Summary & Overview

CPT 20973: Great Toe Vascularized Bone Graft with Cutaneous Component

CPT code 20973 represents a specialized reconstructive surgery: harvesting vascularized bone from the great toe with an attached layer of skin to repair a bony defect and replace lost soft tissue. This complex procedure is clinically significant for limb salvage, traumatic reconstruction, and certain oncologic or infectious defects where both structural bone and soft-tissue coverage are required. Nationally, the code defines a resource-intensive microsurgical technique with implications for operative planning, perioperative care, and reimbursement policy.

Key payers typically involved in coverage decisions include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of what the code denotes, typical settings where the service is delivered, and the clinical context driving use. The publication outlines expected benchmarks and considerations for payers, highlights relevant coding relationships, and summarizes clinical indications that commonly prompt utilization of the procedure. It also flags where input was not provided in the source data (for example, associated taxonomies, specific ICD-10 pairings, and payer-specific reimbursement rates) and indicates that those items are not available in the input.

This summary is intended for clinicians, coding professionals, and payer policy analysts seeking a clear, national-level description of CPT code 20973 and the clinical service it represents.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicare20973CPTvascularized-bone-graftreconstructive-surgerymicrosurgerygreat-toe-donorsoft-tissue-reconstructionlimb-salvage

Billing Code Overview

CPT code 20973 describes a surgical procedure in which the provider harvests bone graft material from the great toe including its active vascular supply and an attached layer of cutaneous tissue (skin). The harvested vascularized bone and skin are transferred to fill a bony defect at the recipient site and to compensate for soft tissue loss resulting from trauma or disease.

Service type: Vascularized bone graft with cutaneous component (great toe donor site)

Typical site of service: Operating room or surgical suite, with possible inpatient or outpatient admission depending on case complexity and recipient-site requirements

Clinical & Coding Specifications

Clinical Context

A 45-year-old male construction worker presents after a crush injury to the distal phalanx of the right index finger with exposed bone and soft tissue loss. The defect is associated with devitalized bone that requires reconstruction to restore skeletal continuity and soft tissue coverage. After debridement and imaging confirm a segmental bony defect of the distal phalanx and loss of overlying skin, the orthopedic/plastic surgery team plans a vascularized bone graft harvested from the great toe including its vascular pedicle and a skin paddle to reconstruct the finger. The operative workflow includes preoperative vascular assessment of the donor toe, sterile preparation of both donor and recipient sites, harvest of the vascularized great toe bone and associated cutaneous tissue using microsurgical technique, transfer and inset into the finger defect with microvascular anastomosis, fixation of the graft to recipient bone, layered soft tissue closure, and postoperative monitoring for graft perfusion and wound healing. Typical perioperative documentation includes donor site laterality (RT/LT), indication and ICD-10 diagnosis, procedure note describing harvest of vascularized great toe bone with attached skin paddle (20973), materials used, microvascular anastomosis details, estimated blood loss, and postoperative plan for monitoring and weight-bearing restrictions. Typical sites of service are an inpatient operating room or ambulatory surgical center for complex reconstruction depending on acuity and comorbidities. Typical providers include orthopedic hand surgeons and plastic/reconstructive microsurgeons with appropriate taxonomy designations.

Coding Specifications

Modifier	Description	When to Use
`RT`	Right side	Use when the donor or recipient site is on the right side and payer requires laterality.
`LT`	Left side	Use when the donor or recipient site is on the left side and payer requires laterality.
`26`	Professional component	Use when billing only the physician's professional component separate from technical facility resources (rare for this global surgical code).
`TC`	Technical component	Use when billing only the technical component by the facility when applicable.
`50`	Bilateral procedure	Use when the procedure is performed bilaterally (both great toes as donors), if clinically performed and supported by documentation.
`22`	Increased procedural services	Use when documentation supports substantially greater work or complexity than typical for `20973`.
`52`	Reduced services	Use when the procedure is partially reduced or not completed as originally planned with appropriate documentation.
`53`	Discontinued procedure	Use when procedure is started but discontinued due to extenuating circumstances documented in the record.
`62`	Two surgeons	Use when two surgeons from different specialties work together as primary surgeons performing distinct portions of the procedure.
`66`	Surgical team	Use when a surgical team approach is employed and payer accepts team reporting.
`78`	Unplanned return to the operating room	Use for a related, unplanned return to the OR for a complication during the postoperative global period.
`79`	Data not available in the input.	Data not available in the input.
`QK`	Medical direction of two or three CRNAs	Use when the surgeon provides medical direction of CRNA services when applicable.
`QX`	CRNA service: performed with medical direction by a physician	Use when a CRNA provides anesthesia under physician direction and separate reporting is required.

Taxonomy Code	Specialty	Notes
207RH0000X	Orthopedic Surgery	Hand and upper extremity surgeons commonly perform reconstructive bone grafting and microsurgical transfer.
208C00000X	Plastic Surgery	Reconstructive and microsurgical surgeons performing composite tissue transfers and soft tissue coverage.
225100000X	General Surgery	In some centers, surgeons with reconstructive expertise may participate in complex limb/tissue reconstruction.
2080P0206X	Pediatric Plastic Surgery	Pediatric specialists perform similar procedures in children when applicable.
2080P0405X	Surgical Oncology	In limb salvage for tumor-related defects, surgical oncologists may collaborate on reconstruction.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`S68.031A`	Amputation of right index finger, initial encounter	Distal finger injuries with bone loss or amputation often necessitate vascularized bone and soft tissue reconstruction.
`S68.032A`	Amputation of left index finger, initial encounter	Same relevance for left-sided injuries requiring reconstruction.
`S67.891A`	Other injury of right hand, initial encounter	Represents complex traumatic hand injuries with bone and soft tissue defects that may need a vascularized graft.
`S67.892A`	Other injury of left hand, initial encounter	Left-hand counterpart for complex traumatic injuries.
`M86.172`	Chronic osteomyelitis, right hand	Chronic bone infection causing segmental bone loss that can be treated with vascularized bone grafting after debridement.
`M86.171`	Chronic osteomyelitis, left hand	Left-hand chronic infection requiring reconstruction.
`T79.A11A`	Traumatic compartment syndrome of right upper limb, initial encounter	Severe soft tissue injury with devascularized segments that may require vascularized tissue transfer for salvage.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`19364`	Breast reconstruction with other technique, includes free flap; includes microsurgical anastomosis	Microsurgical technique example — demonstrates principles of free tissue transfer and microvascular anastomosis relevant to vascularized bone grafts.
`20969`	Vascularized osteocutaneous graft, any donor site, includes microvascular anastomosis	Closely related code describing vascularized osteocutaneous grafts from other donor sites; overlaps in technique and reporting considerations with `20973`.
`11042`	Debridement; skin, subcutaneous tissue, and muscle — first 20 sq cm or less	Common debridement code for preparing an infected or traumatic recipient site prior to grafting.
`29848`	Arthroscopy, wrist, surgical; limited	May be used when concomitant arthroscopic evaluation or release is performed during reconstructive procedures of the hand/wrist.
`20670`	Removal of implant; deep (e.g., buried wire, pin, screw, metal band, nail, or rod)	Used when removal of existing hardware is required before placement and fixation of the vascularized graft.