Summary & Overview
HCPCS L6940: External Power Elbow Disarticulation Prosthesis
HCPCS Level II code L6940 denotes an externally powered elbow disarticulation prosthesis with a molded inner socket, removable humeral shell, outside locking hinges, forearm, Otto Bock or equivalent switch, cables, two batteries and one charger, and switch control of the terminal device. Nationally, this code represents complex upper-limb prosthetic devices used in rehabilitation and durable medical equipment (DME) programs and is relevant to clinical teams, prosthetists, suppliers, and payers managing coverage of advanced prosthetic technology. Key payers included in the analysis are Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare.
Readers will learn the clinical context for L6940, typical sites of service, and what this code covers in terms of device components and intended patient population. The publication provides benchmarks and coverage considerations, highlights policy updates affecting HCPCS Level II billing for powered upper-limb prostheses, and summarizes common billing modifiers and supporting documentation practices. The content aims to help clinicians, prosthetic suppliers, and policy analysts understand how L6940 is classified, what services it represents, and where to focus documentation and billing efforts when seeking payment for complex externally powered elbow disarticulation prostheses. Data not available in the input for associated taxonomies, ICD-10 diagnoses, and related codes is noted in the detailed sections.
Billing Code Overview
HCPCS Level II code L6940 describes an external power elbow disarticulation prosthesis with a molded inner socket, removable humeral shell, outside locking hinges, forearm component, Otto Bock or equal switch, cables, two batteries and one charger, and switch control of the terminal device. The device is an externally powered upper-limb prosthesis designed for individuals with elbow disarticulation-level limb loss.
Service Type: Prosthetic upper-limb device — externally powered elbow disarticulation prosthesis
Typical Site of Service: Outpatient prosthetics clinic or durable medical equipment supplier
Clinical & Coding Specifications
Clinical Context
A 48-year-old patient with a transhumeral traumatic amputation proximal to the elbow presents to a multidisciplinary prosthetics clinic for fitting of an external power elbow disarticulation prosthesis. The patient has a healed residual limb with mature soft-tissue coverage and sufficient range of motion and cognitive ability to operate myoelectric or switch-controlled components. The clinical workflow includes: pre-prosthetic evaluation by a prosthetist and physiatrist; residual-limb casting or digital scanning for a molded inner socket; fabrication of a removable humeral shell; selection and integration of outside locking hinges and a forearm component; incorporation of an Otto Bock or equivalent switch control system with cabling, two batteries and one charger; bench alignment and component testing; initial fitting and gait/functional training focusing on donning/doffing, switch operation, and activities of daily living; follow-up adjustments and periodic maintenance. Typical site of service is an outpatient prosthetics and orthotics clinic or a hospital-based prosthetics department with access to fabrication labs and physical/occupational therapy services.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
RT / LT | Right or Left laterality modifier (commonly used though not in provided list) | Use to indicate side of the prosthesis when payer requires laterality; if payer uses for upper extremity, use that instead. |