42 C.F.R. § 415.152
As used in this subpart-
Approved graduate medical education (GME) program means one of the following:
Direct medical and surgical services means services to individual beneficiaries that are either personally furnished by a physician or furnished by a resident under the supervision of a physician in a teaching hospital making the cost election described in §§ 415.160 through 415.162 .
Nonprovider setting means a setting other than a hospital, skilled nursing facility, home health agency, or comprehensive outpatient rehabilitation facility in which residents furnish services. These include, but are not limited to, family practice or multispecialty clinics and physician offices.
Resident means one of the following:
Teaching hospital means a hospital engaged in an approved GME residency program in medicine, osteopathy, dentistry, or podiatry.
Teaching physician means a physician (other than another resident) who involves residents in the care of his or her patients.
Teaching setting means any provider, hospital-based provider, or nonprovider settings in which Medicare payment for the services of residents is made under the direct GME payment provisions of §§ 413.75 through 413.83 , or on a reasonable-cost basis under the provisions of § 409.26 or § 409.40(f) for resident services furnished in skilled nursing facilities or home health agencies, respectively.
42 C.F.R. §415.152