CPT code 0821T describes a concurrent, second physician or other qualified healthcare professional providing continuous, in‑person monitoring and intervention during a patient’s psychedelic medication therapy; this is an in-person, time-based monitoring service reported per hour and is typically provided in settings where psychedelic-assisted sessions occur such as ambulatory infusion centers, specialty clinics, or hospital outpatient departments.

For related coverage guidance, see recent payer policy updates: Lumbar Microdiscectomy, Artificial Cervical Intervertebral Disc, Lumbar Decompression.