Summary & Overview
CPT 27050: Open Sacroiliac Joint Biopsy, Soft Tissue
CPT code 27050 denotes an open surgical biopsy of the sacroiliac joint, where a provider makes an incision at the spine–pelvis junction to obtain soft tissue for diagnostic evaluation. The code captures a targeted invasive diagnostic procedure used in cases of suspected infection, inflammatory disease, malignancy, or unexplained sacroiliac pathology. Nationally, accurate coding for this procedure affects clinical documentation, pathology follow-up, and payment for operative services involving pelvic and spinal regions.
Key payers addressed in this profile include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of clinical context and service setting, typical sites of service, and common billing considerations associated with CPT code 27050. The publication summarizes benchmarks and policy-relevant elements that influence coverage and claim adjudication, highlights coding nuances tied to surgical biopsy services, and outlines areas where payers commonly require documentation to support medical necessity.
This resource is designed for coding professionals, surgical teams, and policy analysts seeking a clear, national-level summary of CPT code 27050, its clinical role, and the payer landscape relevant to sacroiliac joint open biopsy procedures.
Billing Code Overview
CPT code 27050 describes an open surgical biopsy of the sacroiliac joint, performed through an incision at the junction of the spine and pelvis to obtain soft tissue for pathologic examination. This procedure is a surgical biopsy intended to sample tissue from the sacroiliac joint to diagnose or evaluate disease processes affecting the joint.
Service type: Surgical procedure — open biopsy
Typical site of service: Operating room or ambulatory surgical center, with inpatient settings used when clinically indicated.
Clinical & Coding Specifications
Clinical Context
A typical patient is a 45–70 year-old adult presenting with persistent unilateral or bilateral posterior pelvic pain, tenderness over the sacroiliac joint, and limited ambulation despite conservative therapy. Imaging (MRI or CT) shows a suspicious sacroiliac joint lesion or evolving inflammatory change. After discussion, the orthopedic surgeon or interventional pain specialist schedules an open sacroiliac joint biopsy during a brief operative procedure to obtain soft-tissue samples for histopathology and microbiology. The workflow includes preoperative consent, targeted imaging review, brief general or regional anesthesia in an ambulatory surgery center or hospital operating room, a small incision over the sacroiliac joint, blunt and sharp dissection to expose the joint, sampling of soft tissue and synovium, hemostasis, and layered closure. Specimens are sent for frozen section or permanent pathology and culture as indicated. Postoperative care includes short observation, pain control, wound care instructions, and follow-up for pathology results and definitive management planning.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
22 | Increased procedural services | Use when work required is substantially greater than typical for 27050 (eg extensive dissection or prolonged operative time). |