Summary & Overview
CPT 24940: Upper-Extremity Muscle Loop for Prosthetic Attachment
CPT code 24940 covers surgical creation of a muscle loop in an amputated upper‑extremity stump to permit attachment and control of a prosthetic device via muscle contraction. This procedure is clinically important for restoring functional prosthetic control for amputees and has implications for surgical specialty practice patterns, prosthetic device integration, and payer coverage decisions nationwide. Key payers in the analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare.
Readers will gain a concise explanation of the clinical intent of CPT code 24940, the typical clinical and service settings where it is performed, and the payer landscape relevant to reimbursement and coverage. The publication summarizes benchmarks for utilization and payment where available, highlights policy and coding considerations affecting coverage and claims processing, and provides clinical context about how the procedure interfaces with prosthetic fitting and rehabilitation pathways. Data not available in the input will be noted as such in the full publication.
Billing Code Overview
CPT code 24940 describes a surgical procedure in which a loop of muscle in an amputated upper‑extremity stump is isolated, covered with skin, and prepared for attachment to a prosthetic device that is operated by contraction of the muscle loop. This procedure is a form of surgical prosthetic interface creation that enables a myoelectric or mechanically actuated prosthesis to be controlled by residual muscle activity.
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Service type: Surgical procedure for prosthetic muscle-loop creation and preparation
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Typical site of service: Operative setting such as an inpatient or outpatient surgical suite where limb amputation stump revision and prosthetic interface surgery are performed.
Clinical & Coding Specifications
Clinical Context
A 34-year-old male with a traumatic transradial amputation of the dominant right forearm presents for surgical creation of a myoelectric muscle loop (target muscle reinnervation or muscle loop for prosthetic control). The patient has completed preoperative prosthetic and rehabilitation evaluations and desires a prosthesis that uses residual muscle contractions to operate terminal devices. Preoperative planning includes identification of viable muscle bellies in the residual limb, assessing skin and soft-tissue coverage, and coordinating with the prosthetist. In the operating room under general anesthesia, the surgeon isolates a loop of residual muscle, fashions a myofascial or tendon loop, secures the loop beneath well-vascularized skin, and orients it for optimal excursion to be linked to an external or implanted prosthetic control system. Postoperative workflow includes wound care, pain control, suture removal, staged prosthetic fitting by an occupational therapist and prosthetist, and progressive training of muscle signals for device control. Typical site of service is an outpatient ambulatory surgery center or an inpatient hospital operating room depending on patient comorbidities and complexity of the case. Typical supporting clinicians include an orthopedic or plastic surgeon with limb-reconstruction expertise, an anesthesiologist, a certified prosthetist, and occupational therapy for rehabilitation.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
22 | Increased procedural services | Use when the procedure requires substantially greater work than usual (extensive dissection or reconstruction). |