In establishing any fee schedule under this subsection, the Secretary may provide for an adjustment to take into account, with respect to the portion of the expenses of clinical diagnostic laboratory tests attributable to wages, the relative difference between a region’s or local area’s wage rates and the wage rate presumed in the data on which the schedule is based.

For purposes of subsections (a)(1)(D)(i) and (a)(2)(D)(i), the limitation amount for a clinical diagnostic laboratory test performed—

(i) on or after July 1, 1986 , and before April 1, 1988 , is equal to 115 percent of the median of all the fee schedules established for that test for that laboratory setting under paragraph (1),

(ii) after March 31, 1988 , and before January 1, 1990 , is equal to the median of all the fee schedules established for that test for that laboratory setting under paragraph (1),

(iii) after December 31, 1989 , and before January 1, 1991 , is equal to 93 percent of the median of all the fee schedules established for that test for that laboratory setting under paragraph (1),

(iv) after December 31, 1990 , and before January 1, 1994 , is equal to 88 percent of such median,

(v) after December 31, 1993 , and before January 1, 1995 , is equal to 84 percent of such median,

(vi) after December 31, 1994 , and before January 1, 1996 , is equal to 80 percent of such median,

(vii) after December 31, 1995 , and before January 1, 1998 , is equal to 76 percent of such median, and

(viii) after December 31, 1997 , is equal to 74 percent of such median (or 100 percent of such median in the case of a clinical diagnostic laboratory test performed on or after January 1, 2001 , that the Secretary determines is a new test for which no limitation amount has previously been established under this subparagraph).