A knee immobilizer without joints (L1830), or a knee orthosis with adjustable knee joints (L1832, L1833), or a knee orthosis, with an adjustable flexion and extension joint that provides both medial-lateral and rotation control (L1843, L1845), are covered if the beneficiary has had recent injury to or a surgical procedure on the knee(s) and has one of the diagnoses listed in the ICD-9 Diagnosis Codes That Support Medical Necessity Group 2 Codes section. To read the entire revision please click REVISED LCD KNEE