Summary & Overview
HCPCS L5150: Knee Disarticulation Prosthesis with Molded Socket and SACH Foot
HCPCS Level II code L5150 denotes a complete knee-disarticulation prosthetic assembly: a molded socket with external knee joints, a shin component, and a SACH (solid-ankle cushioned-heel) foot. This code is important nationally because it identifies a distinct prosthetic solution for patients with through-knee amputations, with implications for durable medical equipment coverage, clinical fitting workflows, and prosthetist service lines.
Key payers commonly referenced for coverage and reimbursement patterns include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of clinical context for knee-disarticulation prostheses, typical sites of service for fitting and follow-up, and common billing considerations. The publication summarizes benchmarks where available, highlights relevant policy and documentation requirements that affect claim adjudication, and clarifies billing scope tied to the integrated components described by the code.
This analysis aids prosthetists, billing specialists, and policy professionals in understanding how L5150 is used in practice, what to expect from major payers, and where additional documentation or coding specificity is often required. Data not available in the input will be identified where applicable in detailed sections.
Billing Code Overview
HCPCS Level II code L5150 describes a knee disarticulation (through-knee) prosthetic socket assembly that includes a molded socket, external knee joints, shin, and SACH foot. This item represents a definitive lower-extremity prosthesis designed for patients who have undergone knee disarticulation and require an integrated socket and suspension with mechanical knee components and a solid-ankle cushioned-heel (SACH) foot.
Service Type: Prosthetic lower-extremity device (knee-disarticulation prosthesis)
Typical Site of Service: Prosthetics/orthotics clinic, outpatient prosthetic fitting center, or durable medical equipment supplier
Clinical & Coding Specifications
Clinical Context
A 62-year-old male with dysvascular disease and chronic nonhealing foot/ankle infections undergoes a transtibial limb salvage attempt that ultimately is not viable; the surgical team performs a knee disarticulation (through-knee amputation). Postoperative management includes application and shaping of a custom molded prosthetic socket with external knee joints, a posterior shin component, and a SACH foot to permit early weight-bearing and rehabilitation. The typical clinical workflow: pre-prosthetic surgical healing and residual-limb measurement by prosthetist; casting or scanning for a custom molded socket; fabrication of external knee joints and attachment hardware; iterative fitting appointments with alignment adjustments and gait training; follow-up visits for pressure-relief modifications and component replacement as needed.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
00 | No modifier information | Rarely used; default when no modifier applies |
11 | Office or outpatient visit | When billed for evaluation/management component related to prosthetic fitting in office |