David Jayne Medicare Homebound Modernization Act of 2003

David Jayne Medicare Homebound Modernization Act of 2003 - Amends title XVIII (Medicare) of the Social Security Act with respect to the definition of homebound for purposes of determining Medicare eligibility for home health services. Prohibits the Secretary of Health and Human Services from disqualifying from consideration as confined to the home, based on the purpose, frequency, or duration of the absences from the home, any individual who: (1) has been certified by a physician as having a permanent and severe condition that will not improve which requires the individual to receive assistance from another individual with at least three out of five activities of daily living for the rest of the individual's life; and (2) requires one or more described home health services to achieve a functional condition giving the individual the ability to leave the home.