Summary & Overview
HCPCS L5500: Initial Below-Knee PTB Socket with SACH Foot
HCPCS Level II code L5500 identifies an initial, below-knee patellar-tendon-bearing (PTB) type socket prosthesis assembled as a non-alignable system with a pylon, no cover, a SACH foot, plaster socket, and direct-formed fabrication. This code captures a common baseline lower-limb prosthetic configuration used after transtibial amputation or limb loss and matters nationally because it represents a core prosthetic supply and service line with implications for supplier billing, coverage policies, and durable medical equipment benefit management.
Key payers addressed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of clinical and billing context for L5500, typical sites of service, and the kinds of components encapsulated by the code. The publication summarizes national reimbursement and coverage themes, common billing modifiers and administrative notes (where available), and how this code is positioned relative to related prosthetic device codes.
The content is intended to help providers, billing professionals, and policy analysts understand what L5500 represents, where it is used clinically, and what payer coverage considerations typically accompany an initial below-knee PTB socket prosthesis. Data not available in the input include payer-specific rates, associated taxonomies, ICD-10 diagnosis pairings, and related codes.
Billing Code Overview
HCPCS Level II code L5500 describes an initial, below knee patellar-tendon-bearing (PTB) type socket for a lower-limb prosthesis. The full description specifies a non-alignable system with a pylon, no cover, a SACH foot, a plaster socket, and direct formed fabrication. This code represents the initial prosthetic socket and basic structural components used to create a below-knee prosthesis for an individual requiring a transtibial (below-knee) limb replacement.
Service type: Prosthetic device fabrication and fitting
Typical site of service: Orthotics & prosthetics clinic or prosthetist facility, with possible fabrication work occurring in a prosthetics laboratory.
Clinical & Coding Specifications
Clinical Context
A 58-year-old male patient presents after a transtibial (below-knee) amputation performed for non-healing diabetic foot infection. The residual limb has healed and is appropriately shaped for prosthetic fitting. The patient is scheduled for an initial, non-alignable patellar-tendon-bearing (PTB) type socket prosthesis constructed by direct plaster forming with a pylon and SACH foot (no cosmetic cover). The clinical workflow includes: pre-prosthetic evaluation by a prosthetist and physician; limb shaping and cast taking (plaster) in the prosthetic clinic; fabrication of a PTB socket as a non-alignable system; assembly with a pylon and SACH foot; fitting and alignment check; initial functional training and gait assessment provided by a physical therapist; and follow-up visits for adjustments. Typical site of service is an outpatient prosthetics clinic or orthotics/prosthetics facility. The typical patient scenario involves post-amputation rehabilitation for mobility restoration and activities of daily living improvement, with coordination between the prosthetist, referring physician (physiatrist or orthopedic surgeon), and physical therapy services.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
00 | Unspecified | Rarely used; not recommended when a specific modifier applies |
11 |