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97 STAT. 170 PUBLIC LAW 98-21—APR. 20, 1983 applicable for individuals enrolled under this part for the succeeding calendar year. The monthly premium shall (except as otherwise provided in subsection (e)) be equal to the smaller of— "(A) the monthly actuarial rate for enrollees age 65 and over, determined according to paragraph (1) of this subsection, for that calendar year, or "(B) the monthly premium rate most recently promulgated by the Secretary under this paragraph, increased by a percentage determined as follows: The Secretary shall ascertain the pri- 42 use 415. mary insurance amount computed under section 215(a)(1), based upon average indexed monthly earnings of $900, that applied to individuals who became eligible for and entitled to old-age insurance benefits on November 1 of the year before the year of the promulgation. He shall increase the monthly premium rate by the same percentage by which that primary insurance amount is increased when, by reason of the law in effect at the time the promulgation is made, it is so computed to apply to those individuals for the following November 1. Whenever the Secretary promulgates the dollar amount which shall be applicable as the monthly premium for any period, he shall, at the time such promulgation is announced, issue a public statement setting forth the actuarial assumptions and bases employed by him in arriving at the amount of an adequate actuarial rate for enrollees age 65 and older as provided in paragraph (1) and the derivation of the dollar amounts specified in this paragraph. "(4) The Secretary shall also, during September of 1983 and of each year thereafter, determine the monthly actuarial rate for disabled enrollees under age 65 which shall be applicable for the succeeding calendar year. Such actuarial rate shall be the amount the Secretary estimates to be necessary so that the aggregate amount for such calendar year with respect to disabled enrollees under age 65 which will equal one-half of the total of the benefits and administrative costs which he estimates will be payable from the Federal Supplementary Medical Insurance Trust Fund for serv- ices performed and related administrative costs incurred in such calendar year with respect to such enrollees. In calculating the monthly actuarial rate under this paragraph, the Secretary shall include an appropriate amount for a contingency margin.". 42 use I395r. (2) Subsections (d), (e), (f), and (g) of section 1839 of such Act are redesignated as subsections Ot)), (c), (d), and (e), respectively. (3)(A) Section 1839(b) of such Act (as so redesignated) is amended by striking out "subsection (b), (c), or (g)" and inserting in lieu thereof "subsection (a) or (e)". (B) Section 1839(d) of such Act (as so redesignated) is amended by striking out "purposes of subsection (c)" and inserting in lieu thereof "purposes of subsection 0))"- (C) Section 1839(e) of such Act (as so redesignated) is amended— (i) by striking out "(c)", "(c)(1)", and "(c)(3)" and inserting in lieu thereof "(a)", "(a)(1)", and "(a)(3)", respectively, (ii) by striking out "June 1983" in paragraph (1) and inserting in lieu thereof "December 1983", and (iii) by striking out "July 1985" and inserting in lieu thereof "January 1986" each place it appears. 42 use i395i-2. (D) Section 1818(c) of such Act is amended by striking out "subsec- tion (c) of section 1839" and inserting in lieu thereof "subsection (a) of section 1839".