L5811 Endoskeletal Knee-Shin — HCPCS Reimbursement | OpenPayer

Summary & Overview

HCPCS L5811: Endoskeletal Knee-Shin Single-Axis Manual-Lock, Ultra-Light

HCPCS Level II code L5811 denotes an addition to an endoskeletal knee-shin orthotic system: a single-axis, manual-lock knee joint manufactured from ultra-light materials. This component is used to provide mechanical knee stability for patients requiring a modular orthosis. Nationally, orthotic component coding affects durable medical equipment billing, medical necessity review, and device classification for suppliers and payers.

Key payers discussed include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of code purpose and clinical context, payer coverage considerations, common modifiers and claim handling practices, and typical sites of service where L5811 is billed. The publication summarizes benchmarking and reimbursement themes relevant to durable medical equipment suppliers and orthotics providers, highlights documentation elements tied to medical necessity for a knee-shin addition, and outlines where to find applicable policy language.

This summary targets billing managers, orthotics and prosthetics clinicians, revenue cycle staff, and policy analysts seeking a national view of how an endoskeletal knee-shin single-axis manual lock component is coded and processed in typical outpatient and supplier settings.

AetnaBlue Cross Blue ShieldCigna HealthUnitedHealthcareMedicareL5811HCPCS Level IIorthoticsknee-shindurable medical equipmentmanual locksingle-axis jointDME billing

Billing Code Overview

HCPCS Level II code L5811 describes an addition for an endoskeletal knee-shin orthotic system featuring a single-axis joint with a manual lock constructed from ultra-light material. This code represents a component added to a modular lower-limb orthosis to provide knee stability through a manually engaged lock mechanism.

Service Type: Durable Medical Equipment — lower extremity orthotic component

Typical Site of Service: Outpatient orthotics/prosthetics clinic, specialty prosthetics providers, or durable medical equipment suppliers

Clinical & Coding Specifications

Clinical Context

A 52-year-old ambulatory patient with a transtibial amputation presents to a prosthetics clinic for fabrication and fitting of a definitive endoskeletal prosthesis. The plan includes addition of a single-axis, manual-lock knee-shin system made of ultra-light material (L5811) to the existing endoskeletal system to improve knee stability during stance for limited community ambulation. The clinical workflow includes: pre-fitting evaluation by a certified prosthetist and prosthetic assistant, gait and functional assessment, socket alignment review, measurement and ordering of the L5811 component, documentation of functional level (K-level), delivery and alignment session, in-clinic training for engaging/disengaging the manual lock, and follow-up visits for adjustments and durability checks. Typical site of service is an outpatient prosthetics clinic or orthotics and prosthetics practice. Supplies are often fabricated in a prosthetic lab; adjustments may occur on-site. Insurance authorizations are obtained prior to delivery when required, and claims include the product code L5811 with appropriate modifier(s) and supporting clinical documentation of amputation level and functional limitations.

Coding Specifications

Modifier	Description	When to Use
`00`

HCPCS L5705: Custom Shaped Protective Cover, Above Knee

HCPCS-L5535-PREPARATORY-BELOW-KNEE-PTB-SOCKET-PREFABRICATED

HCPCS L5535: Preparatory Below-Knee PTB Socket, Prefabricated

HCPCS-L5782-LOWER-LIMB-PROSTHESIS-VACUUM-VOLUME-MANAGEMENT-MOISTURE-EVACUATION

HCPCS L5782: Lower Limb Prosthesis Vacuum Pump for Residual Limb Management

HCPCS-L8684-SACRAL-NEUROSTIMULATOR-TRANSMITTER-REPLACEMENT

HCPCS L8684: External Radiofrequency Transmitter for Sacral Neurostimulator Replacement

HCPCS-L6882-UPPER-LIMB-MICROPROCESSOR-CONTROL-FEATURE

HCPCS L6882: Microprocessor Control Feature for Upper Limb Prosthetic Terminal Device

