42 CFR § 436.602 - Financial responsibility of relatives and other individuals.
(a) Subject to the provisions of paragraphs (b) and (c) of this section, in determining financial responsibility of relatives and other persons for individuals under Medicaid, the agency must use the following financial eligibility requirements and methodologies.
(1) Except for a spouse of an individual or a parent for a child who is under age 21 or blind or disabled, the agency must not consider income and resources of any relative as available to an individual.
(2) In relation to individuals under 21 (as described in section 1905(a)(i) of the Act), the financial responsibility requirements and methodologies include considering the income and resources of parents or spouses whose income and resources would be considered if the individual under age 21 were dependent under the State's approved AFDC plan, whether or not they are actually contributed. These requirements and methodologies must be applied in accordance with provisions of the State's approved AFDC plan.
(3) When a couple ceases to live together, the agency must count only the income and resources of the individual in determining his or her eligibility, beginning the first month following the month the couple ceases to live together.
(b) The agency may apply income and resource methodologies that are less restrictive than the cash assistance methodologies as specified in the State plan in accordance with § 436.601(d).