HCPCS Code L2397: Addition to Lower Extremity Orthosis, Suspension Sleeve

Code L2397 with confidence. Learn documentation, modifiers, and billing rules for suspension sleeves added to lower-extremity orthoses.

Use Code

## **What is a suspension sleeve?** L2397 describes a suspension sleeve supplied as an addition to a lower limb orthosis. A lower limb orthosis is an external device used for knee bracing, alignment, and load transfer across the leg. The sleeve is a tubular interface that grips the skin and the brace to resist migration, improve purchase, and keep hinges and shells aligned during gait. It is typically worn over the brace and extends across the knee with contact on the distal thigh and proximal calf. Suppliers fit sleeves to prefabricated knee orthoses and to a custom fabricated orthosis, including a custom fabricated knee orthosis or a rigid knee orthosis with adjustable knee joints. Some braces rely on locking knee joint designs, adjustable flexion, or an extension joint, and a sleeve helps maintain the set angles during motion. Certain platforms use thigh and calf pads, removable soft interface material, or an inflatable air bladder incorporated into the frame to fine-tune suspension. A sleeve also supports devices that shift load from a medial or lateral compartment, protect a repaired anterior cruciate ligament, stabilize a hyperextended knee, or control knee instability in users with minimal muscle mass or knee contractures. Orthotists may select sleeves for patients who require knee extension assist or for frames that assist knee joint extension, including designs based on a modified supracondylar prosthetic socket. All of these are billed through durable medical equipment suppliers when the sleeve is medically necessary for retention and function.

## **L2397 documentation requirements** Your records must show why the sleeve is needed in addition to the base brace and prove medical necessity. ### **Standard written order (SWO)** Obtain an SWO or WOPD issued before delivery. The order must name the base lower extremity orthosis and specify the suspension sleeve addition L2397. ### **Base device details** Identify the brace type and status. Note whether it is an off-the-shelf model, a custom fabricated knee immobilizer, a custom fabricated knee orthosis, or a rigid knee orthosis with adjustable knee joints. Include model, size, componentry, and any features such as locking knee joint, extension joint, or adjustable flexion. ### **Clinical justification** Document the problem the sleeve solves. Examples include brace migration, skin shear from straps, or loss of alignment during stance. Link the sleeve to functional goals such as control of knee instability, support for hyperextended knee, unloading a medial or lateral compartment, or stabilization after anterior cruciate ligament injury. Explain why a strap alone or a different interface would not suffice. ### **Patient presentation** Describe limb shape, minimal muscle mass, edema, scarring, or co-existing joint contracture that increase migration risk. Include photos or measurements when they clarify fit challenges. ### **Interface and materials** Record contact areas and materials used. Note the presence of removable soft interface material, thigh and calf pads, or an inflatable air bladder incorporated into the system when relevant to retention or skin protection. ### **Proof of delivery and supplier file** Keep signed proof of delivery and maintain a complete supplier record with SWO, medical notes, and invoices consistent with DMEPOS standards.

## **L2397 billing requirements** Bill L2397 only as an accessory linked to a covered base orthosis and follow payer-specific rules. ### **Add-on to a compatible base** Report L2397 as a separate line only when furnished with an authorized knee orthosis that requires a sleeve for function. Do not bill L2397 alone. ### **Laterality and quantity** Append the correct side and list one unit per limb supplied. If sleeves are provided for both legs, submit two lines with distinct laterality. ### **Coverage and medical policy** Confirm that the sleeve meets payer criteria for medical necessity. Many policies expect documentation of migration or alignment problems, failure of simpler strap solutions, or the need to enhance suspension for devices that assist knee joint extension or that unload a medial or lateral compartment. ### **Coordination with related additions** When the brace includes components such as locking knee joint, adjustable flexion, an extension joint, or a modified supracondylar prosthetic socket, ensure the accessory list on the claim matches the chart and the invoice. Mismatches trigger denials. ### **Replacement and wear** If the sleeve requires replacement due to wear or hygiene, document the cause, frequency of use, and expected service life. Note whether the base brace remains in service and continues to require the sleeve.

## **L2397 applicable modifiers** Use these modifiers when billing L2397. 1. **RT**: Right limb supplied. 1. **LT**: Left limb supplied. 1. **KX**: Requirements specified in medical policy met and supporting documentation is on file.

## **Other relevant codes** These HCPCS additions and knee-orthosis codes commonly appear with or near L2397. Verify active status and payer policy. - **L2395**: Offset knee joint, heavy-duty, each joint. - **L2405**: Addition to knee joint, drop lock, each. - **L1832**: Knee orthosis, rigid knee orthosis with adjustable knee joints, adjustable flexion and extension joint, prefabricated knee orthoses, requires fitting. - **L1833**: Knee orthosis, off-the-shelf, prefabricated knee orthoses with adjustable features, requires minimal fitting. - **L1845**: Custom-fabricated orthosis with adjustable knee joints, often for complex deformity or high stability needs.

Frequently asked questions

No. L2397 is an accessory. It is payable only when furnished in addition to a compatible lower extremity orthosis that is covered and in service. Submitting L2397 by itself results in denial.

Yes. A written order is required and it must specify both the base orthosis and the suspension sleeve. The record should state why the sleeve is needed to control migration, improve alignment, or protect skin.

Yes. Bill L2397 with the correct laterality modifier. Use RT for the right limb and LT for the left limb. The documentation must clearly identify the side supplied.