Summary & Overview
HCPCS L5505: Initial Above-Knee/Ischial-Level Prosthetic System
HCPCS Level II code L5505 denotes an initial prosthetic system for above-knee amputations at the knee-disarticulation or ischial level, comprising a non-alignable socket with pylon, no cover, a SACH foot, and a direct-formed plaster socket. This code matters nationally because it captures initial fabrication and fitting services for a complex lower-limb prosthesis used in mobility restoration after high-level lower-extremity amputation. Proper coding affects coverage determinations, prior authorization, and payment for a multidisciplinary service involving prosthetists, orthotists, and rehabilitation teams.
Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise explanation of the code’s clinical and device components, expected sites of service, and the payer landscape relevant to coverage and claims processing. The publication outlines typical benchmarks and considerations for initial prosthetic devices, summarizes common modifiers used with prosthetic claims, and clarifies where data was not provided.
This national overview is intended for billing managers, prosthetic clinicians, and policy analysts seeking a clear reference to HCPCS Level II code L5505, its clinical context, and the payer environment that governs reimbursement and authorization practices.
Billing Code Overview
HCPCS Level II code L5505 describes an initial prosthetic socket and component system for an above-knee through knee disarticulation or ischial-level amputation. The full description indicates an initial, above knee - knee disarticulation, ischial level socket, non-alignable system, pylon, no cover, sach foot, plaster socket, direct formed.
Service type: Prosthetic limb fabrication and fitting (initial above-knee/is chial-level prosthesis)
Typical site of service: Prosthetics/orthotics clinic, outpatient specialty clinic, or hospital prosthetics fitting unit
Data not available in the input for associated taxonomies, ICD-10 diagnoses, and related codes.
Clinical & Coding Specifications
Clinical Context
A 62-year-old male with peripheral arterial disease and chronic non-healing ischemic ulcer of the distal thigh undergoes a transfemoral (above-knee) amputation at the knee disarticulation level. After surgical healing and stable residual limb volume, the patient is referred to a prosthetist for fabrication of an initial ischial-level socket prosthesis described by billing code L5505 (initial, above knee - knee disarticulation, ischial level socket, non-alignable system, pylon, no cover, sach foot, plaster socket, direct formed). Typical clinical workflow includes a prosthetic evaluation visit (gait and mobility assessment, residual limb exam, and measurements), casting or scanning of the residual limb, casting modification and check-socket try-in (if applicable), final fabrication using a plaster direct-formed socket with pylon and SACH foot, delivery and alignment session, patient education on donning/doffing and skin care, and scheduled follow-up visits for fit and function adjustments. Common care team members include the prosthetist, physical therapist for gait training, the referring surgeon (orthopedic or vascular surgeon), and primary care for medical optimization. Typical site of service is an outpatient prosthetics clinic or orthotics and prosthetics facility; initial surgical and immediate post-operative care occurs in an inpatient or ambulatory surgical center depending on the amputation setting.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
11 |