L5580 Preparatory Above-Knee Socket | HCPCS Reimbursement | OpenPayer

Summary & Overview

HCPCS L5580: Preparatory Above-Knee Knee Disarticulation Socket

HCPCS Level II code L5580 designates a preparatory, above-knee prosthetic socket for knee disarticulation or ischial-level amputations. The code covers a non-alignable system constructed of thermoplastic or equivalent, including a pylon and SACH foot, molded to a model and supplied without an external cover. This preparatory device is used for initial fitting, gait training, and early prosthetic use, making it a critical step in post-amputation rehabilitation and mobility restoration.

Key national payers in scope include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. The publication provides a concise overview of coverage context across major payers and highlights the clinical role of the device.

Readers will learn the clinical intent and typical site-of-service for L5580, common billing and documentation considerations, and where to find payer-specific coverage information. The report also summarizes typical service components—fabrication, molding to model, and inclusion of a pylon and SACH foot—and outlines what information is and is not available in the input data. Data not available in the input includes associated taxonomies, specific ICD-10 diagnoses, detailed payer policy language, and related codes.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicareL5580HCPCS Level IIprostheticsabove-knee amputationpreparatory socketorthotics and prostheticsSACH footpylon

Billing Code Overview

HCPCS Level II code L5580 describes a preparatory, above knee - knee disarticulation ischial level socket, non-alignable system, with pylon, no cover, SACH foot, made of thermoplastic or equivalent and molded to a model. This prosthetic item is intended for an above-knee amputee at the knee disarticulation or ischial level and represents a preparatory socket system designed for initial fitting and gait training.

Service Type: Prosthetic device fabrication and fitting (preparatory socket system)

Typical Site of Service: Prosthetics clinic or outpatient orthotics and prosthetics (O&P) facility, where molding, fitting, and initial prosthetic training occur.

Clinical & Coding Specifications

Clinical Context

A 62-year-old male with peripheral arterial disease and chronic non-healing ulceration of the distal thigh undergoes a surgical above-knee amputation (through the distal femur or knee disarticulation). Postoperatively, once the residual limb has stabilized and swelling has reduced, the patient is evaluated by a prosthetist for a preparatory ischial-level socket (above knee / knee disarticulation) fabricated from thermoplastic material, with a non-alignable system, pylon and SACH foot. The workflow includes: pre-prosthetic assessment (residual-limb shape, skin integrity, range of motion, contracture risk), casting or digital scanning to create a model, molding of a thermoplastic socket to the model, attachment of a pylon and SACH foot for a preparatory (temporary) prosthesis, fitting session, alignment checks, and education on donning/doffing and skin care. Typical site of service is an outpatient prosthetics clinic or specialized orthotics and prosthetics (O&P) facility; initial fabrication may occur in an ambulatory surgery center if concurrent revision occurs. Common payors in review include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, BUCA, and Medicare.

Coding Specifications

Modifier	Description	When to Use
`52`	Reduced services	Use when a component of the prosthetic service was partially furnished or a planned component was omitted, resulting in reduced work or materials.

HCPCS L5585: Preparatory Above-Knee/Ischial-Level Prosthetic Socket

HCPCS-L5644-ADDITION-LOWER-EXTREMITY-ABOVE-KNEE-WOOD-SOCKET

HCPCS L5644: Addition to Lower Extremity, Above-Knee, Wood Socket

HCPCS-L5643-HIP-DISARTICULATION-FLEXIBLE-INNER-SOCKET-EXTERNAL-FRAME

HCPCS L5643: Addition to Lower Extremity Prosthesis, Hip Disarticulation

HCPCS-L8679-IMPLANTABLE-NEUROSTIMULATOR-PULSE-GENERATOR

HCPCS L8679: Implantable Neurostimulator Pulse Generator

HCPCS-L5638-LOWER-EXTREMITY-BELOW-KNEE-LEATHER-SOCKET-ADDITION

HCPCS L5638: Addition to Lower Extremity, Below Knee, Leather Socket

HCPCS-L6638-UPPER-EXTREMITY-ELECTRIC-LOCKING-PROSTHESIS-ADDITION

HCPCS L6638: Upper Extremity Prosthesis Addition, Electric Locking Feature

HCPCS-L5964-ENDOSKELETAL-ABOVE-KNEE-FLEXIBLE-COVERING

HCPCS L5964: Endoskeletal Above-Knee Flexible Protective Outer Covering

HCPCS-L6000-PARTIAL-HAND-THUMB-REMAINING-PROSTHESIS

HCPCS L6000: Partial Hand Prosthesis, Thumb Remaining

HCPCS-L5795-EXOSKELETAL-HIP-DISARTICULATION-ULTRA-LIGHT-ADDITION

HCPCS L5795: Exoskeletal Hip‑Disarticulation Prosthetic Addition, Ultra‑Light Material

HCPCS-L6588-SHOULDER-DISARTICULATION-PREPARATORY-PLASTIC-SOCKET

HCPCS L6588: Preparatory Shoulder Disarticulation Plastic Socket

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Taxonomy Code	Specialty	Notes
`221K00000X`	Orthotics & Prosthetics	Prosthetists who fabricate and fit the socket and prosthetic components.
`2080P0227X`	Physical Medicine & Rehabilitation	Physiatrists who manage pre- and post-amputation rehabilitation and prosthetic prescription.
`207L00000X`	Orthopedic Surgery	Orthopedic surgeons who perform the amputation and coordinate limb reconstruction and prosthetic referral.
`208800000X`	Physical Therapist	Physical therapists who perform gait training and functional assessment post-fitting.
`364S00000X`	Vascular Surgery	Vascular surgeons who treat arterial disease leading to amputation and coordinate limb preservation.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`Z89.611`	Acquired absence of right leg above knee	Indicates the patient has an above-knee amputation on the right side and is eligible for an above-knee preparatory prosthesis.
`Z89.612`	Acquired absence of left leg above knee	Indicates the patient has an above-knee amputation on the left side and is eligible for an above-knee preparatory prosthesis.
`Z89.619`	Acquired absence of unspecified leg above knee	Used when laterality is not specified for an above-knee amputation.
`I70.213`	Atherosclerosis of native arteries of extremities with rest pain, right leg	Represents peripheral arterial disease that may lead to amputation and prosthetic need.
`I70.214`	Atherosclerosis of native arteries of extremities with rest pain, left leg	Same as above for left lower extremity.
`L97.411`	Non-pressure chronic ulcer of right lower leg with necrosis of muscle	Chronic non-healing ulceration/necrosis is a common indication leading to amputation and subsequent prosthetic fitting.
`T79.A11`	Traumatic amputation of right lower leg, initial encounter	Traumatic causes of limb loss requiring prosthetic fitting; relevant when the amputation was traumatic rather than vascular.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`97760`	Orthotic management and training, initial encounter; fitting and training with temporary prosthesis	Used for initial training and education when a preparatory prosthesis (thermoplastic socket with pylon and SACH foot) is provided.
`97763`	Orthotic management and training, subsequent encounter	Used for follow-up training and adjustments after initial prosthetic fitting.
`97761`	Prosthetic training, initial encounter (includes gait training)	Applied when structured prosthetic gait training is provided following fitting of the preparatory prosthesis.
`99070`	Supplies and materials provided by the physician over and above those usually included with the service	Used for billing certain expendable items or special materials used in the fabrication not included in the base prosthetic allowance.
`L4360`	Prosthetic knee joint, single axis hydraulic or pneumatic (example adjunct)	May be billed when a more advanced knee unit is provided later in the prosthetic progression (not for the basic non-alignable preparatory system but relevant in the care pathway).

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