Summary & Overview
HCPCS L5585: Preparatory Above-Knee/Ischial-Level Prosthetic Socket
HCPCS Level II code L5585 designates a preparatory, prefabricated adjustable open-end socket prosthesis for above-knee, knee disarticulation, and ischial-level amputations. The device is a non-alignable system with a pylon and SACH foot supplied without a cover, intended for interim use during rehabilitation and initial prosthetic fitting. Nationally, this code matters because preparatory prosthetic options influence access to mobility aids during recovery and can affect short-term outcomes and initial cost trajectories for lower-limb amputees. Key payers addressed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will learn the clinical scope of the code, typical sites of service, and payer coverage context. The publication summarizes reimbursement benchmarks, common billing and documentation considerations, and where policy updates intersect with prosthetic supply and temporary device coverage. It also provides clinical context on when a preparatory, non-alignable device with a SACH foot and pylon is used versus definitive prostheses, and outlines common administrative issues that influence claims processing and authorization.
Billing Code Overview
HCPCS Level II code L5585 describes a prefabricated, adjustable open-end socket prosthetic for above-knee through knee-disarticulation and ischial-level amputations. The item includes a non-alignable system with a pylon and a SACH foot, and is supplied without a cosmetic cover. This device is intended as a preparatory prosthesis to support ambulation during rehabilitation and interim fitting phases.
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Service type: Prosthetic device — preparatory above-knee/ischial-level socket with pylon and SACH foot
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Typical site of service: Prosthetic and orthotic provider clinics, outpatient rehabilitation facilities, and home use following fitting
Clinical & Coding Specifications
Clinical Context
A 58-year-old male with a history of peripheral arterial disease and a non-healing infected above-knee stump following traumatic amputation presents for fabrication of a preparatory, above-knee prosthetic socket. The prescription is for a prefabricated adjustable open-end socket configured for an ischial-level suspension (knee disarticulation to ischial level), using a non-alignable pylon and a SACH foot. The clinical workflow includes: initial prosthetic evaluation and measurement by a certified prosthetist; wound and skin assessment documented by the treating physician; limb shaping and cast or scan for socket fit; assembly of the prefabricated adjustable socket, pylon, and SACH foot; initial fitting and alignment session; gait training and progressive adjustments; and follow-up visits for socket modifications and wound monitoring. Typical site of service is an outpatient prosthetics clinic or a hospital outpatient prosthetics department. The typical patient scenario involves functional mobility goals such as household or community ambulation, pain control, and prevention of further skin breakdown during prosthetic use.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
00 | Standard - no modifier | Use when no special modifier applies to the service. |
11 |