HCPCS Code L5981: All Lower Extremity Prostheses, Flex-Walk System or Equal

The Flex-Walk or similar prosthesis under HCPCS Code L5981 is designed to provide comfort, stability, and energy return for individuals with higher activity levels (K3–K4), helping individuals regain mobility and independence. This advanced equipment supports smoother gait mechanics and improves quality of movement, which can be especially beneficial during rehabilitation and long-term prosthetic use.

Providers must document the patient’s clinical assessment, including functional level, activity goals, and medical necessity. Thorough notes should show how the device offers specific benefits such as improved stance control and range of motion. Following CMS and Medicare guidelines helps ensure correct billing and timely payment.

A Flex-Walk-type prosthesis is specifically designed for individuals who are active and motivated to return to daily life activities. Patients who require support on uneven surfaces or those seeking better gait efficiency often see significant improvements with proper evaluation, fitting, and adjustments.