42 C.F.R. § 435.406 : PUBLIC HEALTH — CENTERS FOR MEDICARE & MEDICAID SERVICES, DEPARTMENT OF HEALTH AND HUMAN SERVICES — MEDICAL ASSISTANCE PROGRAMS — ELIGIBILITY IN THE STATES, DISTRICT OF COLUMBIA, THE NORTHERN MARIANA ISLANDS, AND AMERICAN SAMOA — GENERAL ELIGIBILITY REQUIREMENTS — [Effective until 11/1/2024] Citizenship and noncitizen eligibility

(a) The agency must provide Medicaid to otherwise eligible individuals who are-
(1) Citizens and nationals of the United States, provided that-
(i) The individual has made a declaration of United States citizenship, as defined in § 435.4, or an individual described in paragraph (a)(3) of this section has made such declaration on the individual's behalf, and such status is verified in accordance with paragraph (c) of this section; and
(ii) For purposes of the declaration and citizenship verification requirements discussed in paragraphs (a)(1)(i) of this section, an individual includes applicants under a section 1115 demonstration (including a family planning demonstration project) for which a State receives Federal financial participation in its expenditures.
(iii) The following groups of individuals are exempt from the requirement to provide documentation to verify citizenship in paragraph (c) of this section:
(A) Individuals receiving SSI benefits under title XVI of the Act.
(B) Individuals entitled to or enrolled in any part of Medicare.
(C) Individuals receiving disability insurance benefits under section 223 of the Act or monthly benefits under section 202 of the Act, based on the individual's disability (as defined in section 223(d) of the Act).
(D) Individuals who are in foster care and who are assisted under Title IV-B of the Act, and individuals who are beneficiaries of foster care maintenance or adoption assistance payments under Title IV-E of the Act.
(E)
(1) Individuals who are or were deemed eligible for Medicaid in the State under § 435.117 or § 457.360 of this chapter on or after July 1, 2006, based on being born to a pregnant woman eligible under the State's Medicaid or CHIP state plan or waiver of such plan;
(2) At State option, individuals who were deemed eligible for coverage under § 435.117 or § 457.360 of this chapter in another State on or after July 1, 2006, provided that the agency verifies such deemed eligibility.
(2)
(i) Except as specified in 8 U.S.C. 1612(b)(1) (permitting States an option with respect to coverage of certain qualified noncitizens), qualified noncitizens as described in section 431 of the Personal Responsibility and Work Opportunity Reconciliation Act of 1996 ( 8 U.S.C. 1641) (including qualified noncitizens subject to the 5-year bar) who have provided satisfactory documentary evidence of qualified noncitizen status, which status has been verified with the Department of Homeland Security (DHS) under a declaration required by section 1137(d) of the Act that the applicant or beneficiary is an noncitizen in a satisfactory immigration status.
(ii) The eligibility of qualified noncitizens who are subject to the 5-year bar in 8 U.S.C. 1613 is limited to the benefits described in paragraph (b) of this section.
(3) For purposes of paragraphs (a)(1) and (2), of this section, a declaration of citizenship or satisfactory immigration status may be provided, in writing and under penalty of perjury, by an adult member of the individual's household, an authorized representative, as defined in § 435.923, or if the applicant is a minor or incapacitated, someone acting responsibly for the applicant provided that such individual attests to having knowledge of the individual's status.
(b) The agency must provide payment for the services described in § 440.255(c) of this chapter to residents of the State who otherwise meet the eligibility requirements of the State plan (except for receipt of AFDC, SSI, or State Supplementary payments) who are qualified noncitizens subject to the 5-year bar or who are non-qualified noncitizens who meet all Medicaid eligibility criteria, except non-qualified noncitizens need not present a social security number or document immigration status.
(c) The agency must verify the declaration of citizenship or satisfactory immigration status under paragraph (a)(1) or (2) of this section in accordance with § 435.956.

42 C.F.R. §435.406

55 FR 36819, Sept. 7, 1990, as amended at 56 FR 10807, Mar. 14, 1991; 71 FR 39222, July 12, 2006; 72 FR 38691, July 13, 2007; 81 FR 86454, Nov. 30, 2016
81 FR 86454, 1/20/2017