Summary & Overview
HCPCS L1720: Legg Perthes Trilateral Orthosis, Custom Fabricated
HCPCS Level II code L1720 represents a custom-fabricated Legg Perthes orthosis, trilateral (Tachdijan type), used to stabilize and support the hip and adjacent structures in patients affected by Legg-Calvé-Perthes disease. The code identifies a specialized lower-extremity/hip orthotic intervention and is relevant for coverage determinations, durable medical equipment billing, and clinical care pathways for pediatric and adolescent orthopedic patients. Nationally, precise coding of custom orthoses matters for appropriate reimbursement, medical necessity review, and continuity of care across settings. Key payers in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of what the code denotes, common sites of service, and the scope of materials typically captured under this code. The publication covers benchmarks where available, payer coverage patterns, common billing modifiers, and clinical context to assist billing, compliance, and clinical staff in aligning documentation and coding practice. Data not available in the input is clearly noted where relevant.
Billing Code Overview
HCPCS Level II code L1720 denotes a Legg Perthes orthosis, trilateral, (Tachdijan type), custom fabricated. This code represents a custom-fabricated lower-extremity orthotic device designed to provide trilateral support for patients with hip-related instability or deformity associated with Legg-Calvé-Perthes disease.
Service type: custom-fabricated orthotic device (lower extremity/hip orthosis)
Typical site of service: orthotics/prosthetics clinic, specialty pediatric orthotics center, or outpatient durable medical equipment provider
Data not available in the input.
Clinical & Coding Specifications
Clinical Context
A pediatric patient, typically between ages 4 and 10, presents with hip pain and limited hip motion after progressive limp and intermittent thigh pain. Imaging (pelvic radiograph and MRI as indicated) confirms Legg-Calvé-Perthes disease with femoral head involvement and risk of femoral head deformation. The orthotist receives a prescription from the pediatric orthopedist for a custom-fabricated Legg Perthes orthosis, trilateral (Tachdjian type) to maintain femoral head containment, limit adduction and internal rotation, and allow weight-bearing as tolerated.
The clinical workflow: initial orthopedic evaluation with diagnostic imaging and measurement, prescription written for L1720, orthotic evaluation and casting or 3D scanning, fabrication of a custom trilateral orthosis in the orthotics lab, orthotist fitting and adjustments, patient/caregiver education on wearing schedule, follow-up visits for fit, skin checks, and periodic radiographs to monitor femoral head remodeling. Documentation includes medical necessity, prescription, measurements, fabrication details, fit report, and follow-up notes.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
26 | Professional component | When reporting the professional component of a related service (rare for durable orthoses) |