of the Department or by contract or sharing agreement entered into pursuant to another provision of law and, if so, take action to do so. (B) (i) The Secretary shall review each Veterans Care Agreement of material size that has been in effect for at least six months within the first two years of its taking effect, and not less frequently than once every four years thereafter. (ii) If a Veterans Care Agreement has not been in effect for at least six months by the date of the review required by subparagraph (A), the agreement shall be reviewed during the next cycle required by subparagraph (A), and such review shall serve as its review within the first two years of its taking effect for purposes of clause (i). (3) (A) In fiscal year 2018 and in each fiscal year thereafter, in addition to such other Veterans Care Agreements as the Secretary may determine are of material size, a Veterans Care Agreement for the purchase of extended care services that exceeds $5,000,000 annually shall be considered of material size. (B) From time to time, the Secretary may publish a notice in the Federal Register to adjust the dollar amount specified in subparagraph (A) to account for changes in the cost of health care based upon recognized health care market surveys and other available data. (b) Eligible entities and providers For purposes of this section, an eligible entity or provider is— (1) any provider of services that has enrolled and entered into a provider agreement under section 1866(a) of the Social Security Act ( 42 U.S.C. 1395cc(a) ) and any physician or other supplier who has enrolled and entered into a participation agreement under section 1842(h) of such Act ( 42 U.S.C. 1395u(h) )