EXHIBIT 12
HCA INC.
COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES
FOR THE QUARTERS AND NINE MONTHS SEPTEMBER 30, 2002 AND 2001
(DOLLARS IN MILLIONS)
<Table>
<Caption>
QUARTER NINE MONTHS
----------- ---------------
2002 2001 2002 2001
---- ---- ------ ------
EARNINGS:
Income before minority interests and income taxes........... $369 $456 $1,653 $1,488
Fixed charges, excluding capitalized interest............... 139 164 425 501
---- ---- ------ ------
$508 $620 $2,078 $1,989
==== ==== ====== ======
FIXED CHARGES:
Interest charged to expense................................. $111 $137 $ 340 $ 418
Interest portion of rental expense and amortization of
deferred loan costs....................................... 28 27 85 83
---- ---- ------ ------
Fixed charges, excluding capitalized interest............... 139 164 425 501
Capitalized interest........................................ 9 5 22 12
---- ---- ------ ------
$148 $169 $ 447 $ 513
==== ==== ====== ======
Ratio of earnings to fixed charges.......................... 3.43 3.67 4.65 3.88
</Table>