Summary & Overview
CPT 15750: Free Fascial Flap with Microvascular Anastomosis
CPT 15750 represents a specialized reconstructive surgery: a free fascial flap with microvascular anastomosis. This procedure is used to repair complex soft-tissue defects by transplanting fascial tissue and reestablishing blood supply through microsurgical vascular connections. Nationally, this code is relevant for surgical specialties performing advanced reconstruction, including plastic and reconstructive surgery and complex hand surgery, and it has implications for inpatient surgical pathways, resource use, and perioperative care.
Key payers examined in the analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Coverage and payment policies from these payers influence prior authorization practices, billing requirements, and inpatient utilization for microvascular flap procedures.
Readers will find a concise briefing on clinical context and coding scope for CPT 15750, comparisons to closely related flap procedure codes, common billing modifiers and scenarios that affect claim adjudication, and typical ICD-10 diagnosis contexts that justify reconstruction. The report also summarizes payer policy themes and typical site-of-service considerations relevant to inpatient settings. Data not available in the input is noted where applicable. This summary is intended to inform coding, billing, and policy stakeholders about the procedural definition, clinical role, and payer landscape surrounding CPT 15750 at a national level.
CPT Code Overview
CPT 15750 describes a free fascial flap with microvascular anastomosis, a surgical repair procedure in which fascial tissue is transplanted and vascular supply is reestablished via microvascular suturing. This code applies to flap surgery intended to reconstruct soft tissue defects by transferring fascial tissue from a donor site to a recipient site and creating new blood flow connections.
Service Type: Surgical repair (flap surgery)
Typical Site of Service: Inpatient Hospital (POS 21)
Clinical & Coding Specifications
Clinical Context
A 35-year-old patient presents to the emergency department after a traumatic hand injury with a complete amputation of the thumb and complex soft tissue loss of adjacent digits. The patient is admitted to the inpatient hospital (POS 21) for operative management. The surgical team (plastic surgery and hand surgery) performs a free fascial flap with microvascular anastomosis to reconstruct soft tissue defects and provide coverage for exposed tendons and neurovascular structures, followed by inpatient postoperative monitoring for flap perfusion and microvascular complications. Typical workflow includes preoperative assessment, intraoperative harvest and microvascular transfer of the fascial flap, anastomosis under microscopy, and postoperative inpatient observation with serial flap checks and wound care.
Coding Specifications
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Modifiers:
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51- Multiple Procedures: Use when two or more procedures are performed at the same operative session by the same provider; the primary procedure is reported normally and the secondary procedures may be reported with modifier51according to payer billing rules. -
59- Distinct Procedural Service: Use when a procedure or service is distinct or independent from other services performed on the same day; applies when documentation supports separate anatomical sites, separate sessions, or separate encounters. -
Provider Taxonomies:
| Taxonomy Code | Specialty |
|---|---|
208200000X | Plastic Surgery |
2086S0122X | Surgery of the Hand |
208600000X | Surgery |
Related Diagnoses
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S61.219A- Laceration without foreign body of unspecified finger without damage to nail, initial encounterRelevant as finger lacerations with soft tissue loss that may necessitate flap coverage and microvascular reconstruction.
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S68.119A- Complete traumatic amputation of unspecified thumb, initial encounterRelevant for severe traumatic digit loss requiring complex reconstruction, including free fascial flap procedures to restore coverage and support secondary reconstruction.
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T81.31XA- Disruption of external operation (surgical) wound, not elsewhere classified, initial encounterRelevant when prior surgical wounds have dehisced or disrupted, creating defects that may require flap reconstruction and microvascular repair.
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M79.89- Other specified soft tissue disordersRelevant for assorted soft tissue pathology or damage contributing to defects that may be managed with flap reconstruction.
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S61.219D- Laceration without foreign body of unspecified finger without damage to nail, subsequent encounterRelevant for follow-up encounters for finger lacerations where staged reconstruction or revision with flap coverage may occur.
Related CPT Codes
| CPT Code | Description | Relationship to 15750 |
|---|---|---|
15740 | Flap; island pedicle requiring identification and dissection of an anatomically named axial vessel | Alternative local/regional flap technique; may be selected instead of a free flap when pedicled transfer is appropriate. |
15756 | Free muscle or myocutaneous flap with microvascular anastomosis | Related free tissue transfer option when muscle or myocutaneous tissue is required rather than fascia. |
15758 | Free fascial flap with microvascular anastomosis (includes skin, fascial tissue, and blood vessels) planted at the repair site | Closely related; represents a variant that includes skin and fascial tissue—may be billed when skin is part of the transferred tissue. Commonly used together or as alternatives depending on tissue composition and recipient-site requirements. |
National Reimbursement Benchmarks
National commercial averages (BUCA) have a higher mean allowed rate ($1,125.73) than Medicare ($855.72) for CPT 15750, representing a difference of $270.01 in mean rates. Blue Cross Blue Shield and UnitedHealth Group show the highest mean commercial rates among the set, while Aetna reports the lowest mean.
Dispersion varies across payers: UnitedHealth Group and Cigna show the widest interquartile ranges (UHC: $937.00; Cigna: $890.50), indicating greater variability between the 25th and 75th percentiles. Medicare and Aetna present the tightest spreads (Medicare: $72.00; Aetna: $437.00), with Medicare being the most compressed. The table and chart below present the full breakdown of mean and percentile rates by payer.
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