HCPCS-L7510-PROSTHETIC-REPAIR-MINOR-PARTS

HCPCS L7510: Repair of Prosthetic Device, Minor Parts

HCPCS-L5430-INITIAL-RIGID-DRESSING-AK-KNEE-DISARTICULATION

HCPCS L5430: Initial Rigid Dressing for AK or Knee Disarticulation

HCPCS-L6205-ELBOW-DISARTICULATION-MOLDED-SOCKET-EXPANDABLE-INTERFACE

HCPCS L6205: Elbow Disarticulation Molded Socket with Expandable Interface

HCPCS-L7260-ELECTRONIC-WRIST-ROTATOR

HCPCS L7260: Electronic Wrist Rotator (Otto Bock or Equal)

HCPCS-L6670-UPPER-EXTREMITY-HOOK-TO-HAND-CABLE-ADAPTER

HCPCS L6670: Upper Extremity Hook-to-Hand Cable Adapter

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Taxonomy Code	Specialty	Notes
`254E00000X`	Prosthetist/Orthotist	Primary provider responsible for device selection, fabrication, fitting, and adjustments.
`207L00000X`	Orthopedic Surgery	Surgeon involved when residual limb revision or surgical procedures are part of the prosthetic management.
`103T00000X`	Physical Medicine & Rehabilitation (Physiatry)	Provides functional assessment, K-level determination, and rehabilitation oversight.
`225100000X`	Physical Therapist	Performs gait training and functional mobility assessment during fitting and follow-up.
`332B00000X`	Durable Medical Equipment Supplier	Entity responsible for dispensing and billing prosthetic components when not performed by a prosthetist.

Related Diagnoses

ICD-10 Code	Description	Clinical Relevance
`Z89.611`	Acquired absence of right leg above knee	Indicates a transtibial or transfemoral amputation status relevant to prosthetic knee-shin system selection and justification.
`Z89.612`	Acquired absence of left leg above knee	Indicates contralateral limb amputation status when fitting prosthetic components.
`Z89.619`	Acquired absence of unspecified leg above knee	Used when laterality is unspecified in historical documentation.
`M21.671`	Contracture, right ankle	Joint contractures that affect alignment, socket fit, and component selection for stability.
`M21.672`	Contracture, left ankle	As above for the left side; impacts fitting and functional training.
`M62.81`	Muscle weakness (generalized)	Functional weakness that supports need for a manual-lock knee for additional stance stability.
`G82.20`	Paraplegia, unspecified	Neurologic impairment affecting ambulation and contributing to prosthetic component decision-making.
`R26.2`	Difficulty in walking, not elsewhere classified	Symptom code supporting need for prosthetic adjustments or upgrade to a more stable knee system.

Related CPT Codes

CPT Code	Description	Relationship to This Procedure
`97760`	Orthotic(s) management and training, upper extremity(s), lower extremity(s) and/or trunk, initial orthotic fit and training; one piece device	Used for initial training and fitting sessions when adding or adjusting a prosthetic knee-shin system; documents patient instruction and functional training.
`97763`	Orthotic(s)/prosthetic(s) follow-up management, established patient, subsequent orthotic/prosthetic supply, and training	Used for routine follow-up visits for adjustments, alignment checks, and patient training after delivery of the `L5811` component.
`S8423`	Replacement prosthesis lower extremity; endoskeletal shank/ankle assembly (non-payor specific HCPCS S-code)	May be used by some payors for components related to endoskeletal assemblies when reporting additional modular components (payor-specific).
`A9270`	Non-covered item or service	Used by some insurers to identify items not covered under the beneficiary's plan when necessary (payor-specific reporting).
`99070`	Supplies and materials (medical), noncovered, unless otherwise listed, non-durable medical supplies	Used to report additional supplies, alignment aids, or materials used during fitting not separately billable under the HCPCS product code.

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