EXHIBIT 12
HCA INC.
COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES
(UNAUDITED)
(DOLLARS IN MILLIONS)
<Table>
<Caption>
YEAR ENDED DECEMBER 31,
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2005 2004 2003 2002 2001
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EARNINGS:
Income before minority interests and income
taxes........................................... $2,327 $2,141 $2,306 $1,603 $1,596
Fixed charges, exclusive of capitalized
interest........................................ 785 686 611 558 647
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$3,112 $2,827 $2,917 $2,161 $2,243
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FIXED CHARGES:
Interest charged to expense....................... $ 655 $ 563 $ 491 $ 446 $ 536
Interest portion of rental expense................ 130 123 120 112 111
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Fixed charges, exclusive of capitalized
interest........................................ 785 686 611 558 647
Capitalized interest.............................. 25 28 49 37 15
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$ 810 $ 714 $ 660 $ 595 $ 662
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Ratio of earnings to fixed charges................ 3.84 3.96 4.42 3.63 3.39
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</Table>