Summary & Overview
HCPCS L5858: Lower Extremity Prosthesis, Microprocessor Stance-Phase Knee-Shin
HCPCS Level II code L5858 identifies an add-on component for lower extremity prostheses: an endoskeletal knee-shin system with a microprocessor control feature that functions during the stance phase and includes electronic sensors. This code is important nationally because microprocessor-controlled prosthetic features can affect mobility, safety, and device costs for patients with lower-limb amputations and are commonly reviewed by payers for medical necessity and configuration details.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. The publication outlines how these payers address coverage for microprocessor stance-phase enhancements, typical billing practices, and where this code fits within prosthetics service lines.
Readers will learn the clinical context for L5858 (what the component does and typical care settings), how this HCPCS Level II code is used operationally on claims, and which stakeholders are involved in prior authorization and coverage review. The report also summarizes available benchmarks and policy-related considerations relevant to device classification and reimbursement pathways. Data not included in the input—such as specific payer rates, associated ICD-10 diagnoses, and taxonomies—are noted as not available in the input.
Billing Code Overview
HCPCS Level II code L5858 describes an addition to a lower extremity prosthesis: an endoskeletal knee-shin system with a microprocessor control feature that provides stance phase only functionality and includes electronic sensor(s) of any type.
Service type: Prosthetic component — microprocessor-controlled stance-phase knee-shin addition
Typical site of service: Prosthetics and orthotics supplier facility, outpatient prosthetics clinic, or inpatient rehabilitation setting
Data not available in the input.
Clinical & Coding Specifications
Clinical Context
A 62-year-old transtibial amputee with a history of peripheral arterial disease and prior infection presents for prosthetic upgrade due to recurrent instability and excessive knee flexion during stance on uneven surfaces. The prosthetist and orthopedic surgeon evaluate the patient in the prosthetic clinic. Gait analysis shows prolonged stance-phase collapse and poor weight-bearing symmetry. The care team selects an endoskeletal lower extremity prosthetic knee-shin system with a microprocessor-controlled stance-phase feature to improve stance stability. The workflow includes pre-prosthetic assessment, measurement and casting (or digital scanning), component ordering (including the L5858 microprocessor stance-phase add-on), fitting and alignment, in-clinic programming and sensor calibration, iterative gait training with a physical therapist, and follow-up adjustments. Typical site of service is an outpatient prosthetics clinic or multidisciplinary rehabilitation clinic; initial fittings or troubleshooting may occur in an inpatient rehabilitation setting following amputation surgery or medical hospitalization.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
11 | Primary procedure | When L5858 is the primary billed prosthetic addition on the claim for that date of service |