42 C.F.R. § 409.47
To be covered, home health services must be furnished in either the beneficiary's home or an outpatient setting as defined in this section.
(b) Outpatient setting. For purposes of coverage of home health services, an outpatient setting may include a hospital, SNF or a rehabilitation center with which the HHA has an arrangement in accordance with the requirements of § 484.105(e) of this chapter and that is used by the HHA to provide services that either—
[59 FR 65496, Dec. 20, 1994, as amended at 82 FR 4578, Jan. 13, 2017]