An anesthesiologist
A doctor of medicine or osteopathy other than an anesthesiologist
A doctor of dental surgery or dental medicine
A doctor of podiatric medicine
A certified registered nurse anesthetist (CRNA) supervised by the operating practitioner except as provided in 42 CFR 482.52(c) regarding the state exemption for this supervision
An anesthesiologist’s assistant supervised by an anesthesiologist who is immediately available if needed
A supervised trainee in an approved educational program