the associated chronic condition specified in such Appendix for the purpose of preventing the exacerbation of such chronic condition or the development of a secondary condition, including any amendment, addition, removal, or other modification made by the Secretary (pursuant to the authority granted to the Secretary under paragraph (2)(C)) to the items or services specified in such Appendix subsequent to the date of enactment of this subparagraph. . (b) Effective date The amendments made by this section shall apply to months in taxable years beginning after the date of enactment of this Act.