42 C.F.R. § 124.2
As used in this subpart:
(e) Facility for long-term care means a facility (including a skilled nursing care or intermediate care facility), providing inpatient care for convalescent or chronic disease patients who require skilled nursing or intermediate care and related medical services:
(k) Outpatient medical facility means a facility, located in or apart from a hospital, for the diagnosis or diagnosis and treatment of ambulatory patients (including ambulatory inpatients):