Summary & Overview
HCPCS L1844: Custom-Fabricated Knee Orthosis, Single Upright
HCPCS Level II code L1844 denotes a custom-fabricated knee orthosis: a single-upright thigh-and-calf brace with adjustable flexion/extension joint and medial-lateral/rotation control, optionally including varus/valgus adjustment. This durable medical equipment code matters nationally because it captures services for advanced, individualized knee stabilization used in post-operative care, ligament instability, or severe degenerative conditions that require precise motion control. Payers commonly involved in coverage and claims for L1844 include Aetna, Blue Cross Blue Shield, Cigna, UnitedHealthcare, and Medicare.
Readers will find an overview of clinical indications and the device’s role in care pathways, guidance on typical sites of service and service line classification, and a summary of common modifiers and administrative considerations. The publication also outlines benchmarking and policy context where available and notes when input data is unavailable. The goal is to inform clinical administrators, orthotics suppliers, and coding professionals about the code’s definition, operational context, and payer landscape at a national level.
Billing Code Overview
HCPCS Level II code L1844 describes a knee orthosis, single upright, thigh and calf, with adjustable flexion and extension joint (unicentric or polycentric), medial-lateral and rotation control, with or without varus/valgus adjustment, custom fabricated. This device is a custom-fabricated knee brace designed to provide substantial knee joint stabilization and controlled range of motion for patients requiring targeted mechanical support.
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Service type: Durable medical equipment (custom-fabricated lower-extremity orthosis)
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Typical site of service: Outpatient orthotic/prosthetic clinic, specialty orthopedics practice, or other ambulatory care settings where custom braces are fabricated and fitted
Clinical & Coding Specifications
Clinical Context
A 62-year-old patient with medial compartment osteoarthritis and varus knee alignment is evaluated in an outpatient orthotics clinic following conservative management with physical therapy and medications. The orthotist performs a measured evaluation, documents knee instability and functional limitations, and prescribes a custom-fabricated single upright knee orthosis with adjustable flexion/extension joint and medial-lateral/rotation control to unload the affected compartment and improve stability during ambulation. The workflow includes: patient evaluation and measurement, selection of L1844 as the device, fabrication based on custom casts or digital measurements, fitting and adjustments at delivery, patient education on donning/doffing and joint lock settings, and scheduled follow-up visits for reassessment.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
LT | Left side | When the orthosis is furnished for the left knee |
RT | Right side | When the orthosis is furnished for the right knee |