; coverage The Secretary shall establish enrollment periods and coverage under this section consistent with the principles for establishment of enrollment periods and coverage for individuals under other provisions of this title. The Secretary shall establish such periods so that coverage under this section shall first begin on January 1, 2019. (c) Premium (1) Amount of monthly premiums The Secretary shall, during September of each year (beginning with 2018), determine a monthly premium for all individuals enrolled under this section. Such monthly premium shall be equal to 1/12 of the annual premium computed under paragraph (2)(B), which shall apply with respect to coverage provided under this section for any month in the succeeding year. (2) Annual premium (A) Combined per capita average for all Medicare benefits The Secretary shall estimate the average, annual per capita amount for benefits and administrative expenses that will be payable under parts A, B, and D (including, as applicable, under part C) in the year for all individuals enrolled under this section. (B) Annual premium The annual premium under this subsection for months in a year is equal to the average, annual per capita amount estimated under subparagraph (A) for the year. (3) Increased premium for certain part C and D plans Nothing in this section shall preclude an individual from choosing a Medicare Advantage plan or a prescription drug plan which requires the individual to pay an additional amount (because of supplemental benefits or because it is a more expensive plan). In such case the individual would be responsible for the increased monthly premium. (d) Payment of premiums (1) In general Premiums for enrollment under this section shall be paid to the Secretary at such times, and in such manner, as the Secretary determines appropriate. (2) Deposit Amounts collected by the Secretary under this section shall be deposited in the Federal Hospital Insurance Trust Fund and the Federal Supplementary Medical Insurance Trust Fund (including the