Health Deductible Insurance Fairness Act of 2003 - Amends the Public Health Service Act to provide that if a health insurance issuer offering group or individual health insurance coverage imposes an annual deductible with respect to an individual and the individual changes during a year to another of such issuer's coverages that also imposes an annual deductible, the issuer shall credit toward the deductible for the latter coverage amounts that were credited toward the deductible under the former coverage.