Summary & Overview
HCPCS L5634: Lower Extremity Symes-Type Posterior Opening (Canadian) Socket
HCPCS Level II code L5634 denotes an addition to a lower-extremity Symes-type prosthetic socket with a posterior opening and Canadian-style design. This component is used in prosthetic care for patients with ankle disarticulation and is significant for prosthetic fitting, mobility restoration, and durable medical equipment management across care settings. Nationally, precise coding for specialized socket components affects patient access to appropriate prosthetic devices and influences billing consistency for suppliers and payers.
Key payers in this context include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of the clinical purpose of the component, typical sites of service, common modifiers provided in the input, and the payer landscape covered. The publication outlines benchmarks and billing considerations, highlights clinical context for Symes-level amputations and Canadian socket design, and notes where input data is not available for specific taxonomies, ICD-10 pairings, or related codes. This material is intended to support billing professionals, prosthetists, and policy analysts seeking a national summary of L5634 for coding and administrative reference.
Billing Code Overview
HCPCS Level II code L5634 describes an addition to a lower extremity symes-type posterior opening (Canadian) socket. This code represents a prosthetic socket component designed for patients with a Symes (ankle disarticulation) amputation, incorporating a posterior opening and a Canadian-style socket design.
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Service type: Prosthetic component fabrication and/or fitting for lower extremity limb loss
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Typical site of service: Prosthetics clinic, orthotics and prosthetics facility, or specialized rehabilitation center
Clinical & Coding Specifications
Clinical Context
A 54-year-old patient with a transtibial amputation at the Symes level (ankle disarticulation) presents to a prosthetics clinic for fabrication of a posterior-opening Canadian-style socket addition to an existing lower-extremity prosthesis. The patient reports socket discomfort and instability with the current prosthetic interface after recent weight changes and residual limb volume fluctuations. The certified prosthetist performs a clinical evaluation, measures the residual limb, documents limb shape, skin integrity, and gait observations, and determines that a custom addition to the existing Symes-type posterior-opening socket is required to improve suspension and load distribution.
The clinical workflow includes: an initial prosthetic consultation, detailed limb and prosthesis assessment, fabrication planning and measurements, ordering of L5634 as an addition to the existing lower-extremity Symes posterior-opening (Canadian) socket, fabrication in the prosthetics lab, a fitting visit for alignment and interface adjustments, and at least one follow-up visit for fine-tuning fit and function. Documentation includes the medical necessity rationale, measurements, materials used, provider signature, and any applicable modifier(s) for billing.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
LT | Left side | Use when the addition is for the left lower extremity Symes socket |