Summary & Overview
HCPCS L5676: Additions to Below-Knee Orthosis, Single-Axis Knee Joints
HCPCS Level II code L5676 covers additions to lower-extremity orthoses: a matched pair of single-axis knee joints for below-knee/knee joint orthotic systems. This code is relevant nationally for durable medical equipment (DME) suppliers, orthotists, and payers managing coverage of orthotic component replacements and upgrades that affect patient mobility and device function. It denotes a component-level supply rather than a full custom orthosis, which impacts billing, documentation, and benefit determinations.
Key payers in national analyses include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of typical coverage contexts, coding and billing considerations tied to component replacements, and the clinical role of single-axis knee joints in below-knee orthotic systems. The publication summarizes common modifiers and payer practices (where available), typical sites of service, and utility in ambulatory and outpatient DME settings. It also outlines what documentation commonly supports medical necessity determinations and how this code fits into broader orthotics supply chains.
Data not available in the input for associated taxonomies, ICD-10 diagnoses, related codes, and detailed payer-specific reimbursement benchmarks.
Billing Code Overview
HCPCS Level II code L5676 describes additions to lower extremity orthotic components, below knee, knee joints, single axis, pair. This code covers the supply and fitting of a matched pair of single-axis knee joints intended as additions or replacements to below-knee (BK) orthoses to provide controlled knee motion for lower extremity orthotic systems.
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Service type: Orthotic component provision and fitting
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Typical site of service: Outpatient durable medical equipment suppliers, orthotics and prosthetics clinics, and ambulatory surgical centers where orthotic fabrication and fitting occur
Clinical & Coding Specifications
Clinical Context
A 68-year-old patient with a transtibial (below-knee) amputation presents for prosthetic component adjustment and upgrade. The patient reports instability and limited knee flexion control within the current prosthetic knee joint assembly on the prosthesis that fits the residual limb below the knee. The prosthetist evaluates gait, observes medial-lateral instability and inappropriate sagittal plane control attributable to worn or inadequate single-axis knee joints, and determines that additions to the lower extremity prosthesis — specifically replacement or addition of a pair of single-axis knee joints for the below-knee prosthesis — are clinically indicated.
Typical clinical workflow:
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Referral from primary care or physiatry for prosthetic component evaluation following functional decline.
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Prosthetic evaluation including residual limb inspection, socket fit assessment, and gait analysis.
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Selection and ordering of appropriate prosthetic knee joint components documented as additions to the existing below-knee prosthesis.
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Fabrication and fitting appointment where the
L5676components (pair of single-axis knee joints) are installed, aligned, and tested. -
Follow-up visits for alignment tuning, patient education on donning/doffing and safety, and documentation of functional improvement.
Coding Specifications
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