HCPCS Code L3924: Hand Finger Orthosis (HFO), Without Joints, May Include Soft Interface, Straps, Prefabricated, Off-the-shelf

## **L3924 documentation requirements** Proper documentation is essential for ensuring Medicare coverage. Records must demonstrate why the orthosis was needed, how it was used, and how it benefits the patient. ### **Medical necessity** Providers must clearly document the medical need for the orthosis. This typically includes a diagnosis of a soft tissue injury, fracture, or instability in the hand, thumb, metacarpophalangeal joint, or wrist. The documentation should show that without the device, the patient risks further injury, pain, or functional limitations. ### **Device details** The record must specify that the orthosis is without joints, meaning it does not include mechanical or adjustable articulations. It must also be identified as prefabricated and off-the-shelf, distinguishing it from custom-fabricated orthoses. ### **Fitting and adjustment** Even though the orthosis is off-the-shelf, suppliers must document how the device was fitted and adjusted for the patient. This could include notes on the use of straps, soft interfaces, or hook-and-loop closures to ensure proper positioning, comfort, and stability. ### **Functional need** Documentation should explain how the orthosis supports the patient’s functional recovery. For example, the device may protect the thumb and fingers during healing, stabilize the wrist to prevent reinjury, or help the patient perform daily tasks safely while recovering from trauma. ### **Compliance requirements** Suppliers must ensure all records comply with the Medicare Program Integrity Manual and meet the standards set by Durable Medical Equipment Medicare Administrative Contractors (DME MACs), as claims are often reviewed for accuracy and completeness.

## **L3924 billing guidelines** Accurate billing for L3924 requires suppliers to understand how the code is defined, when it is covered, and what responsibilities they hold when providing the orthosis. Claims must be backed by the documentation outlined above and submitted according to Medicare’s standards. ### **Supplier responsibility** Suppliers are responsible for providing the orthosis, performing any necessary adjustments, and ensuring that the device fits securely and comfortably. They must also keep records of the fitting process and delivery of the device to the patient. ### **Medicare coverage** Medicare may cover L3924 when documentation demonstrates medical necessity. Coverage decisions are subject to review by DME MACs, and suppliers should be prepared for potential audits. Claims must align with the requirements of the Medicare Program Integrity Manual. ### **Replacement and service** Billing for L3924 is appropriate only when the orthosis is supplied along with the necessary fitting and adjustment services. Replacement is allowed when the device is lost, stolen, or damaged beyond repair, but justification must be included in the claim. ### **Modifiers** The CG modifier (policy criteria applied) is required when billing L3924 to demonstrate compliance with Medicare coverage guidelines. Using the correct modifiers helps ensure accurate claim processing and reduces the risk of denials. Other common modifiers include: - **LT** – Item is for the left hand - **RT** – Item is for the right hand - **KX** – Documentation on file meets medical necessity requirements - **GY** – Item or service statutorily excluded or not a Medicare benefit - **GZ** – Item or service expected to be denied as not reasonable or necessary These modifiers ensure accurate claim processing and help avoid unnecessary denials or payment delays.

## **Other related HCPCS codes** - **L3923** – Hand finger orthosis (HFO), without joints, may include soft interface, straps, prefabricated item that has been trimmed, bent, molded, assembled, or otherwise customized to fit a specific patient by an individual with expertise - **L3809** – Wrist hand finger orthosis (WHFO), without joint(s), prefabricated, off-the-shelf, any type - **L3933** – Finger orthosis (FO), without joints, may include soft interface, custom fabricated, includes fitting and adjustment