42 C.F.R. § 436.1102
(b) If the agency elects to provide services to children during a period of presumptive eligibility, the agency must—
(2) Establish procedures to ensure that qualified entities—
(iv) For children determined to be presumptively eligible, notify the child's parent or caretaker at the time the determination is made, in writing and orally if appropriate, that—
(v) For children determined not to be presumptively eligible, notify the child's parent or caretaker at the time the determination is made, in writing and orally if appropriate—