HCPCS Code L1951: Ankle Foot Orthosis, Spiral, (Institute of Rehabilitative Medicine Type)

HCPCS Code L1951 identifies a custom-fitted spiral ankle foot orthosis (AFO) modified for patient use, covered with prior authorization.

Use Code

## **What is HCPCS code L1951?** HCPCS code L1951 refers to an ankle foot orthosis (AFO), spiral type, specifically the "Institute of Rehabilitative Medicine" type, made from plastic or other material or other material that must meet CMS criteria for custom-fitting modifications and documented medical necessity. This code is used for a prefabricated item that has been customized by trimming, bending, molding, assembling, or otherwise adjusting to fit a particular patient by someone with expertise in orthotic fitting. The L1951 is distinct from custom-fabricated AFOs because it starts as a prefabricated orthosis that is then modified for the patient, which is important in documentation and billing. This code is essential for suppliers and providers to report the correct type of orthotic device used for patient care with Medicare coverage validation based on CMS guidelines.

## **HCPCS code L1951 documentation requirements** Medicare requires specific documentation to support medical necessity and reimbursement for HCPCS code L1951. Each component must be complete and accurate to avoid claim denials or audits. ### **Standard Written Order (SWO)** A valid SWO from the treating practitioner must be in place before the device is delivered. The order should include: - The patient’s full name or Medicare Beneficiary Identifier (MBI). - The date of the order. - A general description of the item (this can be “spiral ankle foot orthosis,” “HCPCS L1951,” or a narrative description). - The treating practitioner’s name or National Provider Identifier (NPI). - The practitioner’s handwritten or electronic signature. ### **Medical records** The treating practitioner’s notes must clearly justify the medical necessity of the orthosis. Records should document that the patient: - Is ambulatory. - Has weakness or deformity of the foot and ankle. - Requires stabilization for medical reasons. - Is expected to benefit functionally from the device. The records should also explain why a spiral AFO is appropriate for the patient’s condition, as opposed to other types of orthoses. ### **Proof of Delivery (POD)** The supplier must maintain signed proof that the device was delivered. The POD must: - Identify the delivery method (e.g., in-person handoff or shipment). - Include the delivery date. - Provide a detailed description of the item delivered, matching the order. - Be signed and dated by the beneficiary or an authorized designee. ### **Face-to-Face encounter and Written Order Prior to Delivery (WOPD)** Medicare requires a documented face-to-face encounter between the patient and treating practitioner to establish need. Following this visit, a WOPD must be completed before the orthosis is delivered. This ensures that the orthosis is prescribed based on direct clinical evaluation, not just supplier notes.

## **HCPCS code L1951 billing requirements** HCPCS code L1951 billing requirements per CMS and AAPC updated for 2025 emphasize the following points: 1. Required for L1951 for dates of service on or after August 12, 2024. Claims without prior authorization may be denied. 1. Appropriate use of RT (right) or LT (left) modifiers when applicable is mandatory for claims. 1. Claims must comply with Medicare DMEPOS standards and local coverage determinations (LCD) related to ankle-foot orthoses.

## **Other relevant codes** Relevant HCPCS codes to HCPCS code L1951 (prefabricated ankle foot orthosis, spiral, custom-fitted) include the following with accurate descriptions: - **L1950**: Ankle foot orthosis (AFO), spiral, (institute of rehabilitative medicine type), plastic, custom-fabricated - **L1952**: Ankle foot orthosis, spiral, (institute of rehabilitative medicine type), plastic or other material, prefabricated, off-the-shelf - **L1900**: Ankle foot orthosis (AFO), spring wire, dorsiflexion assist calf band, custom-fabricated - **L1932**: Ankle foot orthosis, rigid anterior tibial section, total carbon fiber or equal material, prefabricated item that has been trimmed and fitted - **L2000**: Knee ankle foot orthosis (KAFO), single upright, free knee, free ankle, solid stirrup, thigh and calf bands/cuffs (single bar 'AK' orthosis), custom-fabricated

Frequently asked questions

HCPCS code L1951 is for a spiral ankle foot orthosis (AFO) of the Institute of Rehabilitative Medicine type. It is a prefabricated plastic or other material device that has been trimmed, bent, molded, or otherwise customized to fit a specific patient by an expert. This custom-fitted orthosis provides support and controlled movement for the ankle and foot.

Medicare covers HCPCS code L1951 for dates of service on or after August 12, 2024, with prior authorization required. Coverage includes custom-fitted spiral ankle foot orthoses that are prefabricated and modified to fit the patient. Proper documentation and medical necessity must be met for reimbursement.

Ankle Foot Orthoses (AFOs) are generally covered by insurance, including Medicare, when medically necessary and prescribed by a healthcare provider. Coverage requires documentation of medical need, proper prescription, and sometimes prior authorization. Coverage varies by insurer and policy but is common for treating weakness or deformity in the lower limb.