Identity Theft Prevention Act of 2003

Identity Theft Prevention Act of 2003 - Amends title II (Old Age, Survivors and Disability Insurance) of the Social Security Act and the Internal Revenue Code to prohibit using a social security account number for various purposes, except for specified social security and tax purposes. Prohibits the Social Security Administration from divulging the social security account number issued to any individual to any agency or instrumentality of the Federal Government, to any State, political subdivision of a State, or agency or instrumentality of a State or political subdivision thereof, or to any other individual.

Amends the Privacy Act of 1974 to prohibit any Federal, State, or local government agency or instrumentality from requesting an individual to disclose his social security account number on either a mandatory or a voluntary basis.

Prohibits: (1) any two Federal agencies or instrumentalities from implementing the same identifying number with respect to any individual (except as authorized by specified Federal law); or (2) any Federal agency from establishing or mandating a uniform standard for identification of an individual that is required to be used by any other Federal agency, a State agency, or a private person for any purpose other than the purpose of conducting the authorized activities of the Federal agency establishing or mandating the standard, or conditioning receipt of any Federal grant or contract or other Federal funding on the adoption, by a State, a State agency, or a political subdivision of a State, of a uniform standard for identification of an individual.