Effective July 1, 2021, HCPCS Code G2213: Initiation of medication to treat Opioid Use Disorder (OUD) in the emergency department setting, including assessment, referral to ongoing care, and arranging access to supportive services is covered when billed with a primary Current Procedural Terminology (CPT) Code.99281, 99282, 99283, 99284, OR 99285.