Knee orthosis, elastic with condylar pads and joints, with or without patellar

L1821 (“Knee orthosis, elastic with condylar pads and joints, with or without patellar”) is a code used to bill for equipment, supplies, drugs, or non-physician services in the HCPCS Level II code set. Whether it is billed — and whether a payer covers it — depends on the clinical setting, documentation, and plan rules.