280-SACROILIAC-JOINT-FUSION-OPEN-WITH-AUTOGRAFT

CPT 27280: Open Sacroiliac Joint Fusion with Autograft and Instrumentation

CPT-27282-PUBIC-SYMPHYSIS-ARTHRODESIS-WITH-AUTOGRAFT-AND-FIXATION

CPT 27282: Pubic Symphysis Arthrodesis with Autologous Bone Graft and Fixation

CPT-27284-HIP-ARTHRODESIS-WITH-AUTOGRAFT

CPT 27284: Hip Arthrodesis with Autologous Bone Graft

CPT-27286-HIP-IMMOBILIZATION-WITH-GRAFT-AND-SUBTROCHANTERIC-OSTEOTOMY

CPT 27286: Hip Immobilization with Autologous Bone Graft and Osteotomy

References

1.CPT® Codes and Descriptions. AAPC. Retrieved Jul 29, 2026.
2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Jul 29, 2026.
3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Jul 29, 2026.

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Clinical & Coding Specifications

Clinical Context

Coding Specifications

Modifier	Description	When to Use
`62`	Two surgeons	Used when two surgeons perform distinct portions of the operative procedure requiring documentation of separate surgical work for `CPT 27279`.