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
HCPCS Level II code · L codes: Orthotic and Prosthetic Procedures and Devices
HCPCS codeL1851
- Long description
- 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
- Short description
- Ko single upright prefab ots
- Pricing indicator
38Orthotics, prosthetics, prosthetic devices & vision services- Medicare coverage
CCarrier judgment – coverage decided by the Medicare contractor- BETOS category
D1FProsthetic/Orthotic devices- Added
- January 1, 2017
- Last change
- January 1, 2017 – No change
Frequently asked questions
What is HCPCS code L1851?
L1851 is a HCPCS Level II code for 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.
Does Medicare cover L1851?
The HCPCS file lists coverage code C: Carrier judgment – coverage decided by the Medicare contractor. Coverage and payment also depend on local coverage determinations and the patient’s plan.
Nearby L codes
- L1840 – Knee orthosis, derotation, medial-lateral, anterior cruciate ligament, custom fabricated
- L1843 – Knee 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
- L1844 – Knee 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, custom fabricated
- L1845 – Knee orthosis, double 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
- L1846 – Knee orthosis, double upright, thigh and calf, with adjustable flexion and extension joint (unicentric or polycentric), medial-lateral and rotation control, with or without varus/valgus adjustment, custom fabricated
- L1847 – Knee orthosis, 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
- L1848 – Knee orthosis, double upright with adjustable joint, with inflatable air support chamber(s), prefabricated, off-the-shelf
- L1850 – Knee orthosis, swedish type, prefabricated, off-the-shelf
- L1852 – Knee orthosis (ko), double 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, modification of supracondylar prosthetic socket, custom fabricated (sk)
- L1900 – Ankle foot orthosis, spring wire, dorsiflexion assist calf band, custom fabricated
- L1902 – Ankle orthosis, ankle gauntlet or similar, with or without joints, prefabricated, off-the-shelf
- L1904 – Ankle orthosis, ankle gauntlet or similar, with or without joints, custom fabricated
- L1906 – Ankle foot orthosis, multiligamentous ankle support, prefabricated, off-the-shelf
- L1907 – Ankle orthosis, supramalleolar with straps, with or without interface/pads, custom fabricated
- L1910 – Ankle foot orthosis, posterior, single bar, clasp attachment to shoe counter, prefabricated, includes fitting and adjustment
Source: CMS HCPCS Level II quarterly file, October 2026. Reference only – check payer policy before billing.