Summary & Overview
HCPCS L1940: Ankle-Foot Orthosis, Custom-Fabricated
HCPCS Level II code L1940 designates a custom-fabricated ankle-foot orthosis (AFO) made of plastic or other material. As a custom orthotic, this code is used when a device is individually molded or constructed for a patient to provide support, stabilization, or correction of foot and ankle deformities. Nationally, L1940 is important for durable medical equipment (DME) policy, coverage determinations, and billing workflows because custom orthoses involve higher device and labor costs and typically require clinical justification and fitting services.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of what L1940 represents clinically, typical sites of service, and payer coverage context. The publication outlines benchmarks for utilization and reimbursement where available, summarizes relevant policy considerations affecting prior authorization and documentation requirements, and situates L1940 within the broader orthotics service line.
The content addresses clinical context for AFO use, billing and coding considerations specific to a custom-fabricated device, and common operational issues such as claims submission and unit reporting. Data not available in the input will be noted where applicable.
Billing Code Overview
HCPCS Level II code L1940 describes an ankle foot orthosis, plastic or other material, custom fabricated. This code represents a device individually fabricated to the patient’s anatomy to support, align, prevent, or correct deformities of the ankle and foot.
Service Type: Durable medical equipment / custom orthotic device
Typical Site of Service: Outpatient orthotics/prosthetics clinic, specialty orthopedic clinic, or hospital outpatient department
Clinical & Coding Specifications
Clinical Context
A typical patient is a 62-year-old with diabetic peripheral neuropathy and progressive forefoot deformity who presents to an orthotics clinic for evaluation of gait instability, recurrent plantar ulceration, or ankle instability. After a physician or certified orthotist/orthotic fitter documents a focused history and physical exam, weight-bearing and gait assessment are performed. Measurements and a plaster or digital cast of the affected lower extremity are obtained. A custom-fabricated ankle-foot orthosis (L1940) is manufactured to provide ankle-foot support, offload high-pressure areas, correct alignment, and improve functional mobility. The patient returns for fitting, adjustments, and education on donning, doffing, skin inspection, and progressive wear schedule. Follow-up visits assess fit, skin integrity, function, and need for repairs or replacement. Typical site of service is an outpatient orthotics/prosthetics clinic, physician office, or outpatient rehabilitation facility. Common payors include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, BUCA, and Medicare.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
LT | Left side | When the custom AFO is fabricated for the left lower extremity |