42 C.F.R. § 435.115
Families with Medicaid eligibility extended because of increased collection of spousal support
(a) Basis. This section implements sections 408(a)(11)(B) and 1931(c)(1) of the Act.
(b) Eligibility. (1) The extended eligibility period is for 4 months.
(2) The agency must provide coverage during an extended eligibility period to a parent or other caretaker relative who was eligible and enrolled for Medicaid under § 435.110, and any dependent child of such parent or other caretaker relative who was eligible and enrolled under § 435.118, in at least 3 out of the 6 months immediately preceding the month that eligibility for the parent or other caretaker relative under § 435.110 is lost due to increased collection of spousal support under title IV-D of the Act.