We are proud to announce that the Ethnocare Overlay has been assigned a new HCPCS code in the United States: L-5657. This milestone represents an important step forward for prosthetic volume-management solutions and, most importantly, for patient access.
HCPCS Code L-5657 Effective October 1
L-5657 Descriptor
“Addition to lower extremity prosthesis, manual or automated adjustable air, fluid, gel, or equivalent socket insert for limb volume management, any materials.”
The L-5657 code became effective October 1, formally recognizing adjustable socket inserts as a distinct prosthetic category. This designation reflects growing clinical adoption and the need for solutions that address residual limb volume fluctuations in a more dynamic, patient-centered way.
CMS Recognition of the Overlay as the Predicate Product
During the coding process, CMS recognized the Ethnocare Overlay as the predicate product for this new code. CMS also acknowledged that adjustable socket inserts represent a distinct product category with unique therapeutic advantages, separate from traditional volume-management methods such as prosthetic socks.
Among the recognized benefits are:
- Real-time adjustability without removing the prosthesis
- Targeted volume accommodation, addressing localized voids rather than uniformly adding bulk
- Improved suspension and stability, supporting safer ambulation
- Enhanced comfort and limb health, reducing pressure points and skin irritation
- Extended socket lifespan, delaying the need for socket replacement
- Reduced number of follow-up appointments due to fitting issues or adjustment
These features directly respond to well-documented clinical challenges associated with daily and long-term residual limb volume changes.
Clinical Evidence Supporting the Overlay
The Overlay’s clinical value is supported by peer-reviewed research and real-world outcomes.
An independent study published in Sensors (2024) demonstrated that the Overlay can improve comfort, stability, and functional performance compared to prosthetic socks, while reducing pain and compensatory movement strategies.
Read the full study here:
https://pmc.ncbi.nlm.nih.gov/articles/PMC11281076/
In addition, a multi-patient case study evaluating the Overlay in clinical use showed improvements in socket fit, cushioning, ease of use, and overall patient satisfaction when compared to traditional sock management.
Read the case study here:
Together, these data reinforce the Overlay’s role as a clinically meaningful solution for transtibial and transfemoral patients.
Billing and Reimbursement Resources
To support clinicians, billing teams, and payers, Ethnocare has made detailed reimbursement resources available on its website, including:
- A Reimbursement Guide specific to HCPCS L5657: https://hubs.ly/Q03Ywtrx0
- An MSRP document to support transparent billing discussions: https://hubs.ly/Q03YwvlZ0
These materials are designed to simplify claims submission and support consistent coverage decisions across Medicare and commercial insurers.
Strong Support from the O&P Community
The establishment of L-5657 would not have been possible without the strong support of the O&P community. Certified prosthetists across the United States provided clinical insight, utilization data, and letters of support highlighting the Overlay’s impact on patient care and system efficiency.
As one U.S. Certified Prosthetist shared:
“For this patient we were able to take advantage of the ability to retrofit the Ethnocare Overlay into the current socket, and treat this as an adjustable style socket. This has worked very well, and did not require us to fabricate a new socket. This reduced time spent in our office for the patient, and decreased payment for new sockets for his insurance company. Overall, the Overlay has improved his life and socket fit.”
Positive Impact for Medicare and Beyond
The new L-5657 code is expected to significantly improve access for Medicare beneficiaries, while also supporting coverage decisions among Medicaid programs and commercial insurers. By recognizing adjustable socket inserts as their own category, L-5657 enables clinicians to prescribe the most appropriate solution earlier, often preventing downstream complications, unnecessary appointments, and premature socket replacement.
We are grateful for the collaboration and trust of clinicians, researchers, and patients who contributed to this achievement. L-5657 represents more than a code, it reflects progress toward smarter, more responsive prosthetic care.
For additional billing information and clinical resources, visit www.ethnocare.com.
