Summary & Overview
HCPCS L5701: Replacement Above-Knee/Knee-Disarticulation Prosthetic Socket
HCPCS Level II code L5701 denotes a replacement prosthetic socket for above-knee or knee-disarticulation amputations, molded to a patient model and including the attachment plate. This code identifies a specialized durable medical equipment service critical to mobility and function for transfemoral and knee-disarticulation prosthesis users. Nationally, appropriate coding for prosthetic sockets affects access to custom devices, clinical outcomes, and payer coverage determinations.
Key payers covered include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare and Medicare. Readers will learn the clinical context for use of L5701, typical sites of service, and how payers approach coverage and reimbursement for custom prosthetic sockets. The publication summarizes benchmarks where available, common billing considerations, and recent policy developments relevant to prosthetic component replacement and custom fabrication.
The analysis provides practical reference material for billing staff, prosthetists, and policy analysts: it clarifies what L5701 represents, summarizes payer presence in the market, and outlines the content areas to review when managing claims for replacement transfemoral/knee-disarticulation sockets. Data not available in the input will be noted where applicable.
Billing Code Overview
HCPCS Level II code L5701 describes a replacement above-knee or knee-disarticulation prosthetic socket that is molded to a patient model and includes the attachment plate. The service represented is prosthetic socket fabrication and replacement for transfemoral or knee-disarticulation amputees. The typical site of service is prosthetics and orthotics clinics or outpatient rehabilitation facilities, where custom sockets are fitted and aligned for patient use.
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Clinical & Coding Specifications
Clinical Context
A 62-year-old patient with a transtibial amputation who previously underwent an above-knee (transfemoral) or knee disarticulation presents for prosthetic socket replacement using a custom-molded socket and attachment plate. The patient reports progressive socket discomfort, skin irritation, and poor prosthetic fit after weight gain and changes in residual-limb volume. The clinical workflow includes a prosthetist or orthotist evaluation, residual-limb inspection for skin breakdown or contracture, measurement and casting or digital scanning of the residual limb to create a custom model, fabrication of a new socket and attachment plate, fitting and alignment in the clinic, adjustments for comfort and gait, and documentation of functional status and mobility goals.
Typical site of service: outpatient prosthetics clinic, orthotics and prosthetics facility, or specialty rehabilitation clinic.
Typical patient scenario: elderly or adult patient with prior above-knee amputation receiving a replacement socket for improved fit and function, often with gait training and follow-up adjustments.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
LT | Left side | When the socket is for the left limb |
RT |