HCPCS Level II code L2020 describes a custom-fabricated knee-ankle-foot orthosis (KAFO) with double uprights, free ankle, solid stirrup, and thigh and calf bands/cuffs (double bar 'ak' orthosis); the service is the fabrication and provision of a custom KAFO used primarily for lower-extremity immobilization, support, or ambulation assistance, typically supplied in an outpatient prosthetics/orthotics clinic, orthotics specialty practice, or hospital inpatient/rehabilitation setting.