(D)
Computing urban and rural averages.—
The Secretary shall compute an average of the standardized amounts determined under subparagraph (C) for the United States and for each region—
(i)
for all subsection (d) hospitals located in an urban area within the United States or that region, respectively, and
(ii)
for all subsection (d) hospitals located in a rural area within the United States or that region, respectively.
For purposes of this subsection, the term “region” means one of the nine census divisions, comprising the fifty States and the District of Columbia, established by the Bureau of the Census for statistical and reporting purposes; the term “urban area” means an area within a Metropolitan Statistical Area (as defined by the Office of Management and Budget) or within such similar area as the Secretary has recognized under subsection (a) of this section by regulation; the term “large urban area” means, with respect to a fiscal year, such an urban area which the Secretary determines (in the publications described in subsection (e)(5) of this section before the fiscal year) has a population of more than 1,000,000 (as determined by the Secretary based on the most recent available population data published by the Bureau of the Census); and the term “rural area” means any area outside such an area or similar area. A hospital located in a Metropolitan Statistical Area shall be deemed to be located in the region in which the largest number of the hospitals in the same Metropolitan Statistical Area are located, or, at the option of the Secretary, the region in which the majority of the inpatient discharges (with respect to which payments are made under this subchapter) from hospitals in the same Metropolitan Statistical Area are made.