Audiology Patient Choice Act of 2018 This bill amends expands the definition of "physician," for purposes of the Medicare program, to include an audiologist with respect to the furnishing of audiology services. Additionally, the bill expands the scope of audiology services covered under Medicare and allows payment for such services regardless of whether an enrollee is under the care of (or referred by) a physician or other health care provider or whether the services are provided under the supervision of a physician or other health care provider.