Summary & Overview
CPT 15758: Free Fascial Flap with Microvascular Anastomosis
CPT code 15758 represents a reconstructive microvascular procedure — a free fascial flap with microvascular anastomosis — in which skin and underlying fascial tissue with its blood supply are harvested from a donor site and transplanted to a defect using microscopic vessel repair. This code captures complex, operative-level reconstructive work that is clinically critical for wound coverage, functional restoration, and salvage of tissue after trauma, oncologic resection, or chronic soft-tissue loss. Nationally, accurate coding for this procedure affects surgical case mix reporting, facility and professional reimbursement, and quality measurement in reconstructive surgery.
Key payers included in the analysis are Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise guide to the clinical context of the procedure, typical sites of service, and how this service is categorized in billing. The publication outlines common modifier usage (provided separately), payer coverage patterns where available, and benchmarking context for utilization and reimbursement. It also summarizes relevant policy and documentation considerations that influence claim acceptance and audit risk. Data not available in the input is noted where applicable, and the report is intended for national audiences including coding professionals, surgical teams, and payer policy analysts seeking a clear reference on CPT code 15758.
Billing Code Overview
CPT code 15758 describes a free fascial flap with microvascular anastomosis. The procedure involves harvesting a piece of skin with underlying fascial tissue and its blood supply from a donor site and transplanting (plating) it to a recipient site using microscopic techniques to connect the flap's vessels to vessels at the repair site.
Service type: Reconstructive microvascular free tissue transfer
Typical site of service: Operating room with microsurgical capabilities, commonly performed in hospital surgical suites or specialized ambulatory surgical centers equipped for complex reconstructive surgery.
Clinical & Coding Specifications
Clinical Context
A 52-year-old male sustained a traumatic lower-leg degloving injury with loss of skin and underlying soft tissue over the distal tibia after a motor vehicle collision. After initial resuscitation, wound debridement, and negative-pressure wound therapy, the reconstructive team plans a microvascular free fascial flap to provide well-vascularized soft-tissue coverage and restore contour over exposed bone and hardware. The procedure is performed in an operating room under general anesthesia. The surgical workflow includes preoperative imaging and vessel mapping, harvest of a free fascial flap (including skin and underlying fascia and pedicle vessels) from a donor site (for example, the anterolateral thigh or radial forearm), microsurgical end-to-end anastomosis of artery and vein(s) at the recipient site using an operating microscope or loupes, inset and fixation of the flap, donor-site closure, and postoperative monitoring in a post-anesthesia care unit and flap monitoring unit. Typical perioperative documentation includes indication, donor and recipient site descriptions, vessel size and quality, microsurgical technique, ischemia time, flap viability assessment, and any intraoperative complications.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | Use when reporting only the surgeon's professional component separate from technical services provided by a facility or another entity. |