Summary & Overview
HCPCS L3913: Hand Finger Orthosis, Custom Fabricated
HCPCS Level II code L3913 represents a custom-fabricated hand finger orthosis without joints, including soft interface, straps, and the fitting and adjustment services. This orthotic code is used when a clinician or orthotics supplier provides a non-jointed, custom hand or finger support intended to stabilize or protect digits or the hand. Nationally, L3913 matters because hand and finger orthoses are common in rehabilitation, post-operative care, and chronic condition management where precise fit and function affect patient outcomes and utilization patterns.
Key payers covered in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find an overview of coding intent and clinical context, typical settings of service, common modifiers and billing considerations, and which payers commonly reimburse for custom-fabricated hand/finger orthoses. The publication summarizes benchmarking and payment policy themes, highlights documentation and fitting elements that typically accompany claims, and provides a concise view of how L3913 is applied across outpatient orthotics and rehabilitation services.
This piece is intended for billing managers, orthotics suppliers, rehabilitation clinicians, and policy analysts seeking a clear reference on the purpose and clinical use of HCPCS Level II code L3913 and the payer landscape relevant to custom hand/finger orthoses.
Billing Code Overview
HCPCS Level II code L3913 describes a hand finger orthosis, without joints. The device may include a soft interface and straps, is custom fabricated, and the code includes fitting and adjustment as part of the service.
Service type: Durable medical equipment / orthotic device fabrication and provision
Typical site of service: Outpatient clinics, orthotics/prosthetics provider offices, and outpatient rehabilitation settings
Clinical & Coding Specifications
Clinical Context
A 56-year-old right-hand-dominant patient presents to an outpatient orthotics clinic after surgical repair of extensor tendon lacerations to the ring and small fingers of the dominant hand. The surgeon orders a custom fabricated hand finger orthosis to immobilize the involved digits without joint hinges to protect the repaired tendons during early healing. The orthotist performs an initial evaluation, takes measurements and a positive cast or digital scan, fabricates a custom L3913 orthosis with a soft skin interface and adjustable straps, and completes fitting and adjustments at the same visit. The patient receives instruction on wear schedule, skin care, and signs of complications. Typical workflow: referral/order from surgeon or hand therapist → orthotist evaluation and measurement → custom fabrication (in-house or external lab) → fitting, adjustment, and documentation of services rendered using L3913 and applicable modifiers for laterality or unexpected circumstances → follow-up visits for progressive adjustments or replacement as healing advances.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
LT | Left side | When the orthosis is for the left hand or digits |