Summary & Overview
HCPCS L5724: Exoskeletal Knee-Shin System with Fluid Swing Phase Control
HCPCS Level II code L5724 represents the addition of an exoskeletal knee-shin system, single axis, with fluid swing phase control — an orthotic component used to manage knee motion during the swing phase of gait. This code matters nationally because it identifies a commonly prescribed orthotic upgrade that can affect claims processing, durable medical equipment utilization, and patient mobility outcomes.
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 role of the device, typical sites of service where the component is provided, and the payer landscape addressing coverage and billing considerations. The publication outlines benchmarks for utilization and reimbursement practices where available, notes recent policy updates affecting orthotic component coding, and provides clinical context on when a fluid swing phase control knee-shin unit is used.
The article serves clinicians, billing professionals, and policy analysts by clarifying the code definition, situating the component within orthotic service lines, and summarizing payer-specific coverage tendencies. Data not available in the input for associated taxonomies, ICD-10 diagnoses, and related codes is noted where relevant.
Billing Code Overview
HCPCS Level II code L5724 describes the addition of an exoskeletal knee-shin system, single axis, with fluid swing phase control. This code denotes a component added to a lower-limb orthotic system designed to provide controlled knee flexion and extension during the swing phase of gait.
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Service type: Orthotic component addition (exoskeletal knee-shin system)
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Typical site of service: Durable medical equipment and prosthetics/orthotics settings, outpatient clinics, rehabilitation facilities, and provider offices where orthotic devices are evaluated and fitted.
Data not available in the input for associated taxonomies, ICD-10 diagnoses, and related codes.
Clinical & Coding Specifications
Clinical Context
A 54-year-old patient with a transfemoral or knee-level limb preservation history presents for orthotic management of a flaccid or weak knee following stroke and chronic knee instability. The patient is evaluated by an orthotist in an outpatient prosthetics/orthotics clinic for gait insecurity and frequent trips during the swing phase. A clinical gait assessment documents knee instability during swing and inadequate foot clearance. After measurement and casting, the orthotist selects an exoskeletal knee-shin addition with a single-axis knee incorporating fluid swing-phase control to be added to the patient’s existing orthosis or prosthetic system. The workflow includes a pre-fitting evaluation, fabrication or ordering of the L5724 component, fitting and alignment session, gait training, and post-delivery follow-up to document functional improvement and to collect objective gait and patient-reported outcome measures. Typical sites of service are outpatient orthotics and prosthetics clinics, rehabilitation hospitals, or specialty orthopedic clinics where orthotists and prosthetists provide device fittings. Payers involved may include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare, following their specific coverage and documentation requirements for orthotic component additions.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | Use when billing the professional fitting or modification component separately from the technical/device charge, if applicable. |