Summary & Overview
CPT 27427: Reconstruction of Extra‑Articular Knee Ligaments
CPT code 27427 represents surgical reconstruction of extra-articular knee ligaments, a procedure used to restore lateral or medial ligamentous stability outside the knee joint and may include graft reinforcement. Nationally, this code is relevant to orthopedic and sports medicine surgical practices, facility billing, and payers managing musculoskeletal care pathways. It is commonly billed for patients with ligament injuries requiring operative stabilization when extra-articular structures are the target.
Key payers included in the analysis are Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will gain a concise overview of the clinical context and typical sites of care for procedures billed under CPT code 27427, plus practical billing implications such as common service settings and how the code is used in surgical practice. The publication also summarizes benchmark topics and policy updates affecting orthopedic surgical reimbursement and coding practices, and provides clinical context to help align documentation with the code description.
This summary is intended for a national audience of clinicians, billing professionals, and policy analysts seeking clear guidance on what the code represents, which payers commonly cover it, and the types of information that affect reimbursement and utilization.
Billing Code Overview
CPT code 27427 describes a surgical procedure to reconstruct extra-articular ligaments of the knee, including optional use of a graft to reinforce the repair. Extra-articular ligaments are the ligaments located outside the knee joint and the procedure focuses on restoring stability to these structures.
Service type: Surgical — ligament reconstruction/repair of the knee (extra-articular)
Typical site of service: Hospital operating room or ambulatory surgical center, reflecting an operative orthopedic procedure that may require general or regional anesthesia and intraoperative sterile technique.
Clinical & Coding Specifications
Clinical Context
A 28-year-old male recreational soccer player presents with persistent lateral knee instability after a remote twisting injury. Clinical exam demonstrates positive varus stress and the provider diagnoses chronic posterolateral corner laxity with attenuation of extra-articular stabilizers. Imaging including MRI confirms damage primarily to the lateral collateral ligament and associated posterolateral structures without intra-articular ligament reconstruction needs. The surgical plan is an open extra-articular ligament reconstruction of the knee with possible graft reinforcement to restore stability.
The clinical workflow includes preoperative evaluation and clearance, informed consent detailing risks and expected recovery, operating room preparation with regional or general anesthesia, open reconstruction of the extra-articular ligament(s) often using autograft or allograft reinforcement, intraoperative assessment of knee stability, wound closure, and postoperative recovery with immobilization and a rehabilitation plan coordinated by orthopedics and physical therapy. Typical follow-up visits include wound check, suture removal, progressive range-of-motion and strengthening milestones, and final assessment of stability and function.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | When separate billing occurs for the surgeon’s professional service and a separate technical component is billed |