; and (2) by striking subparagraphs (B) and (C) and inserting subparagraph (B) and subparagraph (C) or paragraph (9) (as applicable) . (c) Effective date The amendments made by this section shall apply with respect to applications for child’s insurance benefits filed in calendar year 2020, except that such amendments shall not apply for purposes of determining continuing eligibility for child’s insurance benefits for any month after such calendar year. 9. Holding SSI, Medicaid, and CHIP beneficiaries harmless For purposes of determining the income of an individual to establish eligibility for, and the amount of, benefits payable under title XVI of the Social Security Act, eligibility for medical assistance under the State plan under title XIX (or a waiver of such plan), or eligibility for child health assistance under the State child health plan under title XXI (or a waiver of the plan), the amount of any benefit to which the individual is entitled under title II of such Act shall be deemed not to exceed the amount of the benefit that would be determined for such individual under such title as in effect on the day before the date of the enactment of this Act. 10. Expedited adjustment of underpayments In any case in which, as a result of a provision of this Act or an amendment made by this Act, the Commissioner determines that an underpayment of benefits has occurred, the Commissioner shall pay the balance of the amount due as soon as practicable after the date of enactment of this Act. 11. Appropriation of funds There are appropriated from the general fund of the Treasury to the Federal Old-Age and Survivors Insurance Trust Fund and the Federal Disability Insurance Trust Fund such sums as necessary to pay for the benefit increases attributable to the this Act and the amendments made by such Act.