Ethnocare is proud to announce one of the most important milestones in our U.S. journey to date.
CMS has officially assigned the Overlay a dedicated HCPCS code, L5657, with a 2026 fee schedule effective April 1. This marks an important step forward in the recognition of the Overlay as a distinct solution for limb volume management in lower limb prosthetics.
For clinics across the United States, this update creates a clearer reimbursement pathway for a technology designed to address one of the most persistent challenges in prosthetic care: residual limb volume variation.
A Meaningful Reimbursement Milestone for Lower Limb Prosthetics
For years, clinicians have worked to help patients manage one of the most common and frustrating challenges in prosthetic care: limb volume variation.
Residual limb volume changes can affect socket fit, comfort, suspension, stability, and confidence throughout the day. For both the transtibial amputee and the transfemoral amputee, these fluctuations can lead to discomfort, movement inside the socket, reduced control, and difficulty maintaining a consistent fit.
That is why this reimbursement update matters.
The assignment of L5657 helps establish clearer recognition of the Overlay as a dedicated solution for limb volume management rather than a simple accessory. It also provides clinicians with a more predictable reimbursement pathway when delivering this technology as medically necessary.
Key reimbursement updates
- Dedicated HCPCS code: L5657
- Effective date: April 1
-
Billing status: L5657 is independent of other HCPCS codes and can be billed alongside suspension systems, liners, socks, and other components as medically necessary
What Is the Overlay?
The Overlay is Ethnocare’s air-based prosthetic device designed to help manage residual limb volume fluctuation and improve socket fit throughout the day.
Available in both TT2.0 and TF versions, the Overlay is designed for transtibial amputees and transfemoral amputees who experience changes in limb volume that affect comfort, fit, and stability.
Unlike traditional approaches that rely only on adding or removing prosthetic socks, the Overlay offers a dynamic way to help fill space created by daily volume loss or variation. The goal is to help clinicians and patients achieve a more consistent interface between the residual limb and the prosthetic socket.
Why Limb Volume Variation Remains a Major Clinical Challenge
Anyone working in lower limb prosthetics knows that socket fit is not static.
Residual limbs change over the course of the day due to activity level, temperature, fluid shifts, sitting time, standing time, and long-term limb changes. Even small fluctuations can affect the way a prosthesis feels and performs.
When limb volume variation is not well managed, patients may experience:
- reduced comfort
- loss of suspension
- pistoning or movement in the socket
- pressure points
- instability during walking or standing
- reduced confidence wearing the prosthesis for long periods
For many patients, prosthetic socks are the traditional first-line adjustment tool. They remain useful in many situations, but they do not always provide the level of fit optimization, cushioning, or interface consistency needed for patients with more significant or frequent volume changes.
This is where the Overlay can play an important role.
Overlay vs Prosthetic Socks: A Different Approach to Limb Volume Management
Prosthetic socks help accommodate changes in limb size by adding textile layers. They are familiar, simple, and widely used. But for some patients, socks alone may not fully solve the issue.
The Overlay was developed to offer a different approach to limb volume management by using an air-based structure designed to support fit and comfort in a more responsive way.
Clinicians use the Overlay when they want to help patients address challenges such as:
- recurring daily volume changes
- poor socket fit later in the day
- instability related to space inside the socket
- discomfort caused by uneven pressure distribution
- difficulty maintaining a secure and comfortable fit with socks alone
For the right patient, the Overlay can help create a more stable and comfortable experience without relying exclusively on stacking sock ply throughout the day.
Designed for Both Transtibial and Transfemoral Amputees
Ethnocare offers two versions of the technology:
Overlay TT
Designed for the transtibial amputee, Overlay TT supports volume management for below-knee prosthetic users who need improved fit, comfort, and suspension throughout the day.
Overlay TF
Designed for the transfemoral amputee, Overlay TF addresses the unique fit and stability challenges faced by above-knee prosthetic users, where socket control and consistent contact are especially important.
By offering both TT and TF options, Ethnocare helps clinics address limb volume variation across a wider range of patient needs in lower limb prosthetics.
Why This Moment Matters for Clinicians
The new CMS fee schedule brings greater clarity to reimbursement for clinics looking to provide advanced limb volume management solutions.
This matters because reimbursement clarity can play an important role in supporting clinical adoption and helping more patients access technologies specifically designed to improve socket fit, comfort, and stability.
At Ethnocare, we believe innovation only matters if patients and clinicians can use it in real practice. The recognition of Overlay under HCPCS code L5657 is an important step toward making limb volume management a more visible and better supported part of prosthetic care.
Why This Moment Matters for the Future of Limb Volume Management
This milestone is about more than reimbursement.
It reflects growing recognition that limb volume variation is a real and meaningful issue in prosthetic care, and that patients deserve solutions specifically designed to address it.
For too long, many clinics have had limited options beyond traditional prosthetic socks and workarounds. The dedicated recognition of the Overlay through HCPCS code L5657 is an important step toward expanding the tools available to clinicians treating both the transtibial amputee and transfemoral amputee population.
Conclusion
The addition of HCPCS code L5657 and the new 2026 CMS fee schedule marks an important milestone for Ethnocare and for the future of limb volume management in lower limb prosthetics.
It reflects growing recognition of the real clinical challenges caused by residual limb volume variation and the need for dedicated solutions that go beyond traditional prosthetic socks. For both the transtibial amputee and the transfemoral amputee, better volume management can mean better fit, better stability, and greater day-to-day confidence with a prosthesis.
At Ethnocare, we are proud to see the Overlay recognized as a distinct solution in this space, and we remain committed to supporting clinicians with technologies designed to improve comfort, function, and patient outcomes.
