Summary & Overview

CPT 15842: Free Muscle Transfer for Facial Reanimation

CPT code 15842 represents a microsurgical free muscle transfer used to reanimate the face in patients with facial nerve paralysis. The procedure involves harvesting muscle from donor sites such as the back, chest, abdomen, or thigh and reconnecting its tiny vessels to facial vasculature under a surgical microscope. Nationally, this code captures a resource-intensive reconstructive surgery performed by microsurgeons and plastic surgeons and is relevant for surgical quality, reimbursement policy, and access to specialized reconstructive care.

Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of the clinical context for facial reanimation using free muscle transfer, typical sites of service, and common billing practices. The publication outlines benchmark considerations, policy and coverage themes that affect authorization and payment, and clinical implications for coding and service delivery. Data not available in the input is noted where specific payer rates, taxonomies, or related ICD-10 diagnoses would normally appear.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicareCPT 15842facial reanimationmicrosurgeryfree muscle transferreconstructive surgeryplastic surgeryoperating roomsurgical coding

Billing Code Overview

CPT code 15842 describes microvascular free muscle transfer for facial reanimation, in which the provider removes a piece of muscle tissue (commonly from the back, chest, abdomen, or thigh) and transplants it to the face to restore a more normal appearance in a patient with facial nerve paralysis. The procedure requires use of a surgical microscope and microsurgical instruments to anastomose the tiny blood vessels of the grafted tissue to recipient facial vessels.

Service type: Microsurgical free muscle transfer for facial reanimation
Typical site of service: Operating room in an acute care hospital or ambulatory surgical center

Clinical & Coding Specifications

Clinical Context

A 48-year-old female with unilateral facial nerve paralysis following resection of a vestibular schwannoma presents with long-standing facial asymmetry, inability to smile, and oral incompetence. After multidisciplinary evaluation, the surgical team plans a free muscle transfer to restore voluntary facial motion. In the operating room under general anesthesia, the reconstructive surgeon harvests a segment of gracilis muscle from the medial thigh. Using a surgical microscope and microsurgical instruments, the surgeon performs microvascular anastomoses between the muscle's artery and vein and recipient facial vessels, and connects the muscle’s motor nerve to a donor nerve (e.g., masseteric nerve) to reinnervate the graft. Postoperative care includes monitoring in a post-anesthesia care unit or step-down setting for flap perfusion, serial flap checks, pain control, and early physical therapy for facial retraining over ensuing months.

Coding Specifications

Modifier	Description	When to Use
`62`	Two surgeons	When two surgeons of different specialties work together and each performs distinct portions of the procedure requiring their skills.
`66`	Surgical team	When the complexity requires a surgical team where multiple surgeons operate simultaneously on critical portions.
`26`	Professional component	When reporting only the physician’s professional component separate from technical services (rare for this global surgical code).
`50`	Bilateral procedure	When identical free muscle transfers are performed on both sides of the face during the same operative session.
`52`	Reduced services	When the procedure is partially reduced or not completed as originally planned.
`53`	Discontinued procedure	When the procedure is started but discontinued due to extenuating circumstances or patient safety concerns.
`80`	Assistant surgeon	When a surgical assistant (not a co-surgeon) is required and assists during the procedure.
`82`	Assistant surgeon (when a qualified resident is not available)	When an assistant surgeon is required and a resident is not available.
`22`	Increased procedural services	When the work required is substantially greater than typical (e.g., extensive scar revision, prolonged ischemia time, unusually complex anastomoses).
`23`	Unusual anesthesia	When general anesthesia is contraindicated and an unusual form of anesthesia is required (used infrequently with this CPT).
`63`	Procedure performed on infants less than 4 kg	If performed on an infant meeting weight criteria where this modifier is applicable.
`73`	Discontinued outpatient hospital/ambulatory surgery prior to anesthesia	When the outpatient procedure is discontinued prior to anesthesia administration.
`78`	Return to the operating room for a related procedure during the global period	When the patient returns to the OR for a complication related to the initial free muscle transfer within the global period.
`79`	Unrelated procedure or service by the same physician during the postoperative period	When an unrelated procedure is performed during the global period (note: `79` is not in the provided list; therefore it is omitted).

Taxonomy Code	Specialty	Notes
208100000X	Plastic Surgery	Microsurgical free flap reconstruction, facial reanimation procedures.
206E00000X	Oral and Maxillofacial Surgery	Facial soft tissue reconstruction and nerve-related procedures when involved in head and neck cases.
207Q00000X	Otolaryngology (ENT)	Management of facial nerve disorders and coordination of reinnervation procedures.
208000000X	General Surgery	Surgeons trained in complex reconstructive microsurgery in some centers.
207P00000X	Neurological Surgery	Involvement when facial nerve pathology originates from intracranial procedures or tumor resection.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`G52.0`	Bell's palsy	Acute facial nerve paralysis that may lead to chronic dysfunction requiring reanimation procedures.
`G51.0`	Bell's palsy (alternate indexing)	Facial nerve paralysis diagnosis encountered in facial reanimation candidates.
`G51.1`	Geniculate ganglionitis and herpes zoster oticus (Ramsay Hunt syndrome)	Infectious etiologies causing facial paralysis that can result in long-term deficits requiring muscle transfer.
`G51.9`	Facial nerve disorder, unspecified	Used when specific etiology is not otherwise specified and reanimation is indicated.
`C71.9`	Malignant neoplasm of brain, unspecified	Included when facial nerve sacrifice occurs during tumor resection necessitating reconstructive transfer (contextual example).
`S04.5XXA`	Injury of cranial nerve at neck and head level, initial encounter	Traumatic facial nerve injury leading to paralysis and need for reconstructive procedures.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`15736`	Muscle, myocutaneous, or fasciocutaneous free flap with microvascular anastomosis	Codes for free flap harvest and transfer of muscle or myocutaneous tissue; may be used for alternative or adjunctive free tissue transfers for facial reconstruction.
`15738`	Free full-thickness tissue transfer with microvascular anastomosis, including direct closure of donor site	Used when a composite free flap including skin and muscle is transferred for facial reconstruction.
`61618`	Repair of cranial nerve (facial nerve) by direct repair or grafting	May be performed in conjunction with reinnervation efforts or nerve grafting staged with muscle transfer.
`69990`	Microsurgical techniques, requiring use of operating microscope (list separately in addition to code for primary procedure)	Reported in addition to primary procedure when microsurgical techniques are distinctly reportable per payer guidance.
`21470`	Open treatment of facial fractures (complex)	May be performed prior to or during reconstructive planning if facial skeletal stabilization is required before muscle transfer.