Summary & Overview

CPT 20957: Vascularized Metatarsal Bone Graft for Major Defect

CPT code 20957 denotes a vascularized metatarsal bone graft: harvesting metatarsal bone with its arterial and venous supply and transplanting it to reconstruct a major bone defect with restoration of blood flow. This procedure supports faster incorporation and bone healing at complex recipient sites and is important in limb salvage, reconstructive orthopedic and podiatric surgery. Nationally, the code matters for hospitals, surgical specialists, and payers because it represents a technically complex, resource-intensive reconstructive service with implications for coverage policy and clinical pathways.

Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will get a concise clinical definition and service context, a summary of typical sites of service, and an outline of common billing considerations. The publication provides benchmarks where available, discusses relevant coverage and policy themes, and situates the procedure within clinical practice for major bone defect reconstruction. It highlights the clinical rationale for vascularized grafting and what clinicians and billing professionals should expect when documenting and coding this procedure.

Data not available in the input: Associated taxonomies, specific ICD-10 diagnoses, related codes, and payer-specific reimbursement rates.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicareCPT 20957vascularized bone graftmetatarsal graftorthopedic reconstructionpodiatric surgerysurgical billingreconstructive surgery

Billing Code Overview

CPT code 20957 describes a surgical procedure in which a provider harvests bone graft material from the metatarsal bone along with its intact vascular supply (arteries and veins) and transplants it to fill a major bone defect at a recipient site. The retained vascular supply is reestablished at the recipient site to promote faster healing and bone growth.

Service type: Vascularized metatarsal bone grafting for reconstruction of major bone defects
Typical site of service: Inpatient or outpatient surgical setting—commonly performed in operating rooms for reconstructive orthopedic or podiatric procedures under sterile conditions

Clinical & Coding Specifications

Clinical Context

A 52-year-old male presents with a segmental distal tibial bone loss after an open, comminuted fracture complicated by infection and nonunion. Prior internal fixation failed and the wound has been debrided; reconstruction requires vascularized bone transfer to restore structural continuity and promote rapid revascularization. The orthopedic or reconstructive microsurgeon obtains a vascularized metatarsal bone graft (including arterial and venous pedicle) to fill the major tibial defect at the recipient site. The operative workflow includes preoperative vascular and imaging assessment, harvest of the metatarsal with microsurgical dissection of its vascular pedicle, preparation of the recipient site with debridement and fixation, microvascular anastomosis of arteries and veins to recipient vessels, inset of the graft to restore length and alignment, and layered closure with postoperative monitoring of graft perfusion in a monitored inpatient setting. Typical perioperative care includes antibiotics, anticoagulation as indicated, serial neurovascular checks, and wound and flap monitoring in the immediate postoperative period. Typical sites of service are inpatient operating room or ambulatory surgery center with microsurgical capability depending on case complexity and patient comorbidity. Common clinical indications include large segmental bone defects from trauma, tumor resection, or chronic osteomyelitis requiring vascularized structural bone transfer for healing and limb salvage.

Coding Specifications

Modifier	Description	When to Use
`62`	Two surgeons	Use when two surgeons work together as primary surgeons performing distinct portions of a complex microsurgical reconstruction.
`80`	Assistant surgeon	Use when an assistant surgeon performs part of the procedure under the primary surgeon.
`82`	Assistant surgeon (when qualified resident not available)	Use when a qualified resident is not available and an assistant surgeon provides assistance.
`51`	Multiple procedures	Use when more than one distinct procedural CPT code is billed on the same date of service.
`52`	Reduced services	Use when the procedure is partially reduced or not completed as originally planned.
`53`	Discontinued procedure	Use if the procedure was started but then terminated due to extenuating circumstances.
`22`	Increased procedural services	Use when the procedure requires significantly greater work than typical (document justification).
`23`	Unusual anesthesia	Use when general anesthesia is not used due to unusual circumstances and local/regional anesthesia is employed for an unusual reason.
`26`	Professional component	Use when billing only the professional component of a service that has a technical component (rare for this procedure).
`59`	Distinct procedural service (Note: code `59` is not in the provided list; omitted)	Data not available in the input.
`TC`	Technical component	Use when billing only the technical component; applicable if an institution bills separately for technical services.
`58`	Staged or related procedure or service by the same physician during the postoperative period	Use when a planned staged reconstruction occurs after the initial operation.
`76`	Repeat procedure by same physician (Note: code `76` is not in the provided list; omitted)	Data not available in the input.
`RT`	Right side	Use to identify the right anatomic site when laterality is required.

Taxonomy Code	Specialty	Notes
207L00000X	Orthopaedic Surgery	Orthopedic surgeons perform structural bone reconstruction and fixation.
207XS0101X	Orthopedic Hand Surgery	Microsurgical bone and soft tissue reconstruction for limb salvage and complex foot/ankle procedures.
208000000X	General Surgery	Surgical oncologists or general surgeons with microsurgical training may perform reconstructive transfers after tumor resection.
2084P0902X	Plastic and Reconstructive Surgery	Plastic surgeons commonly perform vascularized bone graft harvest and microvascular anastomosis for limb salvage.
2086S0122X	Vascular Surgery	Vascular surgeons may assist with recipient vessel preparation and microvascular anastomosis in complex reconstructions.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`M84.151A`	Pathological fracture, tibia, right leg, initial encounter	Pathological or nonunion fractures with bone loss may require vascularized bone transfer for structural repair.
`M84.152A`	Pathological fracture, tibia, left leg, initial encounter	As above for left-sided tibial defects requiring vascularized grafting.
`M86.172`	Chronic osteomyelitis, right tibia	Chronic infection with bone loss often necessitates debridement and vascularized bone transfer for eradication and reconstruction.
`S82.251A`	Displaced fracture of distal tibia, right, initial encounter for closed fracture	Traumatic segmental defects from comminuted fractures are common indications for vascularized bone graft.
`T84.84XA`	Infection and inflammatory reaction due to internal fixation device, initial encounter	Failed fixation with infection can lead to nonunion and bone loss requiring vascularized graft reconstruction.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`15738`	Muscle, myocutaneous, or fasciocutaneous free flap with microvascular anastomosis	Performed when simultaneous soft-tissue coverage is required with microvascular transfer alongside vascularized bone grafting.
`20955`	Vascularized fibula graft, includes microvascular anastomosis	Alternative vascularized structural bone graft option for larger segmental defects; used in similar reconstructive algorithms.
`20680`	Removal of implant; deep (e.g., removal of deep-seated hardware)	May be performed prior to definitive reconstruction to address infection or nonunion before grafting.
`27065`	Open treatment of pelvic or acetabular fracture (example of open reduction and internal fixation codes)	Representative of complex fixation codes; internal fixation or plating codes for recipient site stabilization are commonly billed in the same episode.
`69990`	Microscopic surgical technique, requiring use of an operating microscope	Billed when an operating microscope is used for microvascular anastomosis during the vascularized metatarsal graft procedure.