HCPCS code L1810: Knee orthosis, prefabricated (customized)

Learn more about HCPCS code L1810 and how to properly use and bill it by meeting the documentation and billing requirements from our short guide.

Use Code

## **What is HCPCS code L1810?** HCPCS code L1810 describes a prefabricated knee orthosis (KO) or prefabricated knee brace constructed from elastic materials such as neoprene, spandex, or similar, and featuring hinge(s)/joints. Unlike off-the-shelf braces, L1810 indicates that the orthosis has been trimmed, bent, molded, assembled, or otherwise customized by a qualified expert to better fit the individual patient at delivery. These modifications extend beyond minimal self-adjustment and are performed by a professional to meet specific anatomical or functional needs. The device can serve as a rehabilitation knee brace after a surgical procedure, since it provides knee stabilization in cases of mild instability, weakness, or deformity, and even moderate knee ligament joint pain. It allows functional mobility while offering support and joint alignment.

## **HCPCS code L1810 documentation requirements** To ensure medical necessity and proper reimbursement, documentation for L1810 must include: - **Diagnosis and medical necessity**: The medical record must clearly state that the patient has a weakness or deformity of the knee that requires stabilization. This should be supported by a physician's history and physical, operative reports, or progress notes. - **Physical examination**: The patient's medical record must include a detailed physical examination with objective findings that justify the need for the brace. This can include descriptions of joint laxity, such as results from a varus/valgus instability or anterior/posterior drawer test. - **Justification for custom-fitted vs. off-the-shelf**: While L1810 is a prefabricated code, it's for a custom-fitted item. The documentation must support the need for the item to be "custom-fitted" by an expert, as opposed to an "off-the-shelf" item (like L1812), which requires only minimal self-adjustment. - **Written Order Prior to Delivery (WOPD)**: For many Durable Medical Equipment (DME) items, including some knee orthoses, a face-to-face encounter and a written order from the prescribing practitioner are required before the item is delivered. Check the specific payers and Medicare's up-to-date lists to confirm if this applies to L1810.

## **L1810 billing requirements** When billing L1810, one must meet the following coverage criteria: - **Modifiers**: Be sure to use the correct modifiers. For example, LT and RT modifiers are used to specify the left or right knee. Some payers may require a specific modifier to indicate that the item was "custom-fitted." - **Frequency limits**: There are often frequency limits on how often a brace can be billed for the same patient on the same anatomical site. A claim may be denied if it is submitted within the "reasonable useful lifetime" (RUL) of a previously paid, identical item. - **Billing a Custom-fabricated orthosis**: If a custom-fabricated orthosis is provided (e.g., L1840, L1846, or L1860), the medical record must specifically document why a prefabricated orthosis would not work, such as in cases of a significant deformity of the leg, a disproportionate limb size, or minimal muscle mass. - **Separate components**: Additional components or features (designated as "addition codes") can be billed separately if they are medically necessary and provided with the base orthosis.

## **Other relevant codes** Related HCPCS and orthotic codes include: - **L1812**: Knee orthosis (KO), elastic with joints, prefabricated, off-the-shelf - **L1820**: Knee orthosis, elastic with condylar pads and joints, with or without patellar control, prefabricated item that has been trimmed, bent, molded, assembled, or otherwise customized to fit a specific patient by an individual with expertise - **L1830**: Knee orthosis (KO), immobilizer, canvas longitudinal, prefabricated, off-the-shelf - **L1831**: Knee orthosis (KO), locking knee joint(s), positional orthosis, prefabricated, includes fitting and adjustment - **L1832**: Knee orthosis (KO), adjustable knee joints (unicentric or polycentric), positional orthosis, rigid support, prefabricated item that has been trimmed, bent, molded, assembled, or otherwise customized to fit a specific patient by an individual with expertise - **L1834**: Knee orthosis (KO), custom-fabricated knee immobilizer without joints - **L1836**: Rigid knee orthosis, without joint(s), includes soft interface material, prefabricated, off-the-shelf - **L1840**: Knee orthosis (KO), derotation, medial-lateral, anterior cruciate ligament, custom fabricated - **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 - **L1847**: Knee orthosis (KO), double upright with adjustable joint, with inflatable air support chamber(s), prefabricated item that has been trimmed, bent, molded, assembled, or otherwise customized to fit a specific patient by an individual with expertise

Frequently asked questions

Yes, L1810 is covered by Medicare under the braces benefit, provided that it is a rigid or semi-rigid device and documentation supports medical necessity. Coverage is subject to the specific requirements of the Local Coverage Determinations (LCDs) and related policy articles from Medicare's Durable Medical Equipment Medicare Administrative Contractors (DME MACs).

No, prior authorization is not required for HCPCS code L1810 under Medicare. However, coverage still depends on meeting all documentation and medical necessity criteria, and some Medicare Advantage or private insurers may impose their own authorization rules.

Documentation must show: ambulatory status; knee weakness or deformity; objective functional assessment; specifics of how the device was customized (e.g., trimming, molding); and include a signed SWO/WOPD prior to delivery.