EXHIBIT 12
HCA INC.
COMPUTATION OF RATIO OF EARNINGS TO FIXED CHARGES
FOR THE QUARTERS AND SIX MONTHS JUNE 30, 2003 AND 2002
(DOLLARS IN MILLIONS)
<Table>
<Caption>
QUARTER SIX MONTHS
----------- ---------------
2003 2002 2003 2002
---- ---- ------ ------
EARNINGS:
Income before minority interests and income taxes........... $437 $623 $1,241 $1,284
Fixed charges, excluding capitalized interest............... 153 137 296 286
---- ---- ------ ------
$590 $760 $1,537 $1,570
==== ==== ====== ======
FIXED CHARGES:
Interest charged to expense................................. $123 $108 $ 237 $ 229
Interest portion of rental expense and amortization of
deferred loan costs....................................... 30 29 59 57
---- ---- ------ ------
Fixed charges, excluding capitalized interest............... 153 137 296 286
Capitalized interest........................................ 13 10 25 13
---- ---- ------ ------
$166 $147 $ 321 $ 299
==== ==== ====== ======
Ratio of earnings to fixed charges.......................... 3.55 5.17 4.79 5.25
</Table>