; and (II) administrative costs related to operating the public health insurance option. (B) Contingency margin In establishing premium rates under subparagraph (A), the Secretary shall include an appropriate amount for a contingency margin. (2) Account (A) Establishment There is established in the Treasury of the United States an account for the receipts and disbursements attributable to the operation of the public health insurance option, including the start-up funding under subparagraph (B). Section 1854(g) of the Social Security Act shall apply to receipts described in the previous sentence in the same manner as such section applies to payments or premiums described in such section. (B) Start-up funding (i) In general In order to provide for the establishment of the public health insurance option there is hereby appropriated to the Secretary, out of any funds in the Treasury not otherwise appropriated, $2,000,000,000. In order to provide for initial claims reserves before the collection of premiums, there is hereby appropriated to the Secretary, out of any funds in the Treasury not otherwise appropriated, such sums as necessary to cover 90 days worth of claims reserves based on projected enrollment. (ii) Amortization of start-up funding The Secretary shall provide for the repayment of the startup funding provided under clause (i) to the Treasury in an amortized manner over the 10-year period beginning with 2018. (iii) Limitation on funding Nothing in this subsection shall be construed as authorizing any additional appropriations to the account, other than such amounts as are otherwise provided with respect to other health benefits plans participating under the Exchange involved. (3) Insurance rating rules The premium rate charged for the public health insurance option may not vary except as provided under section 2701 of the Public Health Service Act. (c) Payment rates for items and services (1) Rates established by Secretary (A) In general The Secretary shall establish payment rates for the public health