Summary & Overview
HCPCS L5790: Above-Knee Exoskeletal Prosthetic Addition, Ultra-Light Material
HCPCS Level II code L5790 designates an addition to an exoskeletal above-knee prosthetic system fabricated from ultra-light materials such as titanium or carbon fiber. This code identifies a durable medical equipment component intended to improve structural support and mobility for transfemoral prosthesis users. Nationally, accurate use of L5790 affects claims processing, device classification, and appropriate benefit determination for prosthetic services.
Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. The publication provides a concise view of coverage considerations and coding benchmarks used by major commercial payers and the Medicare program. It also summarizes typical clinical contexts in which an ultra-light exoskeletal addition would be applied, and where that service is commonly furnished.
Readers will find: (1) a clear description of what L5790 represents and when it is used clinically; (2) payer coverage patterns and common billing practices across major payers and Medicare; and (3) the billing and documentation context necessary for claims submission, including common service settings. Data not provided in the input are noted as unavailable. This overview is designed for billing administrators, prosthetics providers, and policy analysts seeking a national-level summary of the code’s clinical and billing role.
Billing Code Overview
HCPCS Level II code L5790 represents an addition to an exoskeletal prosthetic system for above-knee amputation, constructed from ultra-light materials such as titanium or carbon fiber (or equivalent). The code describes a component added to an existing prosthetic limb to provide structural support and function for transfemoral (above-knee) prostheses.
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Service type: Prosthetic component addition (exoskeletal, structural)
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Typical site of service: Durable medical equipment/prosthetics provider setting or outpatient prosthetics clinic
Clinical & Coding Specifications
Clinical Context
A 45-year-old male with a transtibial amputation on the contralateral limb presents with an above-knee amputation on the right due to trauma and requires an exoskeletal above-knee prosthetic component fabricated from ultra-light materials such as titanium or carbon fiber. The prosthetist evaluates limb shape, residual limb volume, skin integrity, and functional goals (community ambulation, K3 activity level). A physician documents medical necessity, reviews vascular and orthopedic status, and orders the addition of an exoskeletal system (L5790) to the existing above-knee prosthesis. Fabrication occurs in the prosthetic lab; fitting, alignment, and initial gait training are performed in an outpatient prosthetics clinic or rehabilitation facility. Follow-up visits address fit adjustments, skin checks, and function-based modifications. Billing is submitted by the prosthetics supplier with the appropriate modifier(s) to indicate laterality, provider role, or extraordinary circumstances.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
LT | Left side | When the L5790 addition is for the left limb |
RT |