HCPCS Code L1832: Knee Orthosis, Adjustable Knee Joints (Unicentric or Polycentric), Positional Orthosis, Rigid Support, Prefabricated

Learn about HCPCS Code L1832 knee orthosis, coverage, billing, and documentation for fractures and ligament injuries.

## **What is HCPCS code L1832?** HCPCS Code L1832 describes a prefabricated knee orthosis with adjustable knee joints (unicentric or polycentric), rigid support, and positional control. It is designed to stabilize the knee joint, reduce excessive motion, and support healing in patients with conditions such as ligament injuries, fractures, or meniscus tears. This prefabricated off-the-shelf orthosis can be trimmed, bent, molded, assembled, or otherwise customized by a healthcare professional to fit a specific patient. Unlike fully custom fabricated knee orthoses, L1832 is a prefabricated orthosis that requires substantial modification (e.g., trimming, bending, molding, or assembling) to fit a patient. It falls under DME and is used when patients require rigid support but do not meet the stricter requirements for a fully custom device. Note that full custom orthoses have separate HCPCS codes. Clinically, L1832 is often applied in cases of: - Initial encounter for closed fractures of the tibia, fibula, or femur. - Chronic or sequelae of meniscus injury or tear. - Sequela of fractures in the lower extremity requiring stabilization. - Ligament injuries (ACL, MCL, or collateral ligaments). The device typically includes thigh and calf cuffs connected by adjustable joints that control flexion and extension, providing medial-lateral and rotational stability. Joints provide flexion-extension control, medial-lateral stability, and sometimes rotational control depending on device design. Patients may also benefit from its low-profile design, rigid support, and adjustable immobilization features, making it a standard option for rehabilitation and mobility.

## **Documentation requirements** When billing HCPCS Code L1832, payers require clear, detailed documentation to show the orthosis is medically necessary and not simply for convenience. This code covers a prefabricated rigid knee orthosis with adjustable joints (unicentric or polycentric) that may be trimmed, bent, or molded to fit the patient. What needs to be documented: ### **Physician’s order** A written order from the physician must specifically request a rigid knee support under L1832. The order should describe why this device is needed for the patient’s condition. ### **Clinical justification** The patient’s diagnosis and clinical notes should support the need for a rigid orthosis. This includes conditions like: - Ligament injuries or instability - Closed fractures (initial encounter) - Meniscus tears or sequelae - Post-surgical stabilization The record should also explain why a simpler option, like an elastic sleeve or non-rigid brace, is not sufficient for this patient. ### **Proof of fitting and customization** Since L1832 is prefabricated but customizable, suppliers must keep records showing: - The orthosis was trimmed, bent, molded, or adjusted for the patient. - It was dispensed and fitted properly, with the date of service documented. ### **Supporting policies** Coverage is only approved if the orthosis is reasonable and necessary for the patient’s medical condition. Documentation should align with Medicare LCDs and DME checklists (e.g., Noridian and CMS guidance).

## **Billing requirements** For HCPCS Code L1832 (knee orthosis, adjustable knee joints, prefabricated, rigid support), billing is generally limited to one unit per brace. Providers must indicate the side by appending the appropriate modifier: RT for the right knee or LT for the left knee. When both knees require orthoses, submit two separate line items with RT and LT modifiers, respectively. Medicare typically reimburses the first brace at the full allowable rate and the second at 50%. Note that the combined modifier RTLT is not valid and should not be used. Coverage applies in settings such as outpatient clinics, DME suppliers, or the patient’s home when documentation supports medical necessity. Valid diagnoses include right femur initial encounter, fracture of the upper end, or left fibula sequela, as long as they show that the brace is required for stabilization. The device must provide support to the body and reduce reliance on minimal patient-directed adjustment; major modifications are outside the L1832 scope. Payers may deny claims if the orthosis is deemed for non-medical necessity coverage, such as for general comfort. To prevent this, providers must ensure all documentation aligns with payer limitations and or medical requirements.

## **Other relevant codes** - **L1833** – Knee orthosis (KO), adjustable knee joints (unicentric or polycentric), positional orthosis, rigid support, prefabricated, off-the shelf - **L1843** – Knee orthosis (KO), 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, prefabricated item that has been trimmed, bent, molded, assembled, or otherwise customized to fit a specific patient by an individual with expertise - **L1851** – Knee orthosis (ko), 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, prefabricated, off-the-shelf - **L1860** – Knee orthosis (KO), modification of supracondylar prosthetic socket, custom-fabricated (SK)

Frequently asked questions

L1832 is a prefabricated knee orthosis that requires substantial modification by a clinician or technician (e.g., trimming, bending, molding, or assembling) to properly fit the patient. By contrast, L1833 is off-the-shelf, requiring only minimal self-adjustment (such as tightening straps) and no significant modification by the supplier. Both may be used for conditions such as a right tibia initial encounter or closed fracture nondisplaced, but the choice depends on the patient’s medical needs.

Yes. Medicare generally covers L1832 when medical necessity is documented, such as for instability, ligament injuries, or fractures like a closed fracture displaced of the lower end or a right knee initial encounter. The documentation must demonstrate why a simpler device (e.g., elastic sleeve) is insufficient.

Yes, but correct modifiers are required. Use RT for the right side and LT for the left. If both knees are billed (e.g., when treating sequelae such as a left femur sequela), Medicare usually reimburses the second unit at 50% of the allowable.