42 C.F.R. § 483.138
(a) Maintenance of services. If a NF mails a 30 day notice of its intent to transfer or discharge a resident, under § 483.15(b) of this chapter, the agency may not terminate or reduce services until—
(b) Availability of FFP. FFP is available for expenditures for services provided to Medicaid beneficiaries during—
[57 FR 56506, Nov. 30, 1992, as amended at 81 FR 68871, Oct. 4, 2016]