HCPCS Level II · Orthotic and prosthetic procedures and devices
L1851Knee 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
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Source: CMS HCPCS quarterly update, October 2026. Page updated September 29, 2026.
About L1851
L1851 is an HCPCS Level II code in the L series (orthotic and prosthetic procedures and devices), describing 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.
It was added to HCPCS effective 01/01/2017.
Its Medicare coverage code is "C", meaning coverage is left to the Medicare contractor's judgment.
Details
- Short description
- Ko single upright prefab ots
- Date added
- 01/01/2017
- Action effective
- 01/01/2017
- BETOS
- D1F
Related L18xx codes
- L1810Knee orthosis, elastic with joints, prefabricated item that has been trimmed, bent, molded, assembled, or otherwise customized to fit a specific patient by an individual with expertise
- L1812Knee orthosis, elastic with joints, prefabricated, off-the-shelf
- L1820Knee 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
- L1821Knee orthosis, elastic with condylar pads and joints, with or without patellar control, prefabricated, off the shelf
- L1830Knee orthosis, immobilizer, canvas longitudinal, prefabricated, off-the-shelf
- L1831Knee orthosis, locking knee joint(s), positional orthosis, prefabricated, includes fitting and adjustment
- L1832Knee orthosis, 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
- L1833Knee orthosis, adjustable knee joints (unicentric or polycentric), positional orthosis, rigid support, prefabricated, off-the shelf
- L1834Knee orthosis, without knee joint, rigid, custom fabricated
- L1836Knee orthosis, rigid, without joint(s), includes soft interface material, prefabricated, off-the-shelf
- L1840Knee orthosis, derotation, medial-lateral, anterior cruciate ligament, custom fabricated
- L1843Knee orthosis, 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
Common questions about L1851
Is HCPCS L1851 still valid?
- Yes. L1851 is active in the CMS October 2026 HCPCS file.
Does Medicare cover L1851?
- Its coverage code is "C": coverage is left to the Medicare contractor's judgment. Check the local coverage determination for your region.